Effect of in-phase and antiphase gain coupling on high-speed properties of MQW DFB lasers

Effect of in-phase and antiphase gain-coupling on high-speed properties is studied for MQW DFB lasers with periodically truncated quantum-wells. The enhancement of modulation bandwidth due to antiphase gain-coupling is found significantly suppressed, and gain-coupled DFB lasers with high /spl kappa/L are preferred for large modulation bandwidth due to the presence of linear gain saturation in MQW lasers.<
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