Abstract
A new class of distributed feedback (DFB) semiconductor lasers is reviewed, which incorporates a periodic variation in gain coefficient. Intrinsic single mode nature and reflection immunity are great advantages of the gain-coupled (GC) DFB laser. Moreover, its carrier- density-dependent dynamic resonator provides a capability of generating short optical pulses with very low chirping. Recent experimental results of research on the GC DFB laser are presented.
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