WIAS Preprint No. 2438, (2017)

Tunable semiconductor ring laser with filtered optical feedback: Traveling wave description and experimental validation


  • Radziunas, Mindaugas
    ORCID: 0000-0003-0306-1266
  • Khoder, Mulham
  • Tronciu, Vasile
  • Danckaert, Jan
  • Verschaffelt, Guy

2010 Mathematics Subject Classification

  • 78A60 35Q60 78-05, 78-04

2008 Physics and Astronomy Classification Scheme

  • 42.55.Px, 42.60.Da, 42.60.Fc, 42.65.Pc, 42.65.Sf, 02.30.Jr, 02.60.Cb


  • Semiconductor ring lasers, optical feedback, wavelength filtering, tunable lasers, traveling wave model, longitudinal modes, mode switching




We study experimentally and theoretically a semiconductor ring laser with four filtering channels providing filtered delayed optical feedback. To describe and analyze the wavelength selection and tuning in this device, we exploit the traveling-wave model determining the evolution of optical fields and carrier density along the ring cavity and filtering branches. The numerical results agree with the experimental observations: we can reproduce the wavelength tuning, the multiple wavelength emission, and the wavelength switching speed measured in these devices. The traveling-wave model allows us to study in detail the effect of the different laser parameters and can be useful for designing the future devices.

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