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Theory and Experiment of High-Speed Cross-Gain Modulation in Semiconductor Lasers
Journal of Quantum Electronics
  • Xiaomin Jin, University of Illinois at Urbana-Champaign
  • T. Keating, University of Illinois at Urbana-Champaign
  • Shun-Lien Chuang, University of Illinois at Urbana-Champaign
Publication Date
We present theory and experiment for the high-speed modulation response of a quantum-well (QW) laser in the presence of an external microwave modulated optical pump in the gain region. The model includes the effects of pump-induced stimulated recombination and cross-gain saturation. Expressions for the small-signal modulation response of the test laser under gain modulation are derived. We also present experimental results using a multiple-QW InGaAlAs Fabry-Perot (FP) laser at 1.552 μm as the test laser and an external pump by a 1.542 μm DFB laser. Comparison between electrical modulation and optical cross-gain modulation (XGM) of the test laser is also presented, which shows improvement of the modulation bandwidth by optical XGM. Our data show a reduction of carrier lifetime with increasing optical pumping, a shift of the test-laser threshold current, a change in the K factor, and a variation of the relaxation frequency with different pump powers. The experimental results agree very well with the theoretical results
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Citation Information
Xiaomin Jin, T. Keating and Shun-Lien Chuang. "Theory and Experiment of High-Speed Cross-Gain Modulation in Semiconductor Lasers" Journal of Quantum Electronics Vol. 36 Iss. 12 (2000) p. 1485 - 1493
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