Application "Dynamics of semiconductor lasers"

I. Laukaityte, R. Čiegis, M. Lichtner, M. Radziunas, Parallel Numerical Algorithm for the Traveling Wave Model, in: Parallel Scientific Computing and Optimization: Advances and Applications, R. Čiegis, D. Henty, B. Kågström, J. Žilinskas, eds., 27 of Springer Optimization and Its Applications, Springer, New York, 2008, pp. 237-251, (chapter published).

M. Radziunas, H.-J. Wünsche, Chapter 5: Multisection Lasers: Longitudinal Modes and Their Dynamics, in: Optoelectronic Devices --- Advanced Simulation and Analysis, J. Piprek, ed., Springer, New York, 2005, pp. 121--150, (chapter published).

U. Bandelow, H. Gajewski, R. Hünlich, Chapter 3: Fabry--Perot Lasers: Thermodynamics-based Modeling, in: Optoelectronic Devices --- Advanced Simulation and Analysis, J. Piprek, ed., Springer, New York, 2005, pp. 63-85, (chapter published).

H.-J. Wünsche, J. Piprek, U. Bandelow, H. Wenzel, eds., Proceedings of the 5th International Conference on ``Numerical Simulation of Optoelectronic Devices'' (NUSOD '05) in Berlin, September 19--22, 2005, IEEE, Piscataway, NJ, 2005, 134 pages, (conference published).

A. Pérez-Serrano, J. Javaloyes, S. Balle, Multi-channel wavelength conversion using four-wave mixing in semiconductor ring lasers, IEEE Phot. Tech. Letter, 25 (2013) pp. 476--479.
Abstract

We theoretically study all-optical simultaneous wavelength conversion of multiple channels by four-wave mixing in semiconductor ring lasers. Locking the semiconductor ring laser to a holding beam allows to achieve large conversion efficiencies with good signal-tonoise ratio in several channels at multi-Gb/s bit rates. Cross-talk between signals, arising from the peculiar four-wave mixing cascade of modes in semiconductor ring lasers and their cross-gain saturation, is studied in detail. We show that it can be controlled by adjusting the intensity of the holding beam, the bias current of the laser and the number, intensity and wavelength of signals that one wants to convert.

A. Wilms, D. Breddermann, P. Mathé, Theory of direct capture from two- and three-dimensional reservoirs to quantum dot states, Phys. Status Solidi C, 9 (2012) pp. 1278--1281.

T. Habruseva, S.P. Hegarty, A.G. Vladimirov, A. Pimenov, D. Rachinskii, N. Rebrova, E.A. Viktorov, G. Huyet, Bistable regimes in an optically injected mode-locked laser, Opt. Express, 20 (2012) pp. 25572--25583.

M. Lichtner, V.Z. Tronciu, A.G. Vladimirov, Theoretical investigations of striped and non-striped broad area lasers with off-axis feedback, IEEE J. Quantum Electron., 48 (2012) pp. 353--360.

M. Tlidi, E. Averlant, A.G. Vladimirov, K. Panajotov, Delay feedback induces a spontaneous motion of two-dimensional cavity solitons in driven semiconductor microcavities, Phys. Rev. A, 86 (2012) pp. 033822/1--033822/8.

D. Turaev, A.G. Vladimirov, S. Zelik, Long range interaction and synchronization of oscillating dissipative solitons, Phys. Rev. Lett., 108 (2012) pp. 263906/1--263906/5.

M. Radziunas, A.G. Vladimirov, E.A. Viktorov, G. Fiol, H. Schmeckebier, D. Bimberg, Broadening of mode-locking pulses in quantum-dot semiconductor lasers: Simulation, analysis and experiments, IEEE J. Quantum Electron., 47(7) (2011) pp. 935-943.
Abstract

We consider a mode-locked quantum-dot edge-emitting semiconductor laser consisting of a reverse biased saturable absorber and a forward biased amplifying section. To describe the dynamics of this laser we use the traveling wave model taking into account carrier exchange processes between a reservoir and the quantum dots. A comprehensive parameter study is presented and an analysis of mode-locking pulse broadening with an increase of injection current is performed. The results of our theoretical analysis are supported by experimental data demonstrating a strong pulse asymmetry in a monolithic two section quantum dot mode-locked laser.

M. Radziunas, A.G. Vladimirov, E.A. Viktorov, G. Fiol, H. Schmeckebier, D. Bimberg, Strong asymmetry of mode-locking pulses in quantum-dot semiconductor lasers, Appl. Phys. Lett., 98 (2011) pp. 031104.
Abstract

We describe the formation of a strong pulse asymmetry in mode-locked quantum-dot edge-emitting two-section semiconductor lasers. A mode decomposition technique reveals the role of the superposition of different modal groups. The results of theoretical analysis are supported by experimental data.

M. Radziunas, A.G. Vladimirov, E.A. Viktorov, G. Fiol, H. Schmeckebier, D. Bimberg, Pulse broadening in quantum-dot mode-locked semiconductor lasers: Simulation, analysis and experiments, IEEE J. Quantum Electron., (2011) pp. 935-943.
Abstract

We consider a mode-locked quantum-dot edge-emitting semiconductor laser consisting of a reverse biased saturable absorber and a forward biased amplifying section. To describe the dynamics of this laser we use the traveling wave model taking into account carrier exchange processes between a reservoir and the quantum dots. A comprehensive parameter study is presented and an analysis of mode-locking pulse broadening with an increase of injection current is performed. The results of our theoretical analysis are supported by experimental data demonstrating a strong pulse asymmetry in a monolithic two section quantum dot mode-locked laser.

M. Radziunas, K.-H. Hasler, B. Sumpf, T.Q. Tien, H. Wenzel, Mode transitions in DBR semiconductor lasers: Experiments, mode analysis and simulations, J. Phys. B, 44 (2011) pp. 105401/1--105401/8.
Abstract

The performance of a multisection DBR semiconductor laser emitting around 1060 nm is experimentally and theoretically investigated. Simulations and mode analysis of the traveling wave model including temperature induced changes of the refractive index explain experimentally observed nearly-periodic transitions between neighboring cavity mode determined continuous wave states with increasing injection current.

I. Babushkin, U. Bandelow, A. Vladimirov, Rotational symmetry breaking in small-area circular vertical cavity surface emitting lasers, Opt. Commun., 284 (2011) pp. 1299--1302.
Abstract

We investigate theoretically the dynamics of three low-order transverse modes in a small-area vertical cavity surface emitting laser. We demonstrate the breaking of axial symmetry of the transverse field distribution in such a device. In particular, we show that if the linewidth enhancement factor is sufficiently large dynamical regimes with broken axial symmetry can exist up to very high diffusion coefficients  10 um^2/ns.

J.-E. Kim, M.-R. Dachner, A. Wilms, M. Richter, E. Malic, Microscopic study of relaxation oscillations in quantum-dot VCSELs, Photon. Nanostruct. Fund. Appl., 9 (2011) pp. 337-344.

N. Rebrova, G. Huyet, D. Rachinskii, A.G. Vladimirov, Optically injected mode-locked laser, Phys. Rev. E (3), 83 (2011) pp. 066202/1-066202/8.

M. Radziunas, K. Staliunas, Spatial ``rocking'' in broad-area semiconductor lasers, Europhys. Lett., 95 (2011) pp. 14002/1--14002/6.
Abstract

The spatial ``rocking'' is a dynamical effect converting a phase-invariant oscillatory system into a phase-bistable one, where the average phase of the system locks to one of two values differing by $pi$. We demonstrate theoretically the spatial rocking in experimentally accessible and practically relevant systems -- the broad area semiconductor lasers. By numerical integration of the laser model equations we show the phase bistability of the optical fields and explore the bistability area in parameter space. We also predict the spatial patterns, such as phase domain walls and phase solitons, which are characteristic for the phase-bistable spatially extended pattern forming systems.

V.Z. Tronciu, C. Mirasso, P. Colet, M. Hamacher, M. Benedetti, V. Vercesi, V. Annovazzi-Lodi, Chaos generation and synchronization using an integrated source with an air gap, IEEE J. Quantum Electron., 46 (2010) pp. 1840--1846.

V.Z. Tronciu, Chaos communication using semiconductor lasers subject to different kinds of optical feedback, Moldavian J. Phys. Sci., 9 (2010) pp. 50-69.

A.G. Vladimirov, U. Bandelow, G. Fiol, D. Arsenijević, M. Kleinert, D. Bimberg, A. Pimenov, D. Rachinskii, Dynamical regimes in a monolithic passively mode-locked quantum dot laser, J. Opt. Soc. Amer. B Opt. Phys., 27 (2010) pp. 2102-2109.

R. Čiegis, M. Radziunas, Effective numerical integration of traveling wave model for edge-emitting broad-area semiconductor lasers and amplifiers, Math. Model. Anal., 15 (2010) pp. 409--430.
Abstract

We consider a system of 1+2 dimensional partial differential equations which describes dynamics of edge-emitting broad area semiconductor lasers and amplifiers. The given problem is defined on the unbounded domain. After truncating this domain and defining an auxiliary $1+1$ dimensional linear Schrodinger problem supplemented with different artificial boundary conditions, we propose an effective strategy allowing to get a solution of the full problem with a satisfactory precision in a reasonable time. For further speed up of the numerical integration, we develop a parallel version of the algorithm

M.-R. Dachner, E. Malic, M. Richter, A. Carmele, J. Kabuss, A. Wilms, J.-E. Kim, G. Hartmann, J. Wolters, U. Bandelow, A. Knorr, Theory of carrier and photon dynamics in quantum dot light emitters, Phys. Status Solidi B, 247 (2010) pp. 809--828.
Abstract

We present a microscopic theory describing the charge carrier and light emission dynamics in quantum dot (QD) light emitters. The theory covers non-classical light emission (fluorescence and Raman emission) in the low carrier injection limit as well as laser emission and pulse amplification in the high carrier injection limit. The theoretical approach is based on QD Bloch equations including microscopically calculated Coulomb and electron-phonon scattering rates between bound QD, continuous wetting layer (WL) and bulk states. In the low carrier density limit, multi-phonon relaxation is the dominant process, while at high charge carrier densities, Coulomb scattering dominates the dynamics. Using an equation of motion approach, we address (i) time-resolved fluorescence and Raman emission, (ii) electrical injection and charge carrier transfer from bulk into WL and QD states, (iii) single photon emission and (iv) gain dynamics of QD amplifiers and lasing dynamics in QD vertical-cavity surface-emitting lasers (VCSELs) at high injection currents.

CH. Fiebig, V.Z. Tronciu, M. Lichtner, H. Wenzel, K. Paschke, Experimental and numerical study of distributed Bragg reflector tapered lasers, Appl. Phys. B, 99 (2010) pp. 209--214.
Abstract

We report results on experimental and numerical investigations of the output characteristics of edge-emitting distributed Bragg reflector tapered diode lasers emitting around 980 nm. The experimental results are well described by the Traveling Wave model which is extended by a parametrical heating model. Dynamic instabilities occur due to different thermally induced refractive index changes.

G. Fiol, D. Arsenijević, D. Bimberg, A.G. Vladimirov, M. Wolfrum, E.A. Viktorov, P. Mandel, Hybrid mode-locking in a 40 GHz monolithic quantum dot laser, Appl. Phys. Lett., 96 (2010) pp. 011104/1--011104/3.

J.-E. Kim, E. Malic, M. Richter, A. Wilms, A. Knorr, Maxwell--Bloch equation approach for describing the microscopic dynamics of quantum-dot surface-emitting structures, IEEE J. Quantum Electron., 46 (2010) pp. 1115--1126.

M. Schulz-Ruhtenberg, I. Babushkin, N.A. Loiko, Th. Ackemann, K. Huang, Polarization properties in the transition from below to above lasing threshold in broad-area vertical-cavity surface-emitting lasers, Phys. Rev. A, 81 (2010) pp. 023819/1--023819/11.
Abstract

For highly divergent emission of broad-area vertical-cavity surface-emitting lasers (VCSELs) a rotation of the polarization direction by up to 90 degrees occurs when the pump rate approaches the lasing threshold. Well below threshold the polarization is parallel to the direction of the transverse wave vector and is determined by the transmissive properties of the Bragg reflectors that form the cavity mirrors. In contrast, near-threshold and above-threshold emission is more affected by the reflective properties of the reflectors and is predominantly perpendicular to the direction of transverse wave vectors. Two qualitatively different types of polarization transition are demonstrated: an abrupt transition, where the light polarization vanishes at the point of the transition, and a smooth one, where it is significantly nonzero during the transition.

I. Babushkin, Non-Poissonian statistics in an optical analog of quantum billiard with perfectly square boundaries, Phys. Lett. A, 374 (2010) pp. 896--900.
Abstract

We study deviation from the Poissonian statistics of the frequency spacing distribution, appearing due to coupling of polarizational and transverse degrees of freedom in a perfectly square vertical cavity surface emitting laser. The deviation can be controlled by strength of the intracavity anisotropy and its alignment to the device boundaries.

M. Wolfrum, S. Yanchuk, A multiple time scale approach to the stability of external cavity modes in the Lang--Kobayashi system using the limit of large delay, SIAM J. Appl. Dyn. Syst., 9 (2010) pp. 519--535.

V.Z. Tronciu, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, Improving the stability of distributed-feedback tapered master-oscillator power-amplifiers, Opt. Quantum Electron., 41 (2009) pp. 531--537.
Abstract

We report theoretical results on the wavelength stabilization in distributed-feedback master-oscillator power-amplifiers which are compact semiconductor laser devices capable of emitting a high brilliance beam at an optical power of several Watts. Based on a traveling wave equation model we calculate emitted optical power and spectral maps in dependence on the pump of the power amplifier. We show that a proper choice of the Bragg grating type and coupling coefficient allows to optimize the laser operation, such that for a wide range of injection currents the laser emits a high intensity continuous wave beam.

A.G. Vladimirov, A. Pimenov, D. Rachinskii, Numerical study of dynamical regimes in a monolithic passively mode locked semiconductor laser, IEEE J. Quantum Electron., 45 (2009) pp. 462--468.

R. Čiegis, I. Laukaitytė, M. Radziunas, Numerical algorithms for Schrödinger equation with artificial boundary conditions, Numer. Funct. Anal. Optim., 30 (2009) pp. 903--923.
Abstract

We consider a one-dimensional linear Schrödinger problem defined on an infinite domain and approximated by the Crank-Nicolson type finite difference scheme. To solve this problem numerically we restrict the computational domain by introducing the reflective, absorbing or transparent artificial boundary conditions. We investigate the conservativity of the discrete scheme with respect to the mass and energy of the solution. Results of computational experiments are presented and the efficiency of different artificial boundary conditions is discussed.

I.V. Ermakov, V.Z. Tronciu, P. Colet, C.R. Mirasso, Controlling the unstable emission of a semiconductor laser subject to conventional optical feedback with a filtered feedback branch, Optics Express, 17 (2009) pp. 8749--8755.

A. Jechow, M. Lichtner, R. Menzel, M. Radziunas, D. Skoczowsky, A.G. Vladimirov, Stripe-array diode-laser in an off-axis external cavity: Theory and experiment, Optics Express, 17 (2009) pp. 19599--19604.
Abstract

Stripe-array diode lasers naturally operate in an anti-phase supermode. This produces a sharp double lobe far field at angles $pm alpha$ depending on the period of the array. In this paper a 40 emitter gain guided stripe-array laterally coupled by off-axis filtered feedback is investigated experimentally and numerically. We predict theoretically and confirm experimentally that at doubled feedback angle $2 alpha$ a stable higher order supermode exists with twice the number of emitters per array period. The theoretical model is based on time domain traveling wave equations for optical fields coupled to the carrier density equation taking into account diffusion of carriers. Feedback from the external reflector is modeled using Fresnel integration.

M. Spreemann, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, Measurement and simulation of distributed-feedback tapered master-oscillator power-amplifiers, IEEE J. Quantum Electron., 45 (2009) pp. 609--616.

M. Radziunas, V.Z. Tronciu, U. Bandelow, M. Lichtner, M. Spreemann, H. Wenzel, Mode transitions in distributed-feedback tapered master-oscillator power-amplifier: Theory and experiments, Opt. Quantum Electron., 40 (2008) pp. 1103-1109.
Abstract

Theoretical and experimental investigations have been carried out to study the spectral and spatial behavior of monolithically integrated distributed-feedback tapered master-oscillators power-amplifiers emitting around 973 nm. Introduction of self and cross heating effects and the analysis of longitudinal optical modes allows us to explain experimental results. The results show a good qualitative agreement between measured and calculated characteristics.

V.Z. Tronciu, I.V. Ermakov, P. Colet, C.R. Mirasso, Chaotic dynamics of a semiconductor laser with double cavity feedback: Applications to phase shift keying modulation, Opt. Commun., 281 (2008) pp. 4747--4752.

V.Z. Tronciu, C.R. Mirasso, P. Colet, Chaos-based communications using on-off phase shift keying method, Moldavian J. Phys. Sci., 7 (2008) pp. 343--349.

V.Z. Tronciu, C.R. Mirasso, P. Colet, Chaos-based communications using semiconductor lasers subject to feedback from an integrated double cavity, J. Phys. B, 41 (2008) pp. 155401/1--155401/8.

S. Yanchuk, K.R. Schneider, O. Lykova, Amplitude synchronization in a system of two coupled semiconductor lasers, Ukrainian Math. J., 60 (2008) pp. 426-435.

R. Čiegis, M. Radziunas, M. Lichtner, Numerical algorithms for simulation of multisection lasers by using traveling wave model, IEEE J. Select. Topics Quantum Electron., 13 (2008) pp. 327-348.

M. Radziunas, A. Glitzky, U. Bandelow, M. Wolfrum, U. Troppenz, J. Kreissl, W. Rehbein, Improving the modulation bandwidth in semiconductor lasers by passive feedback, IEEE J. Select. Topics Quantum Electron., 13 (2007) pp. 136--142.

O.V. Ushakov, N. Korneyer, M. Radziunas, H.-J. Wünsche, F. Henneberger, Excitability of chaotic transients in a semiconductor laser, Europhys. Lett., 79 (2007) pp. 30004/1--30004/5.

E.A. Viktorov, P. Mandel, M. Kuntz, G. Fiol, D. Bimberg, A.G. Vladimirov, M. Wolfrum, Stability of the modelocked regime in quantum dot lasers, Appl. Phys. Lett., 91 (2007) pp. 231116/1-231116/3.

M. Radziunas, Numerical bifurcation analysis of the traveling wave model of multisection semiconductor lasers, Opt. Quantum Electron., 213 (2006) pp. 98--112.

S. Yanchuk, A. Stefanski, T. Kapitaniak, J. Wojewoda, Dynamics of an array of mutually coupled semiconductor lasers, Phys. Rev. E, 73 (2006) pp. 016209/1--016209/7.

B. Hüttl, H. Kaiser, Ch. Kindel, S. Fidorra, W. Rehbein, H. Stolpe, G. Sahin, U. Bandelow, M. Radziunas, A. Vladimirov, H. Heidrich, Experimental investigations on the suppression of Q-switching in monolithic 40 GHz mode-locked semiconductor lasers, Appl. Phys. Lett., 88 (2006) pp. 221104/1--221104/3.

M. Nizette, D. Rachinskii, A. Vladimirov, M. Wolfrum, Pulse interaction via gain and loss dynamics in passive mode-locking, Phys. D, 218 (2006) pp. 95--104.

T. Perez, M. Radziunas, H.-J. Wünsche, C.R. Mirasso, F. Henneberger, Synchronization properties of two coupled multisection semiconductor lasers emitting chaotic light, IEEE Phot. Tech. Letter, 18 (2006) pp. 2135-2137.

D.I. Rachinskii, A. Vladimirov, U. Bandelow, B. Hüttl, R. Kaiser, Q-switching instability in a mode-locked semiconductor laser, J. Opt. Soc. Amer. B Opt. Phys., 23 (2006) pp. 663--670.

V.Z. Tronciu, H.-J. Wünsche, M. Wolfrum, M. Radziunas, Semiconductor laser under resonant feedback from a Fabry--Perot resonator: Stability of continuous-wave operation, Phys. Rev. E, 73 (2006) pp. 046205/1--046205/7.

E. Viktorov, P. Mandel, A. Vladimirov, U. Bandelow, A model for mode-locking in quantum dot lasers, Appl. Phys. Lett., 88 (2006) pp. 201102/1--201102/3.

U. Bandelow, M. Radziunas, A. Vladimirov, B. Hüttl, R. Kaiser, 40 GHz Mode-locked semiconductor lasers: Theory, simulations and experiment, Opt. Quantum Electron., 38 (2006) pp. 495--512.

TH. Koprucki, M. Baro, U. Bandelow, Th. Tien, F. Weik, J.W. Tomm, M. Grau, M.-Ch. Amann, Electronic structure and optoelectronic properties of strained InAsSb/GaSb multiple quantum wells, Appl. Phys. Lett., 87 (2005) pp. 181911/1--181911/3.

A. Vladimirov, D. Turaev, Model for passive mode locking in semiconductor lasers, Phys. Rev. A, 72 (2005) pp. 033808/1-033808/13.

S. Yanchuk, Properties of stationary states of delay equations with large delay and applications to laser dynamics, Math. Methods Appl. Sci., 28 (2005) pp. 363--377.

A.G. Vladimirov, D.V. Turaev, G. Kozyreff, Delay differential equations for mode-locked semiconductor lasers, , 29 (2004) pp. 1221--1223.

A.G. Vladimirov, D.V. Turaev, A new model for a mode-locked semiconductor laser, Radiophys. and Quantum Electronics, 47 (2004) pp. 769--776.

S. Bauer, J. Kreissl, M. Radziunas, H.-J. Wünsche, F. Henneberger, J. Sieber, M. Sartorius, O. Brox, Nonlinear dynamics of semiconductor lasers with active optical feedback, Phys. Rev. E (3), 69 (2004) pp. 016206/1--016206/10.

J. Sieber, M. Radziunas, K.R. Schneider, Dynamics of multisection semiconductor lasers, Math. Model. Anal., 9 (2004) pp. 51--66.

J. Sieber, L. Recke, K.R. Schneider, Dynamics of multisection semiconductor lasers, J. Math. Sci. (N. Y.), 124 (2004) pp. 5298--5309.

K.R. Schneider, S. Yanchuk, L. Recke, Dynamics of two mutually coupled semiconductor lasers: Instantaneous coupling limit, Phys. Rev. E (3), 69 (2004) pp. 056221/1--056221/12.

V. Tronciu, Investigation of self-pulsation and excitability of tandem blue lasers, AIUB J. Sci. Engrg., 3 (2004) pp. 7--10.

O. Brox, S. Bauer, M. Radziunas, M. Wolfrum, J. Sieber, J. Kreissl, B. Sartorius, H.-J. Wünsche, High-frequency pulsations in DFB-lasers with amplified feedback, Numer. Funct. Anal. Optim., 39 (2003) pp. 1381--1387.

B. Krauskopf, K.R. Schneider, J. Sieber, S. Wieczorek, M. Wolfrum, Excitability and self-pulsations near homoclinic bifurcations in semiconductor laser systems, IEEE J. Quantum Electron., 215 (2003) pp. 367--379.

H.-J. Wünsche, M. Radziunas, S. Bauer, O. Brox, B. Sartorius, Simulation of phase-controlled mode-beating lasers, IEEE J. Select. Topics Quantum Electron., 9 (2003) pp. 857--864.

U. Bandelow, R. Hünlich, Th. Koprucki, Simulation of static and dynamic properties of edge-emitting multiple-quantum-well lasers, IEEE J. Select. Topics Quantum Electron., 9 (2003) pp. 798--806.

A.G. Vladimirov, G. Kozyreff, P. Mandel, Synchronization of weakly stable oscillators and semiconductor laser arrays, Europhys. Lett., 61 (2003) pp. 613--619.

A.G. Vladimirov, G. Kozyreff, P. Mandel, Synchronization of weakly stable oscillators and semiconductor laser arrays, Europhys. Lett., 61 (2003) pp. 613--619.

H.-J. Wünsche, O. Brox, M. Radziunas, F. Henneberger, Excitability of a semiconductor laser by a two-mode homoclinic bifurcation, Phys. Rev. Lett., 88 (2002) pp. 023901/1--023901/4.

D. Turaev, M. Wolfrum, Instabilities of lasers with moderately delayed optical feedback, IEEE J. Quantum Electron., 213 (2002) pp. 127--138.

U. Bandelow, M. Radziunas, J. Sieber, M. Wolfrum, Impact of gain dispersion on the spatio-temporal dynamics of multisection lasers, IEEE J. Quantum Electron., 37 (2001) pp. 183--188.

M. Möhrle, B. Sartorius, C. Bornholdt, S. Bauer, O. Brox, A. Sigmund, R. Steingräber, M. Radziunas, H.-J. Wünsche, Detuned grating multi-section-RW-DFB lasers for high speed optical signal processing, IEEE J. Select. Topics Quantum Electron., 7 (2001) pp. 217--223.

V. Tronciu, H.-J. Wünsche, J. Sieber, K.R. Schneider, Dynamics of single mode semiconductor lasers with passive dispersive reflectors, , 182 (2000) pp. 221--228.

M. Radziunas, H.-J. Wünsche, B. Sartorius, O. Brox, D. Hoffmann, K.R. Schneider, D. Marcenac, Modeling self-pulsating DFB-lasers with an integrated phase tuning section, IEEE J. Quantum Electron., 36 (2000) pp. 1026--1034.

A. Pimenov, G. Kozyreff, V.Z. Tronciu, A.G. Vladimirov, Theoretical analysis of a multi-stripe laser array with external off-axis feedback, in: Semiconductor Lasers and Laser Dynamics V, K. Panajotov, M. Sciamanna, A. Valle, R. Michalzik, eds., 8432 of Proceedings of SPIE, SPIE, Bellingham, Washington, 2012, pp. 843212/1--843212/10.

M. Radziunas, K. Staliunas, Spatial ``rocking'' for improving the spatial quality of the beam of broad area semiconductor lasers, in: Semiconductor Lasers and Laser Dynamics V, K. Panajotov, M. Sciamanna, A.A. Valle, R. Michalzik, eds., 8432 of Proceedings of SPIE, SPIE, Bellingham, Washington, 2012, pp. 84320Q/1--84320Q/9.

E. Averlant, M. Tlidi, A.G. Vladimirov, H. Thienpont, K. Panajotov, Delay induces motion of multipeak localized structures in cavity semiconductors, in: Semiconductor Lasers and Laser Dynamics V, K. Panajotov, M. Sciamanna, A. Valle, R. Michalzik, eds., 8432 of Proceedings of SPIE, SPIE, Bellingham, Washington, 2012, pp. 84321D/1--84321D/6.

C. Brée, S. Amiranashvili, U. Bandelow, Spatio-temporal pulse propagation in nonlinear dispersive optical media, in: Proceedings of the 12th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD'12, J. Piprek, W. Lu, eds., IEEE Conference Publications Management Group, New Jersey, USA, 2012, pp. 131--132.

A.G. Vladimirov, D. Rachinskii, M. Wolfrum, Modeling of passively mode-locked semiconductor lasers, in: Nonlinear Laser Dynamics: From Quantum Dots to Cryptography, K. Lüdge, ed., Reviews in Nonlinear Dynamics and Complexity, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2012, pp. 183--216.

M. Radziunas, A.G. Vladimirov, E.A. Viktorov, G. Fiol, H. Schmeckebier, D. Bimberg, Strong asymmetry of mode-locking pulses in quantum-dot semiconductor lasers, in: CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CB3_5, pp. 1--1.

M. Radziunas, K. Staliunas, Spatial ``rocking'' in broad emission area semiconductor lasers, in: CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CB5_2, pp. 1--1.

A. Rusu, C. Pirtac, S. Rusu, V.Z. Tronciu, On/Off phase shift keying encryption method of semiconductor lasers with an air gap (in Romanian), in: Proceeding of the 7th International Conference on Microelectronics and Computer Science, Chisinau, September 22--24, 2011, Moldova, V. Kanter, I. Balmus, eds., 1, Technical University of Moldova, 2011, pp. 402-403.

A. Rusu, C. Pirtac, S. Rusu, V.Z. Tronciu, Verification of Steiner's theorem with physical pendulum --- Computer assisted laboratory work (in Romanian), in: Proceeding of the 7th International Conference on Microelectronics and Computer Science, Chisinau, September 22--24, 2011, Moldova, V. Kanter, I. Balmus, eds., 1, Technical University of Moldova, 2011, pp. 404-405.

C. Brée, A. Demircan, G. Steinmeyer, Saturation of the all-optical Kerr effect, in: CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper EF4_6, pp. 1-1.

V.Z. Tronciu, S.S. Rusu, A.S. Rusu, On/Off phase shift keying encryption method of semiconductor lasers with an air gap, in: Proceeding of the 7th International Conference on Microelectronics and Computer Science, Chisinau, September 22--24, 2011, Moldova, V. Kanter, I. Balmus, eds., 1, Technical University of Moldova, 2011, pp. 29-32.

V.Z. Tronciu, On the dynamics of multimode semiconductor lasers, in: Proceeding of the 7th International Conference on Microelectronics and Computer Science, Chisinau, September 22--24, 2011, Moldova, V. Kanter, I. Balmus, eds., 1, Technical University of Moldova, 2011, pp. 27--28.

A.G. Vladimirov, D. Rachinskii, M. Wolfrum, Modeling of passively mode-locked semiconductor lasers, in: Nonlinear Laser Dynamics: From Quantum Dots to Cryptography, K. Lüdge, ed., Reviews in Nonlinear Dynamics and Complexity, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2011, pp. 183--216.

M. Radziunas, A.G. Vladimirov, E.A. Viktorov, Traveling wave modeling, simulation and analysis of quantum-dot mode-locked semiconductor lasers, in: Semiconductor Lasers and Laser Dynamics IV, K. Panajotov, M. Sciamanna, A.A. Valle, R. Michalzik, eds., 7720 of Proceedings of SPIE, SPIE, 2010, pp. 77200X/1--77200X/8.

V.Z. Tronciu, C. Fiebig, M. Lichtner, H. Wenzel, Numerical and experimental investigations of DBR tapered lasers, in: Proceedings of the 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), V. Kantser, S. Andronic, eds., 1, Technical University of Moldova, Chisinau, 2010, pp. 73--76.

V.Z. Tronciu, S.S. Rusu, C. Pîrtac, Dynamics of coupled semiconductor lasers. On/off phase shift keying encryption method, in: Proceedings of the 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), V. Kantser, S. Andronic, eds., 1, Technical University of Moldova, Chisinau, 2010, pp. 77--80.

V.Z. Tronciu, Semiconductor laser a key element for new generation optoelectronic systems, in: Proceedings of the 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), V. Kantser, S. Andronic, eds., 1, Technical University of Moldova, Chisinau, 2010, pp. 67--72.

I.V. Ermakov, G. Van DER Sande, L. Gelens, A. Scire, P. Colet, C.R. Mirasso, V.Z. Tronciu, J. Danckaert, Numerical investigation of nonlinear dynamics of semiconductor ring lasers with two external cavities, in: Proceedings of the Young Optical Scientists Conference, YOSC-2009, V. Karassik, ed., Bauman Moscow State Technical University Press, 2010, pp. 106--109.

A. Jechow, D. Skoczowsky, M. Lichtner, M. Radziunas, R. Menzel, High-brightness emission from stripe-array broad area diode lasers operated in off-axis external cavities, in: High-Power Diode Laser Technology and Applications VIII, M.S. Zediker, ed., 7583 of Proceedings of SPIE, SPIE, 2010, pp. 758312/1--758312/11.

A.G. Vladimirov, M. Wolfrum, G. Fiol, D. Arsenijević, D. Bimberg, E. Viktorov, P. Mandel, D. Rachinskii, Locking characteristics of a 40-GHz hybrid mode-locked monolithic quantum dot laser, in: Semiconductor Lasers and Laser Dynamics IV, K. Panajotov, M. Sciamanna, A.A. Valle, R. Michalzik, eds., 7720 of Proceedings of SPIE, SPIE, 2010, pp. 77200Y/1--77200Y/8.

M. Radziunas, A.G. Vladimirov, E. Viktorov, Traveling wave modeling of mode-locked quantum dot semiconductor lasers, in: CLEO/Europe and EQEC 2009 Conference Digest (Optical Society of America, 2009), oral presentation CB4.4 TUE, 2009, pp. 1--1.

M. Radziunas, Simulation of switching between stable unidirectional states in semiconductor ring lasers, in: CLEO/Europe and EQEC 2009 Conference Digest (Optical Society of America, 2009), poster CB.P.12 TUE, 2009, pp. 1--1.

V.Z. Tronciu, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, Calculation of improved features of distributed-feedback tapered master-oscillator power-amplifiers, in: CLEO/Europe and EQEC 2009 Conference Digest (Optical Society of America, 2009), poster CB.P.30 TUE, 2009, pp. 1--1.

V.Z. Tronciu, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, Dynamics and stability improvement of DFB tapered master-oscillator power-amplifiers, in: Proceedings of the 6th International Conference on Microelectronics and Computer Science, Chisinau, Moldova, October 1--3, 2009, I.M. Tiginyanu, I. Balmus, eds., Technical University of Moldova, Chisinau, 2009, pp. 15-18.

V.Z. Tronciu, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, Improving the stability of distributed-feedback tapered master-oscillator power-amplifiers, in: Proceedings of the 9th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD'09, J. Piprek, Y.-T. Lee, eds., IEEE/LEOS, 2009, pp. 55-56.

M. Schulz-Ruhtenberg, I. Babushkin, N.A. Loiko, K.F. Huang, T. Ackemann, Analysis of polarization states of broad-area vertical-cavity surface-emitting lasers below and above threshold, in: 2009 IEEE/LEOS Winter Topicals Meeting Series (WTM 2009), IEEE, 2009, pp. 178-179.

E.V. Viktorov, P. Mandel, A.G. Vladimirov, M. Wolfrum, G. Fiol, M. Kuntz, D. Bimberg, Hybrid mode-locking in a 40 GHz monolithic quantum dot laser, in: CLEO/Europe and EQEC 2009 Conference Digest (Optical Society of America, 2009), oral presentation CB4.2 TUE, 2009, pp. 1--1.

M. Radziunas, Travelling wave modeling of semiconductor ring lasers, in: Semiconductor Lasers and Laser Dynamics III, K.P. Panajotov, M. Sciamanna, A.A. Valle, R. Michalzik, eds., 6997 of Proceedings of SPIE, SPIE, 2008, pp. 69971B/1--69971B/9.

M. Lichtner, M. Radziunas, U. Bandelow, M. Spreemann, H. Wenzel, Dynamic simulation of high brightness semiconductor lasers, in: Proceedings of the 8th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD'08, J. Piprek, E. Larkins, eds., IEEE/LEOS, 2008, pp. 65--66.

M. Radziunas, U. Troppenz, J. Kreissl, Tailoring single-mode DFB laser with integrated passive feedback section for direct modulation applications, in: Proceedings of the European Conference on Lasers and Electro-Optics, 2007, and the International Quantum Electronics Conference. CLEO/IQEC 2007 (oral presentation CB-35-WED), IEEE, 2007, pp. 1--1.

J. Kreissl, U. Troppenz, W. Rehbein, T. Gärtner, P. Harde, M. Radziunas, 40 Gbit/s directly modulated passive feedback laser with complex-coupled DFB section, in: Proceedings of ECOC 2007, VDE Verlag GmbH, Berlin/Offenbach, 2007, pp. 213--214.

T. Perez, C. Mirasso, H.-J. Wünsche, F. Henneberger, M. Radziunas, I. Fischer, Synchronization of chaotic unidirectionally coupled multisection lasers, in: Proceedings of the European Conference on Lasers and Electro-Optics, 2007, and the International Quantum Electronics Conference. CLEO/IQEC 2007 (oral presentation JSI3-2-THU), IEEE, 2007, pp. 1-1.

L. Recke, M. Wolfrum, S. Yanchuk, Dynamics of coupled semiconductor lasers, in: Analysis and Control of Complex Nonlinear Processes in Physics, Chemistry and Biology, Chapter 6, L. Schimansky-Geier, B. Fiedler, J. Kurths, E. Schöll, eds., World Scientific, New Jersey [et al.], 2007, pp. 185--212.

O.V. Ushakov, H.-J. Wünsche, F. Henneberger, M. Radziunas, Excitability of chaotic transients in a semiconductor laser, in: Proceedings of the European Conference on Lasers and Electro-Optics, 2007, and the International Quantum Electronics Conference. CLEO/IQEC 2007 (oral presentation IG6-2-THU), IEEE, 2007, pp. 1--1.

E.A. Viktorov, P. Mandel, M. Kuntz, G. Fiol, D. Bimberg, A.G. Vladimirov, M. Wolfrum, Stability of the modelocking regime in quantum dot laser, in: Proceedings of the European Conference on Lasers and Electro-Optics, 2007, and the International Quantum Electronics Conference. CLEO/IQEC 2007 (oral presentation IG6-3-THU), IEEE, 2007, pp. 1--1.

M. Radziunas, H.-J. Wünsche, B. Krauskopf, M. Wolfrum, External cavity modes in Lang--Kobayashi and traveling wave models, in: Semiconductor Lasers and Laser Dynamics II, D. Lenstra, M. Pessa, I.H. White, eds., 6184 of Proceedings of SPIE, 2006, pp. 61840X/1--61840X/9.

T. Perez, M. Radziunas, H.-J. Wünsche, C.R. Mirasso, F. Henneberger, Chaos synchronization of unidirectionally coupled multisection lasers, in: Proceedings of the 32nd European Conference on Optical Communication (ECOC 2006), 2006, pp. paper Tu3.1.5/1--Tu3.1.5/2.

U. Troppenz, J. Kreissl, W. Rehbein, C. Bornholdt, T. Gaertner, M. Radziunas, A. Glitzky, U. Bandelow, M. Wolfrum, 40 Gb/s directly modulated InGaAsP passive feedback DFB laser, in: Proceedings of the 32nd European Conference on Optical Communication (ECOC 2006), Postdeadline session, 2006, pp. Th4.5.5/1--Th4.5.5/2.

M. Radziunas, U. Bandelow, M. Wolfrum, A. Glitzky, R. Hünlich, U. Troppenz, J. Kreissl, Design of multisection semiconductor laser for 40 Gb/s direct modulation, in: Proceedings of the 31st European Conference on Optical Communication ECOC 2005, Glasgow, UK, September 25--29, 2005, 3, Institution of Electrical Engineers, London, 2005, pp. 677-678.

M. Radziunas, Tailoring the dynamics of multisection lasers for 40 Gb/s direct modulation, in: Proceedings of the 5th International Conference on ``Numerical Simulation of Optoelectronic Devices'' (NUSOD'05) in Berlin, September 19--22, 2005, H.-J. Wünsche, J. Piprek, U. Bandelow, H. Wenzel, eds., IEEE, Piscataway, NJ, 2005, pp. 29--30.

U. Troppenz, M. Hamacher, M. Radziunas, H. Heidrich, Optical switching of clockwise/anti-clockwise lasing in bus coupled microrings, in: Indium Phosphide and Related Materials, I. Thayne, J. Marsh, C. Bryce, eds., IEEE, Piscataway, 2005, IEEE Catalogue no. 05CH37633C.

M. Wolfrum, S. Yanchuk, Synchronous and asynchronous instabilities of two lasers with a long delayed coupling, in: Proceedings of the ENOC-2005 Fifth EUROMECH Nonlinear Dynamics Conference, Eindhoven, The Netherlands, August 7--12, 2005, D.H. VAN Campen, M.D. Lazurko, W.P.J.M. caps">caps">van der Oever, eds., 2005, pp. 2069--2073.

S. Yanchuk, K.R. Schneider, L. Recke, Dynamics of two F2F coupled lasers: Instantaneous coupling limit, in: Proceeding of SPIE: Semiconductor Lasers and Laser Dynamics Conference ``Photonics Europe'', 5452, SPIE, Washington, USA, 2004, pp. 51--62.

N. Korneyev, M. Radziunas, H.-J. Wünsche, F. Henneberger, Mutually injecting semiconductor lasers: Simulations for short and zero delay, in: Proceedings of SPIE: Semiconductor Lasers and Laser Dynamics Conference ``Photonics Europe'', 5452, SPIE, Washington, 2004, pp. 63--70.

V. Tronciu, R.A. Abram, M. Yamada, Dynamics of blue InGaN laser. Self pulsation and excitability, The International Conference ``40 years of TUM'', Chisinau, Moldova, 2004, pp. 112--113.

N. Korneyev, M. Radziunas, H.-J. Wünsche, F. Henneberger, Bifurcations of a DFB laser with short optical feedback: Numerical experiment, in: Physics and Simulation of Optoelectronic Devices XI, M. Osinski, H. Amano, P. Blood, eds., 4986 of SPIE Proceedings Series, Bellingham, USA, 2003, pp. 480--489.

J. Sieber, L. Recke, K.R. Schneider, Dynamics of multisection semiconductor lasers (in Russian), Proceedings of the International Conference on Differential and Functional Differential Equations, Moscow, Russia, August 11 - 17, 2002, 2 of Sovrem. Probl. Mat. Fund. Naprav., 2003, pp. 70--82.

U. Bandelow, H. Gajewski, R. Hünlich, Thermodynamic designed energy model, in: Proceedings of the IEEE/LEOS 3rd International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices (NUSOD'03), J. Piprek, ed., 2003, pp. 35--37.

H.-Chr. Kaiser, U. Bandelow, Th. Koprucki, J. Rehberg, Modelling and simulation of strained quantum wells in semiconductor lasers, in: Mathematics --- Key Technology for the Future. Joint Projects Between Universities and Industry, W. Jäger, H.-J. Krebs, eds., Springer, Berlin [u.a.], 2003, pp. 377--390.

M. Radziunas, H.J. Wünsche, Dynamics of multisection DFB semiconductor laser: Traveling wave and mode approximation models, in: Physics and Simulation of Optoelectronic Devices X, P. Blood, M. Osinski, Y. Arakawa, eds., 4646 of Proceedings of SPIE, Bellingham, USA, 2002, pp. 27--37.

M. Radziunas, H.J. Wünsche, LDSL: A tool for simulation and analysis of longitudinal dynamics in multisection semiconductor lasers, in: Proceedings of the Conference on Numerical Simulation of Semiconductor Optoelectronic Devices, NUSOD-02, Zürich, Switzerland, September 25--27, 2002, A. Tarraf, J. Daleiden, F. Römer, C. Prott ET AL., eds., 2002, pp. 26--27.

M. Radziunas, H.-J. Wünsche, O. Brox, F. Henneberger, Excitability of a DFB laser with short external cavity, in: Physics and Simulation of Optoelectronic Devices X, P. Blood, M. Osinski, Y. Arakawa, eds., 4646 of Proceedings of SPIE, Bellingham, USA, 2002, pp. 420--428.

U. Bandelow, M. Radziunas, V. Tronciu, H.-J. Wünsche, F. Henneberger, Tailoring the dynamics of diode lasers by passive dispersive reflectors, in: Physics and Simulation of Optoelectronic Devices VIII, R.H. Binder, P. Blood, M. Osinski, eds., 3944 of Proceedings of SPIE, SPIE, Bellingham, WA, 2000, pp. 536--545.

A. Wilms, P. Mathé, F. Schulze, Th. Koprucki, A. Knorr, U. Bandelow, Influence of the carrier reservoir dimensionality on electron-electron scattering in quantum dot materials, Preprint no. 1781, WIAS, Berlin, 2013.
Abstract, Postscript (2784 kByte), PDF (480 kByte)

We calculated Coulomb scattering rates from quantum dots (QDs) coupled to a 2D carrier reservoir and QDs coupled to a 3D reservoir. For this purpose, we used a microscopic theory in the limit of Born-Markov approximation, in which the numerical evaluation of high dimensional integrals is done via a quasi-Monte Carlo method. Via a comparison of the so determined scattering rates, we investigated the question whether scattering from 2D is generally more efficient than scattering from 3D. In agreement with experimental findings, we did not observe a significant reduction of the scattering efficiency of a QD directly coupled to a 3D reservoir. In turn, we found that 3D scattering benefits from it?s additional degree of freedom in the momentum space.

A. Pérez-Serrano, J. Javaloyes, S. Balle, Spectral delay algebraic equation approach to broad area laser diodes, Preprint no. 1755, WIAS, Berlin, 2012.
Postscript (7574 kByte), PDF (1243 kByte)

M. Radziunas, R. Čiegis, A. Mirinavičius, Compact high order finite difference schemes for linear Schrödinger problems on non-uniform meshes, Preprint no. 1748, WIAS, Berlin, 2012.
Postscript (487 kByte), PDF (254 kByte)

M. Tlidi, E. Averlant, A.G. Vladimirov, K. Panajotov, Spontaneous motion of cavity solitons induced by a delayed feedback, Preprint no. 1737, WIAS, Berlin, 2012.
Abstract, Postscript (4013 kByte), PDF (1728 kByte)

We consider a broad area Vertical-Cavity Surface Emitting Laser (VCSEL) operating below the lasing threshold and subject to optical injection and time-delayed feedback. We derive a generalized delayed Swift-Hohenberg equation for the VCSEL system which is valid close to the nascent optical bistability. We first characterize the stationary cavity solitons by constructing their snaking bifurcation diagram and by showing clustering behavior within the pinning region of parameters. Then we show that the delayed feedback induces a spontaneous motion of two-dimensional cavity solitons in an arbitrary direction in the transverse plane. We characterize moving cavity solitons by estimating their threshold and calculating their velocity. Numerical 2D solutions of the governing semiconductor laser equations are in close agreement with those obtained from the delayed generalized Swift- Hohenberg equation.

R. Arkhipov, A. Pimenov, M. Radziunas, A.G. Vladimirov, D. Arsenjević, D. Rachinskii, H. Schmeckebier, D. Bimberg, Hybrid mode-locking in edge-emitting semiconductor lasers: Simulations, analysis and experiments, Preprint no. 1734, WIAS, Berlin, 2012.
Abstract, Postscript (2221 kByte), PDF (830 kByte)

Hybrid mode-locking in a two section edge-emitting semiconductor laser is studied numerically and analytically using a set of three delay differential equations. In this set the external RF signal applied to the saturable absorber section is modeled by modulation of the carrier relaxation rate in this section. Estimation of the locking range where the pulse repetition frequency is synchronized with the frequency of the external modulation is performed numerically and the effect of the modulation shape and amplitude on this range is investigated. Asymptotic analysis of the dependence of the locking range width on the laser parameters is carried out in the limit of small signal modulation. Our numerical simulations indicate that hybrid mode-locking can be also achieved in the cases when the frequency of the external modulation is approximately twice larger and twice smaller than the pulse repetition frequency of the free running passively mode-locked laser fP . Finally, we provide an experimental demonstration of hybrid mode-locking in a 20 GHz quantum-dot laser with the modulation frequency of the reverse bias applied to the absorber section close to fP =2.

A. Pimenov, V.Z. Tronciu, U. Bandelow, A.G. Vladimirov, Dynamical regimes of multi-stripe laser array with external off-axis feedback, Preprint no. 1731, WIAS, Berlin, 2012.
Abstract, Postscript (1546 kByte), PDF (535 kByte)

We study theoretically the dynamics of a multistripe laser array with an external cavity formed by either a single or two off-axis feedback mirrors, which allow to select a single lateral mode with transversely modulated intensity distribution. We derive and analyze a reduced model of such an array based on a set of delay differential equations taking into account transverse carrier grating in the semiconductor medium. With the help of the bifurcation analysis of the reduced model we show the existence of single and multimode instabilities leading to periodic and irregular pulsations of the output intensity. In particular, we observe a multimode instability leading to a periodic regime with anti-phase oscillating intensities of the two counter-propagating waves in the external cavity. This is in agreement with the result obtained earlier with the help of a 2+1 dimensional traveling wave model.

U. Bandelow, Spatio-Temporal Pulse Propagation in nonlinear dispersive optical Media, NUSOD 2013, August 16 - 24, 2013, Vancouver, Canada.

R. Arkhipov, M. Radziunas, A. Vladimirov, Theoretical analysis of hybrid mode-locked quantum dot semiconductor lasers, International Conference ``Laser Optics 2012'', St. Petersburg, Russia, June 25 - 29, 2012.

R. Arkhipov, M.V. Arkhipov, S.A. Pulkin, Numerical simulations of lasing without population inversion in two-level optically dense medium, International Conference ``Laser Optics 2012'', St. Petersburg, Russia, June 25 - 29, 2012.

R. Arkhipov, Mathematical modeling of mode-locking in semiconductor quantum dot lasers, TU Berlin, SFB 787, Doktorandenseminar, Technische Universität Berlin, February 17, 2012.

R. Arkhipov, Modelling of mode-locked quantum dot lasers, Initial Training Network PROPHET Workshop: Theory and Modelling in Photonics, April 11 - 19, 2012, Pavia, Italy, April 12, 2012.

R. Arkhipov, Numerical analysis of hybrid mode-locking in edge-emitting quantum dot semiconductor lasers, SPIE Photonics Europe Conference, Brussels, Belgium, April 16 - 19, 2012.

R. Arkhipov, Emission of the new frequencies in the resonant medium under the conditions of excitation by an object propagating at superluminal velocity, XIV All-Russian Scientific School-Seminar ``Wave Phenomena in Inhomogeneous Media'' (Waves-2012), May 21 - 28, 2012, Zvenigorod, Russia, May 24, 2012.

R. Arkhipov, Hybrid mode-locking in semiconductor quantum dot lasers: Simulation, analysis and comparison with experiments, ITN PROPHET Mid-Term Review Meeting, October 9 - 11, 2012, Paris, France, October 11, 2012.

R. Arkhipov, Numerical analysis of hybrid mode-locking in semiconductor quantum dot lasers, XIV All-Russian Scientific School-Seminar ``Wave Phenomena in Inhomogeneous Media'' (Waves-2012), Zvenigorod, Russia, May 21 - 26, 2012.

R. Arkhipov, Spectral and temporal characteristics of resonant medium radiation excited at the superluminal velocity, International Symposium Advances in Nonlinear Photonics, September 23 - 27, 2012, Belarusian State University, Minsk, Belarus, September 26, 2012.

R. Arkhipov, The new principle of the all-optical streak camera based on ultrafast laser beam deflection by light-induced coherent photonic crystal, International Symposium Advances in Nonlinear Photonics, September 23 - 27, 2012, Belarusian State University, Minsk, Belarus, September 25, 2012.

R. Arkhipov, Theoretical investigation of hybrid mode-locking in two-section semiconductor quantum dot lasers, International Symposium Advances in Nonlinear Photonics, September 23 - 27, 2012, Belarusian State University, Minsk, Belarus, September 24, 2012.

A. Pérez-Serrano, J. Javaloyes, S. Balle, Multiple channel wavelength conversion using a semiconductor ring laser, European Semiconductor Laser Workshop 2012, September 20 - 23, 2012, Vrije Universiteit Brussel, Brussels, Belgium, September 21, 2012.

A. Pimenov, Theoretical analysis of a multi-stripe laser array with external off-axis feedback, SPIE Photonics Europe 2012 Conference, April 16 - 19, 2012, Brussels, Belgium, April 17, 2012.

M. Radziunas, Hybrid mode-locking in semiconductor lasers: Simulations, analysis and experiments, ESLW2012 Workshop, September 21 - 22, 2012, Brussels, Belgium, September 21, 2012.

M. Radziunas, Spatial rocking for improving the spatial quality of the beam of broad area semiconductor lasers, SPIE Photonics Europe Conference, April 16 - 19, 2012, Brussels, Belgium, April 17, 2012.

M. Radziunas, Theoretical study of beam quality improvement in broad area semiconductor devices, International Symposium ``Advances in Nonlinear Photonics'', September 23 - 27, 2012, Belarusian State University, Minsk, September 24, 2012.

M. Radziunas, Theoretical study of beam quality improvment in broad area semiconductor devices, ESLW2012 Workshop, September 21 - 22, 2012, Brussels, Belgium, September 21, 2012.

U. Bandelow, Mathematical modeling and simulation of semiconductor lasers, Block Seminar of SFB 787 School of Nanophotonics, May 13 - 16, 2012, Technische Universität Berlin, Graal-Müritz, May 15, 2012.

U. Bandelow, Rogue waves in extended nonlinear Schrödinger equations: Integrable Sasa--Satsuma case, The Optical Society's (OSA) Annual Meeting Frontiers in Optics 2012, October 13 - 19, 2012, Rochester Section of the Optical Society of America, Rochester, USA, October 18, 2012.

U. Bandelow, Rogue waves in the Sasa--Satsuma equation, International Symposium ``Advances in Nonlinear Photonics'', September 24 - 28, 2012, Belarusian State University, Minsk, September 25, 2012.

U. Bandelow, Spatio-temporal pulse propagation in nonlinear dispersive optical media, 12th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD12), August 26 - September 4, 2012, Shanghai, China, August 30, 2012.

C. Brée, Generalization of all-optical Kerr effect in gases and wide bandgap solids, International Symposium ''Advances in Nonlinear Photonics'', September 24 - 28, 2012, Belarusian State University, Minsk, September 25, 2012.

O. Omel'chenko, Partially synchronized patterns in systems of non-locally coupled phase oscillators, Institut für Mathematik, Kiev, Ukraine, February 6, 2012.

O. Omel'chenko, Nonuniversal transitions to synchrony in the Sakaguchi--Kuramoto model, Colloquium on Complex and Biological Systems, Universität Potsdam, November 26, 2012.

A.G. Vladimirov, Nonlinear dynamics in lasers, FP7 Marie Curie Initial Training Network PROPHET Workshop: Theory and Modelling in Photonics, April 11 - 13, 2012, Pavia, Italy, April 11, 2012.

A.G. Vladimirov, Theoretical modeling of mode-locked quantum dot lasers, SPIE Photonics Europe Conference, April 16 - 19, 2012, Brussels, Belgium, April 18, 2012.

M. Wolfrum, Collective and localized Turing patterns on irregular networks, Seminar Complex Nonlinear Processes in Chemistry and Biology, Fritz-Haber-Institut, Berlin, June 15, 2012.

M. Radziunas, Broadening of mode-locking pulses in quantum-dot semiconductor lasers: Simulation, analysis and experiments, International Workshop ``Nonlinear Photonis: Theory, Materials, Applications'', August 24 - 26, 2011, St. Petersburg, Russia, August 24, 2011.

A.G. Vladimirov, Cavity solitons in broad area laser systems with delayed feedback, Yaroslavl Demidov State University, Russia, September 6, 2011.

A.G. Vladimirov, Mobility properties of 2D cavity solitons in systems with delayed feedback, CLEO/Europe-EQEC Conference, 22-26 May 2011, München, May 26, 2011.

A.G. Vladimirov, Mode-locking in quantum well and quantum dot semiconductor lasers, Yaroslavl Demidov State University, Russia, August 16, 2011.

A.G. Vladimirov, Synchronization of interacting temporal cavity oscillons, CLEO/Europe-EQEC Conference, 22-26 May 2011, München, May 26, 2011.

A. Wilms, A. Schliwa, Th. Koprucki, D. Breddermann, P. Mathé, A. Knorr, U. Bandelow, Theory of Coulomb scattering from two- and three-dimensional reservoirs to quantum dot states, 11th International Conference on Physics of Light-Matter Coupling in Nanostructures (PLMCN11), Berlin, April 6, 2011.

A. Wilms, Current state of our model for Coulomb scattering in semiconductor quantum dot lasers, Universität Bremen, Institut für theoretische Physik, Arbeitsgruppe Halbleiterphysik, February 23, 2011.

A. Wilms, Theory of Coulomb scattering in semiconductor quantum dot lasers, Mathematical Challenges of Quantum Transport in Nano-Optoelectronic Systems, February 4 - 5, 2011, WIAS, February 4, 2011.

M. Radziunas, K. Staliunas, Spatial ``rocking'' in broad area semiconductor lasers, European Semiconductor Laser Workshop (ESLW) 2011, Lausanne, Switzerland, September 23 - 24, 2011.

M. Radziunas, Spatial "rocking" in broad emission area semiconductor lasers, CLEO/Europe-EQEC Conference, 22-26 May 2011, München, May 25, 2011.

M. Radziunas, Strong asymmetry of mode-locking pulses in quantum-dot semiconductor lasers, CLEO/Europe-EQEC Conference, 22-26 May 2011, München, May 24, 2011.

M. Radziunas, Drittmittelaquise - Wie schreibe ich einen Drittmittelantrag ?, Weiterbildungsveranstaltung SW 014-SS 11, FU Berlin, August 17, 2011.

V.Z. Tronciu, M. Radziunas, S. Schwertfeger, A. Klehr, U. Bandelow, H. Wenzel, Modelling of dynamics in broad area semiconductor devices: Picosecond pulse amplification in tapered amplifiers, European Semiconductor Laser Workshop (ESLW) 2011, Lausanne, Switzerland, September 23 - 24, 2011.

A.G. Vladimirov, Delay differential equations model of a mode-locked semiconductor laser, Yaroslavl Demidov State University, Russia, August 18, 2011.

A.G. Vladimirov, Delay differential equations models in laser dynamics, Yaroslavl Demidov State University, Russia, August 30, 2011.

A. Wilms, About the Influence of the carrier reservoir dimensionality on Coulomb scattering in quantum dot materials, SFB 787, Graduiertenkolleg, Doktorandenseminar, Technische Universität Berlin, December 2, 2011.

C. Brée, A. Demircan, G. Steinmeyer, Saturation of the All-Optical Kerr Effect, CLEO/Europe-EQEC Conference, 22-26 May 2011, München, May 26, 2011.

V. Tronciu, High power lasers for modern technologies, NANO-2011 Cooperation and Networking of Universities and Research Institutes --- Study by Doing Research, October 6 - 9, 2011, Academy of Science, Institute of Electronic Engineering and Nanotechnologies, Kishinev, Moldova, October 8, 2011.

V. Tronciu, Picoseconds pulse amplification --- Theory and experiment, Technical University of Moldova, Department of Physics, Chisinau, April 20, 2011.

V. Tronciu, Nonlinear dynamics in semiconductor lasers --- Theory and experiments, Academy of Sciences of the Republic of Moldova, Institute of Energy, Chisinau, July 28, 2011.

M. Radziunas, Modeling, simulation and analysis of nonlinear dynamics in multisection semiconductor lasers, 15th International Conference ``Mathematical Modelling and Analysis'' (MMA2010), May 26 - 29, 2010, Druskininkai, Lithuania, May 29, 2010.

M. Radziunas, Traveling wave modeling, simulation and analysis of quantum-dot mode-locked semiconductor lasers, Conference on Semiconductor Lasers and Laser Dynamics IV within SPIE Photonics Europe 2010, April 12 - 16, 2010, Brussels, Belgium, April 14, 2010.

V.Z. Tronciu, C. Fiebig, M. Lichtner, H. Wenzel, Numerical and experimental investigations of DBR tapered lasers, The 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), May 20 - 23, 2010, Technical University of Moldova, Chisinau, Moldova, May 20, 2010.

V.Z. Tronciu, S.S. Rusu, C. Pîrtac, Dynamics of coupled semiconductor lasers. On/off phase shift keying encription method, The 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), Chisinau, Moldova, May 20 - 23, 2010.

V.Z. Tronciu, Chaos based communication using multi-section semiconductor laser, École Polytechnique Fédérale de Lausanne (EPFL-SB), Laboratory of Physics of Nanostructures, Switzerland, September 9, 2010.

V.Z. Tronciu, Nonlinear dynamics in semiconductor lasers --- Theory and experiments, Vrije Universiteit Brussel, Department of Applied Physics and Photonics, Belgium, September 16, 2010.

V.Z. Tronciu, Semiconductor laser a key element for new generation optoelectronic systems, The 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), May 20 - 23, 2010, Technical University of Moldova, Chisinau, Moldova, May 21, 2010.

A.G. Vladimirov, Introduction to mode-locking in lasers, Graduate College of the Collaborative Research Center SFB 787 ``Semiconductor Nanophotonics: Materials, Models, Devices'', May 9 - 11, 2010, Technische Universität Berlin, Institut für Festkörperphysik, Graal-Müritz, May 10, 2010.

A.G. Vladimirov, Locking characteristics of a 40 GHz hybrid mode-locked monolithic quantum dot laser, Conference on Semiconductor Lasers and Laser Dynamics IV within SPIE Photonics Europe 2010, April 12 - 16, 2010, Brussels, Belgium, April 14, 2010.

A.G. Vladimirov, Nonlinear dynamics in lasers, Technische Universität Berlin, Institut für Festkörperphysik, March 24, 2010.

U. Bandelow, Semiconductor laser instabilities and dynamics (short course), 10th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) 2010, September 6 - 9, 2010, Atlanta, USA, September 6, 2010.

U. Bandelow, Semiconductor lasers for high speed applications: Modeling and simulation, International Workshop on High Speed Semiconductor Lasers (HSSL 2010), October 7 - 8, 2010, Wroclaw University of Technology, Institute of Physics, Poland, October 7, 2010.

T. Girnyk, Multistability of twisted states in non-locally coupled Kuramoto-type models, Universität Potsdam, Institut für Physik und Astronomie, October 25, 2010.

T. Girnyk, Multistability of twisted states in non-locally coupled Kuramoto-type models, École Polytechnique Fédérale de Lausanne, Laboratory of Nonlinear Systems (EPFL-LANOS), Switzerland, November 17, 2010.

T. Girnyk, Stability of twisted states in repulsive Kuramoto models, Research Group Seminar, Freie Universität Berlin, research group ``Nonlinear Dynamics'', December 2, 2010.

M. Lichtner, Modeling and simulation of high power high brightness tapered and broad area lasers, Universität Potsdam, Mathematisch-Naturwissenschaftliche Fakultät, Institut für Physik und Astronomie, Arbeitsgruppe Photonik, Berlin, February 24, 2010.

M. Radziunas, Theoretical investigations of the pulse broadening in mode-locked quantum-dot semiconductor lasers, European Semiconductor Laser Workshop 2010, September 24 - 25, 2010, University of Pavia, Italy, September 24, 2010.

M. Wolfrum, Instabilities of laser devices, Doktorandenseminar des SFB 787 Halbleiter-Nanophotonik, Technische Universität Berlin, April 23, 2010.

M. Radziunas, LDSL-tool: a software for simulation and analysis of Longitudinal Dynamics in Semiconductor Lasers, Ferdinand-Braun-Institut für Höchstfrequenztechnik, Berlin, January 6, 2009.

M. Radziunas, Modeling, simulations and analysis of quantum-dot mode locked lasers, Minisymposium ``Nonlinear Dynamics in Quantum Dot Device'', November 9, 2009, WIAS, November 9, 2009.

M. Radziunas, Numerical bifurcation analysis for multi-section semiconductor lasers, International Workshop ``Trends in Bifurcation Analysis: Methods and Applications (TBA 2009)'', June 3 - 5, 2009, Milan, Italy, June 3, 2009.

M. Radziunas, Simulation and analysis of longitudinal dynamics in semiconductor laser devices, Tyndall National Institute, Photonics Theory Group, Cork, Ireland, June 25, 2009.

M. Radziunas, Simulation of switching between stable unidirectional states in semiconductor ring lasers, European Conference on Lasers and Electro-Optics and the XIth European Quantum Electronics Conference 2009 (CLEOtextsuperscript®/Europe -- EQEC 2009), Munich, June 14 - 19, 2009.

M. Radziunas, Traveling wave modeling and mode analysis of mode-locked quantum dot semiconductor lasers, European Semiconductor Laser Workshop 2009, September 25 - 26, 2009, Vienna University of Technology, Austria, September 26, 2009.

M. Radziunas, Traveling wave modeling of mode-locked quantum dot semiconductor lasers, European Conference on Lasers and Electro-Optics and the XIth European Quantum Electronics 2009 Conference (CLEO®/Europe-EQEC), June 15 - 19, 2009, Munich, June 16, 2009.

V.Z. Tronciu, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, M. Spreemann, Calculation of improved features of distributed-feedback tapered master-oscillator power-amplifiers, European Conference on Lasers and Electro-Optics and the XIth European Quantum Electronics Conference 2009 (CLEOtextsuperscript®/Europe -- EQEC 2009), Munich, June 14 - 19, 2009.

V.Z. Tronciu, Chaos based communication using multi-section semiconductor laser, Seminar of the DFG Collaborative Research Center (SFB) 787 ``Semiconductor Nanophotonics: Materials, Models, Devices'', Technische Universität Berlin, May 14, 2009.

V.Z. Tronciu, Dynamics and stability improvement of DFB tapered master-oscillator power-amplifiers, 6th International Conference on Microelectronics and Computer Science, October 1 - 3, 2009, Technical University of Moldova/Academy of Sciences of Moldova, Chisinau, Republic of Moldova, October 2, 2009.

V.Z. Tronciu, Dynamics of DFB tapered master-oscillator power-amplifiers. Applications, Seminar of the Laboratory of Theory of Semiconductors and Quantum Electronics, Academy of Sciences of Moldova, Institute of Applied Physics, Chisinau, October 9, 2009.

V.Z. Tronciu, Numerical simulations of DFB-MOPA and DBR tapered power-amplifiers, Photo Meeting, University of the Balearic Islands, Institute for Cross-Disciplinary Physics and Complex Systems (IFISC), Palma de Mallorca, Spain, June 26, 2009.

V.Z. Tronciu, Numerical simulations of DFB-MOPA and DBR tapered power-amplifiers, Universidad Politécnica de Madrid, Departamento de Tecnología Fotónica, Spain, June 29, 2009.

A.G. Vladimirov, Hybrid mode-locking in a 40 GHz monolithic quantum dot laser, European Conference on Lasers and Electro-Optics and the XIth European Quantum Electronics 2009 Conference (CLEO®/Europe-EQEC), June 14 - 19, 2009, Munich, June 16, 2009.

A. Wilms, E. Malic, J.-E. Kim, Th. Koprucki, A. Knorr, U. Bandelow, Microscopic model of semiconductor QD-gain, International Nano-Optoelectronic Workshop (iNOW 2009), Stockholm, Sweden, and Berlin, Germany, August 2 - 15, 2009.

A. Wilms, Gewinnspektren von Quantenpunkten, Doktorandenseminar des Graduiertenkollegs des SFB 787 "Halbleiter-Nanophotonik", Technische Universität Berlin, November 20, 2009.

U. Bandelow, 3D semiclassical multi-species modeling of QD lasers, International Nano-Optoelectronic Workshop (iNOW 2009), August 2 - 15, 2009, Royal Institute of Technology/Technical University of Berlin, Stockholm/Berlin, Sweden/Germany, August 14, 2009.

U. Bandelow, Improving the stability of distributed-feedback tapered master-oscillator power-amplifiers, 9th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) 2009, September 14 - 18, 2009, Gwangju Institute of Science and Technology (GIST), Republic of Korea, September 15, 2009.

U. Bandelow, Semiconductor laser instabilities and dynamics (short course), 9th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) 2009, September 14 - 18, 2009, Gwangju Institute of Science and Technology (GIST), Republic of Korea, September 16, 2009.

M. Radziunas, Numerical bifurcation analysis of a PDE model for multisection semiconductor lasers, Workshop ``Bifurcation in Dynamical Systems with Applications'', May 19 - 21, 2008, Universität Bielefeld, Fakultät für Mathematik, May 20, 2008.

M. Radziunas, Simulation of CW and CCW mode switching in semiconductor ring lasers, European Semiconductor Laser Workshop ESLW 2008, September 19 - 20, 2008, Technische Universiteit Eindhoven, The Netherlands, September 19, 2008.

M. Radziunas, Traveling wave modelling of seminconductor ring lasers, SPIE Photonics Europe Conference, April 7 - 10, 2008, Strasbourg, France, April 9, 2008.

A.G. Vladimirov, Bifurcation analysis of a model of passively mode-locked quantum dot laser, SPIE Photonics Europe Conference, April 7 - 10, 2008, Strasbourg, France, April 8, 2008.

A.G. Vladimirov, Delay differential models of passively mode-locked quantum dot lasers, Laser Optics 2008, June 23 - 28, 2008, St. Petersburg, Russia, June 25, 2008.

A.G. Vladimirov, Mode-locking in monolithic semiconductor lasers, University College Cork, Tyndall National Institute, Ireland, March 12, 2008.

U. Bandelow, Dynamic simulation of high brightness semiconductor lasers, 8th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) 2008, September 1 - 5, 2008, University of Nottingham, UK, September 2, 2008.

U. Bandelow, Modeling and analysis of master-oscillator power-amplifier seminconductor lasers, University of Washington, Seattle, USA, October 16, 2008.

U. Bandelow, Modellierung und Simulation von Halbleiterlasern, Graduate College of the Collaborative Research Center SFB 787 ``Semiconductor Nanophotonics: Materials, Models, Devices'', May 21 - 23, 2008, Technische Universität Berlin, Institut für Festkörperphysik, Graal-Müritz, May 23, 2008.

U. Bandelow, Quantum-classical coupling in multi quantum well lasers, 4th Workshop ``Mathematical Models for Transport in Macroscopic and Mesoscopic Systems'', February 7 - 10, 2008, WIAS, Berlin, February 8, 2008.

M. Lichtner, Modeling and parallel simulation of high power semiconductor lasers, PARA 2008: Workshop on State-of-the-Art in Scientific and Parallel Computing, Minisymposium on Applications of Parallel Computation in Industry and Engineering, May 13 - 16, 2008, Trondheim, Norway, May 14, 2008.

M. Radziunas, U. Troppenz, J. Kreissl, Tailoring single-mode DFB laser with integrated passive feedback section for direct modulation applications, European Conference on Lasers and Electro-Optics, 2007/International Quantum Electronics Conference (CLEO-IQEC 2007), Munich, June 17 - 22, 2007.

M. Radziunas, Simulation and analysis of the multimode model for semiconductor ring lasers, PHASE Conference, Metz, France, March 28 - 30, 2007.

M. Radziunas, Tailoring a passive feedback DFB laser for direct modulation applications, PHASE Conference, March 28 - 30, 2007, Metz, France, March 29, 2007.

M. Radziunas, Traveling wave modeling of semiconductor ring lasers, Workshop on Nonlinear Dynamics in Semiconductor Lasers, November 19 - 21, 2007, WIAS, Berlin, November 20, 2007.

M. Radziunas, Travelling wave modelling of the semiconductor ring lasers, European Semiconductor Lasers Workshop (ESLW 2007), September 14 - 15, 2007, Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, Berlin, September 14, 2007.

S. Yanchuk, Eckhaus instability in systems with large delay, International Conference on Differential Equations (EQUADIFF 07), August 5 - 11, 2007, Vienna University of Technology, Austria, August 7, 2007.

M. Radziunas, Tailoring a passive feedback DFB laser for direct modulation applications, Heinrich-Hertz-Institut, Berlin, April 17, 2007.

U. Bandelow, 40 Gbit/s direct modulation in DFB lasers with integrated feedback, Workshop on Nonlinear Dynamics in Semiconductor Lasers, November 19 - 21, 2007, WIAS, Berlin, November 20, 2007.

U. Bandelow, Efficient modeling and analysis of dynamical effects in semiconductor laser devices, University of Nottingham, George Green Institute, UK, July 6, 2007.

U. Bandelow, Enhanced modulation bandwidth by integrated feedback, Rio de la Plata Workshop on Noise, Chaos and Complexity in Lasers and Nonlinear Optics, December 3 - 6, 2007, Punta del Este, Uruguay, December 5, 2007.

U. Bandelow, Feedback enhanced modulation bandwidth, Dynamics Days Europe, University of Loughborough, UK, July 12, 2007.

U. Bandelow, Nichtlineare Effekte in Halbleiterlasern und optischen Fasern, Habilitandenkolloquium, Humboldt-Universität zu Berlin, Institut für Physik, April 17, 2007.

U. Bandelow, Semiconductor laser instabilities and dynamics (Short Course SC 0702), 7th International Conference ``Numerical Simulation of Optoelectronic Devices'' (NUSOD'07), University of Delaware, Newark, USA, September 25, 2007.

M. Lichtner, Modeling and simulation of high power laser diodes, Workshop on Nonlinear Dynamics in Semiconductor Lasers, November 19 - 21, 2007, WIAS, Berlin, November 20, 2007.

A. Vladimirov, Numerical bifurcation analysis of a mode-locked semiconductor laser, Workshop on Nonlinear Dynamics in Semiconductor Lasers, November 19 - 21, 2007, WIAS, Berlin, November 21, 2007.

A. Vladimirov, Passive mode-locking in quantum dot lasers, Joint Seminar on Quantum Optics, St. Petersburg State University and Herzen State Pedagogical University, Russia, December 26, 2007.

M. Radziunas, T. Köhler, ttfamily LDSL-tool: Simulation and analysis of dynamics in semiconductor lasers, Laser-Optik-Berlin, March 23 - 24, 2006.

M. Radziunas, Agreement between cavity modes in traveling wave and Lang--Kobayashi models of laser with delayed feedback, Cross-disciplinary Physics Seminar, Mediterranean Institute for Advanced Studies (IMEDEA), Palma de Mallorca, Spain, May 9, 2006.

M. Radziunas, External cavity modes in Lang-Kobayashi and traveling wave models, SPIE Conference Photonic Europe 2006, April 2 - 7, 2006, Strasbourg, France, April 5, 2006.

M. Radziunas, Reduction and numerical bifurcation analysis of a PDE model for multisection lasers, 6th Crimean School and Workshops ``Nonlinear Dynamics, Chaos and Applications'', May 15 - 26, 2006, Yalta, Crimea, Ukraine, May 22, 2006.

M. Radziunas, Simulation and analysis of the Traveling Wave model for multisection semiconductor lasers with LDSL-tool, WIAS-Day, Berlin, February 24, 2006.

M. Radziunas, Stabilization of orbits in semiconductor laser with external resonator, Workshop ``Complex Dynamics and Delay Effects in Coupled Systems'', September 11 - 13, 2006, Humboldt-Universität zu Berlin, September 12, 2006.

M. Radziunas, Traveling wave modeling of mode-locking in ring lasers, Workshop ``Nonlinear Dynamics in Modelocked Lasers and Optical Fibers'', July 13 - 14, 2006, WIAS, Berlin, July 14, 2006.

M. Lichtner, M. Radziunas, L. Recke, M. Wolfrum, Nonlinear dynamical effects in integrated optoelectronic structures, Evaluation Colloquium of the DFG Research Center sc Matheon, Berlin, January 24 - 25, 2006.

U. Bandelow, Modeling and simulation of optoelectronic devices, Kick-off Workshop ``Materials in New Light'', Humboldt-Universität zu Berlin, Institut für Physik, Berlin, January 6, 2006.

U. Bandelow, Modellierung und Simulation optoelektronischer Bauelemente, Berliner Industriegespräche, Deutsche Physikalische Gesellschaft, Magnus-Haus, Berlin, September 6, 2006.

U. Bandelow, Modellierung und Simulation von Pulsquellen, Status Seminar TerabitOptics Berlin, Heinrich-Hertz-Institut für Nachrichtentechnik, Berlin, July 4, 2006.

U. Bandelow, Multi-dimensional modeling and simulation of VCSELs, Project Meeting ''SFB Nanophotonics'', Technische Universität Berlin, September 1, 2006.

U. Bandelow, Simulation and analysis of spatio-temporal effects in complex laser structures, Kick-off Workshop ``Materials in New Light'', Humboldt-Universität zu Berlin, Institut für Physik, Berlin, January 6, 2006.

A. Glitzky, R. Nürnberg, U. Bandelow, ttfamily WIAS-TeSCA: Simulation of semiconductor lasers, Laser-Optik-Berlin, March 23 - 24, 2006.

M. Lichtner, A spectral gap mapping theorem and smooth invariant center manifolds for semilinear hyperbolic systems, 6th AIMS International Conference on Dynamical Systems, Differential Equations & Applications, June 25 - 28, 2006, Université de Poitiers, France, June 28, 2006.

A. Vladimirov, Dynamics of light pulses in mode-locked lasers, 6th Crimean School and Workshops ``Nonlinear Dynamics, Chaos and Applications'', May 15 - 26, 2006, Yalta, Crimea, Ukraine, May 20, 2006.

A. Vladimirov, Nonlinear dynamics and bifurcations in multimode and spatially distributed laser systems, June 20 - 23, 2006, St. Petersburg State University, Russia, June 20, 2006.

A. Vladimirov, Nonlinear dynamics in multimode and spatially extended laser systems, Moscow State University, Physics Faculty, Russia, November 10, 2006.

M. Radziunas, H.-J. Wünsche, V. Tronciu, Stability of continuous wave states in semiconductor laser with external resonator, Workshop on PHysics and Applications of SEmiconductor Lasers (PHASE 2005), Supélec --- Ecole Supérieure d'Electricité, Metz, France, March 29 - 30, 2005.

M. Radziunas, H.-J. Wünsche, Traveling-wave modeling of semiconductor lasers and amplifiers, 5th International Conference ``Numerical Simulation of Optoelectronic Devices'' (NUSOD 05), September 19 - 22, 2005, Humboldt-Universität, Berlin, September 19, 2005.

M. Radziunas, U. Bandelow, M. Wolfrum, A. Glitzky, R. Hünlich, U. Troppenz, J. Kreissl, Design of multisection semiconductor laser for 40 Gb/s direct modulation, 31st European Conference on Optical Communication ECOC 2005, Glasgow, UK, September 25 - 29, 2005.

M. Radziunas, Numerical bifurcation analysis of the traveling wave model of multisection semiconductor lasers, Workshop ``Qualitative Numerical Analysis of High-dimensional Nonlinear Systems'', March 21 - 24, 2005, University of Bristol, UK, March 23, 2005.

M. Radziunas, Reduction and numerical bifurcation analysis of the PDE model of multisection semiconductor lasers, Matheon Workshop on Model Reduction, Technische Universität, Berlin, November 7, 2005.

M. Radziunas, Simulation and analysis of the Traveling Wave model for multisection semiconductor lasers, Workshop ``Nonlinear Dynamics in Photonics'', May 2 - 4, 2005, WIAS, Berlin, May 4, 2005.

M. Radziunas, Stability of continuous wave states in semiconductor laser with external resonator, Minisymposium ``Laser + Resonator'', WIAS, Berlin, February 17, 2005.

M. Radziunas, Tailoring the dynamics of multisection lasers for 40 Gb/s direct modulation, 5th International Conference ``Numerical Simulation of Optoelectronic Devices'' (NUSOD 05), September 19 - 22, 2005, Humboldt-Universität, Berlin, September 20, 2005.

M. Radziunas, Tailoring the dynamics of multisection lasers for 40 Gb/s direct modulation, Evaluation of DIMOLA-Project, Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, Berlin, May 18, 2005.

M. Radziunas, Tayloring the dynamics of multisection semiconductor lasers for 40 Gbit/s direct modulation, European Semiconductor Laser Workshop (ESLW) 2005, September 23 - 24, 2005, Glasgow, UK, September 24, 2005.

A. Vladimirov, D. Turaev, D. Rachinskii, Delay differential models of mode-locking in semiconductor lasers, International Conference on Coherent and Nonlinear Optics, May 11 - 16, 2005, St. Petersburg, Russia, May 14, 2005.

A. Vladimirov, 40 GHz modelocking in monolithic semiconductor lasers, WIAS-Day, Berlin, February 23, 2005.

A. Vladimirov, Theoretical analysis of dynamical instabilities in a mode-locked semiconductor laser, Workshop ``Nonlinear Dynamics in Photonics'', May 2 - 4, 2005, WIAS, Berlin, May 3, 2005.

S. Yanchuk, Appearance of patterns in delay coupled laser arrays, Universität Potsdam, January 31, 2005.

S. Yanchuk, Properties of the Lang-Kobayashi model with large delay, Workshop ``Nonlinear Dynamics in Photonics'', May 2 - 4, 2005, WIAS, Berlin, May 2, 2005.

M. Nizette, A. Vladimirov, M. Wolfrum, D. Rachinskii, Delay differential equations for passive mode-locking, International Quantum Electronics Conference, München, June 12 - 17, 2005.

U. Bandelow, Analyse dynamischer Effekte in Optoelektronik und Photonik, Institutsseminar, Ferdinand-Braun-Institut für Höchstfrequenztechnik, Berlin, December 9, 2005.

U. Bandelow, Modellierung und Simulation von Pulsquellen, Status Seminar of the Terabit-Optics-Berlin Project, Fraunhofer Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, Berlin, May 31, 2005.

U. Bandelow, Reduced amplitude noise in monolithic mode-locked semiconductor lasers, Workshop on PHysics and Applications of SEmiconductor Lasers (PHASE 2005), March 29 - 30, 2005, Supélec --- Ecole Supérieure d'Electricité, Metz, France, March 30, 2005.

M. Wolfrum, Synchronous and asynchronous instabilities of two lasers with a long delayed coupling, EUROMECH Nonlinear Dynamics Conference (ENOC 2005), August 7 - 12, 2005, Eindhoven, The Netherlands, August 8, 2005.

M. Radziunas, Forced locking in multimode semiconductor lasers, WIAS Workshop ``Synchronization and High-dimensional Chaos in Coupled Systems'', November 15 - 16, 2004, Berlin, November 16, 2004.

M. Radziunas, Simulation and analysis of 40 GHz monolithic mode-locked lasers, Joint International Workshop OPTIMIST, EPIC and COST288, October 17 - 20, 2004, Università ``La Sapienza'', Rome, Italy, October 20, 2004.

S. Yanchuk, Dynamics of two F2F coupled lasers: Instantaneous coupling limit, SPIE Photonics Europe 2004 Conference ``Semiconductor Lasers and Laser Dynamics'', April 27 - 30, 2004, Strasbourg, France, April 28, 2004.

S. Yanchuk, Intermittent synchronization in a system of coupled lasers, WIAS Workshop ``Synchronization and High-dimensional Chaos in Coupled Systems'', November 15 - 16, 2004, Berlin, November 15, 2004.

U. Bandelow, M. Radziunas, Time domain simulation of 40 GHz mode-locked semiconductor lasers, WIAS Mini-Symposium on Mode-locked Semiconductor Lasers, March 22 - 23, 2004, Berlin, March 22, 2004.

U. Bandelow, 40 GHz mode-locked semiconductor lasers: Theory, simulation and experiments, Annual Meeting 2004 of the Optical Society of America (OSA) ``Frontiers in Optics'', October 10 - 14, 2004, Rochester, USA, October 11, 2004.

U. Bandelow, Modeling of 40 GHz mode-locked semiconductor lasers, European Semiconductor Laser Workshop (ESLW'04), September 2 - 4, 2004, Chalmers University of Technology, Department of Microtechnology and Nanoscience, Särö, Sweden, September 4, 2004.

U. Bandelow, Modellierung und Simulation von Pulsquellen, Status Seminar of the Terabit-Optics-Berlin Project, Technische Universität Berlin, May 3, 2004.

U. Bandelow, Modellierung und Simulation von Pulsquellen, Status Seminar of the Terabit-Optics-Berlin Project, Technische Universität Berlin, November 2, 2004.

U. Bandelow, Time-domain modeling of ps-OEIC, Joint International Workshops OPTIMIST, EPIC and COST288, June 2 - 4, 2004, Athens, Greece, June 3, 2004.

A.G. Vladimirov, D. Turaev, G. Kozyrev, Delay differential equations for a passively mode-locked laser, EPS-QEOD Europhoton Conference on Solid State and Fiber Coherent Light Sources, August 29 - September 3, 2004, European Physical Society, Lausanne, Switzerland, August 31, 2004.

A.G. Vladimirov, DDE-based modelling of passively mode-locked 40 GHz semiconductor lasers, WIAS Mini-Symposium on Mode-locked Semiconductor Lasers, March 22 - 23, 2004, Berlin, March 22, 2004.

U. Bandelow, M. Radziunas, Simulation of mode-locked lasers with LDSL-tool, European Quantum Electronics Conference (EQEC 2003), June 23 - 27, 2003, München, June 26, 2003.

U. Bandelow, Modeling and simulation of mode-locked lasers, WIAS Minisymposium on Pulse Generation in Laser Diodes, Berlin, June 12, 2003.

U. Bandelow, Report on WIAS activities concerning COST Action 288, Kick-off Meeting for the Cost Action 288, COST TIST Secretariat, Brussels, Belgium, April 7, 2003.

U. Bandelow, Simulation of 40 GHz mode-locked multisection DBR lasers, European Semiconductor Laser Workshop (ESLW'03), September 19 - 20, 2003, Torino, Italy, September 20, 2003.

U. Bandelow, Simulation of mode-locked lasers based on a distributed time-domain model, WIAS Workshop ``Dynamics of Semiconductor Lasers'', September 15 - 17, 2003, Berlin, September 17, 2003.

U. Bandelow, Thermodynamic designed energy model, 3rd Topical meeting on Numerical Simulation of Semiconductor Optoelectronic Devices (NUSOD'03), October 14 - 16, 2003, University of Tokyo, Japan, October 14, 2003.

M. Radziunas, Computation of the stationary states of traveling wave laser model and their analysis, WIAS Workshop ``Multiscale Systems and Applications'', April 3 - 5, 2003, Berlin, April 5, 2003.

M. Radziunas, Dynamics of longitudinal modes in multisection semiconductor lasers, WIAS Workshop ``Dynamics of Semiconductor Lasers'', September 15 - 17, 2003, Berlin, September 15, 2003.

M. Radziunas, Forced periodic frequency locking: Application of path-following tools, WIAS Workshop ``Dynamical Systems, Synchronization, Lasers'', February 26 - 27, 2003, Berlin, February 27, 2003.

M. Radziunas, Numerical bifurcation analysis of the PDE system describing dynamics in multi-section semiconductor laser, The European Conference on Numerical Mathematics and Advanced Applications (ENUMATH 2003), August 18 - 22, 2003, Prague, Czech Republic, August 21, 2003.

S. Bauer, O. Brox, M. Biletzke, J. Kreissl, M. Radziunas, B. Sartorius, H.-J. Wünsche, Speed potential of active feedback lasers, CLEO/Europe-EQEC 2003, München, July 22 - 27, 2003.

M. Lichtner, M. Radziunas, L. Recke, J. Rehberg, K.R. Schneider, D8 -- Nichtlineare dynamische Effekte in integrierten optoelektronischen Strukturen, MathInside---Überall ist Mathematik, event of the DFG Research Center ``Mathematics for Key Technologies'' on the occasion of the Open Day of Urania, Berlin, September 13, 2003 - September 27, 2000.

K.R. Schneider, Bifurcation in mode approximation models of semiconductor lasers, Grodno State University, Faculty of Mathematics, Belarus, December 3, 2003.

K.R. Schneider, Modeling of the longitudinal dynamics of semiconductor lasers, 8th International Conference ``Mathematical Modelling and Analysis 2003'' (MMA), ECMI, May 28 - 31, 2003, Vilnius, Lithuania, May 29, 2003.

A. Vladimirov, A new DDE model for passive mode-locking, WIAS Workshop ``Dynamics of Semiconductor Lasers'', September 15 - 17, 2003, Berlin, September 17, 2003.

A. Vladimirov, Passive mode-locking in semiconductor lasers, Institute for Laser Physics, St. Petersburg, Russia, December 25, 2003.

M. Wolfrum, Instabilities of semiconductor lasers with delayed optical feedback, Workshop ``Delay Equations and Applications'', September 8 - 11, 2003, Bristol, UK, September 10, 2003.

S. Yanchuk, Synchronization of two mutually coupled semiconductor lasers: Instantaneous coupling limit, WIAS Workshop ``Dynamics of Semiconductor Lasers'', September 15 - 17, 2003, Berlin, September 16, 2003.

S. Yanchuk, Synchronization phenomena in semiconductor laser, Sfb 555 Workshop ``Complex Nonlinear Processes'', September 11 - 13, 2003, Berlin, September 12, 2003.

S. Yanchuk, Synchronization of two coupled Lang-Kobayashi systems, National Institute of Applied Optics, Florence, Italy, May 7, 2003.

S. Yanchuk, Synchronization problem in two-section semiconductor lasers, Forschungsseminar ``Angewandte Analysis'', Humboldt-Universität zu Berlin, Institut für Mathematik, July 7, 2003.

M. Radziunas, Analysis and simulation of active feedback lasers, Minisymposium ``DFB Laser with Amplifying Feedback'', WIAS, Berlin, November 28, 2002.

M. Radziunas, Dynamics of multi-section DFB semiconductor laser: Traveling wave and mode approximation models, Physics and Simulation of Optoelectronics Devices X, January 21 - 25, 2002, San Jose, California, USA, January 21, 2002.

M. Radziunas, Excitability of a DFB laser with short external cavity, Physics and Simulation of Optoelectronics Devices X, San Jose, California, USA, January 24, 2002.

M. Radziunas, LDSL: A tool for simulation and analysis of longitudinal dynamics in multisection semiconductor lasers, International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices (NUSOD-02), September 25 - 27, 2002, Eidgenössische Technische Hochschule Zürich, Switzerland, September 25, 2002.

M. Radziunas, Numerical bifurcation analysis of PDE system describing dynamics in multi-section semiconductor laser, Dynamical Methods for Differential Equations, September 4 - 7, 2002, Medina del Campo, Spain, September 6, 2002.

M. Radziunas, Simulation and analysis of dynamics in multi-section semiconductor DFB laser, First SIAM-EMS Conference ``Applied Mathematics in our Changing World'', September 3 - 6, 2001, Berlin, September 3, 2001.

M. Radziunas, Traveling wave model and its mode approximations analyzing and designing semiconductor lasers, WIAS Workshop ``Dynamics of Semiconductor Lasers'', September 13 - 15, 2001, Berlin, September 14, 2001.

H. Gajewski, U. Bandelow, H. Stephan, K.R. Schneider, M. Radziunas, M. Wolfrum, J. Sieber, F. Jochmann, L. Recke, Modellierung von Halbleiterlasern --- Strukturbildung in Raum und Zeit, Evaluation of Sfb 555 ``Complex Nonlinear Processes'', Humboldt-Universität zu Berlin, April 5, 2001 - September 27, 2000.

M. Radziunas, K.R. Schneider, Tayloring of semiconductor lasers for optical communicator networks, 3rd International Symposium "`Investigation of Nonlinear Dynamic Effects in Production Systems"', Brandenburgische Technische Universität Cottbus, September 26 - 27, 2000.

M. Radziunas, Modelling of multisection semiconductor lasers, International Colloquium "`Applications of Mathematics"', September 29 - 30, 2000, Hamburg, September 29, 2000.

M. Schulz-Ruhtenberg, I. Babushkin, N.A. Loiko, K.F. Huang, T. Ackemann, Polarization properties in the transition from below to above lasing threshold in broad-area vertical-cavity surface-emitting lasers (electronic only), Preprint no. arXiv:0909.3812, Cornell University Library, arXiv.org, 2009.
Abstract

For highly divergent emission of broad-area vertical-cavity surface-emitting lasers (VCSELs) a rotation of the polarization direction by up to 90 degrees occurs when the pump rate approaches the lasing threshold. Well below threshold the polarization is parallel to the direction of the transverse wave vector and is determined by the transmissive properties of the Bragg reflectors that form the cavity mirrors. In contrast, near-threshold and above-threshold emission is more affected by the reflective properties of the reflectors and is predominantly perpendicular to the direction of transverse wave vectors. Two qualitatively different types of polarization transition are demonstrated: an abrupt transition, where the light polarization vanishes at the point of the transition, and a smooth one, where it is significantly nonzero during the transition.

I. Babushkin, Scar-like structures and non-integrability in a perfectly square optical billiard (electronic only), Preprint no. arXiv:0909.4330, Cornell University Library, arXiv.org, 2009.
Abstract

We show that scar-like structures (SLS) in a wide aperture vertical cavity surface emitting laser (VCSEL) can be formed even in a perfectly square geometry due to interaction of polarization and spatial degrees of freedom of light. We show also that dissipation in the system induces an order among the cavity modes, so that SLS become preferred at lasing threshold. More generally, modes which are more localized both in coordinate and momentum space have in average lower losses.