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Eight years have passed since the first demonstration of semiconductor gain-coupled (GC) distributed-feedback (DFB) lasers.1 During this period, a number of advantages of the GC and CC (complex-coupled) DFB lasers over the conventional index-coupled (IC) ones have been set forth.2 Those advantages sound, however, somewhat optimistic when people come across a serious question whether they should manufacture it.3
© 1996 Optical Society of America
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