WIAS Preprint No. 1149, (2006)

Improving the modulation bandwidth in semiconductor lasers by passive feedback


  • Radziunas, Mindaugas
  • Glitzky, Annegret
  • Bandelow, Uwe
    ORCID: 0000-0003-3677-2347
  • Wolfrum, Matthias
  • Troppenz, Ute
  • Kreissl, Jochen
  • Rehbein, Wolfgang

2010 Mathematics Subject Classification

  • 78A60 35B35 37L65 35B60 35-04

2008 Physics and Astronomy Classification Scheme

  • 42.60.Fc 42.30.Lr 42.55.Px 73.40.-c


  • semiconductor laser, passive feedback, modulation bandwidth, direct modulation, damping, small signal response, large signal response, eye diagram


We explore the concept of passive-feedback lasers for direct signal modulation at 40 Gbit/s. Based on numerical simulation and bifurcation analysis, we explain the main mechanisms in these devices which are crucial for modulation at high speed. The predicted effects are demonstrated experimentally by means of correspondingly designed devices. In particular a significant improvement of the modulation bandwidth at low injection currents can be demonstrated.

Appeared in

  • IEEE JSTQE 13(1), pp 136-142, 2007.

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