Abstract
It is well known that external optical feedback induces excess intensity noise and unstable operation in semiconductor lasers. A large number of theoretical and experimental investigations has been reported to explain the feedback-induced phenomena, including our analysis based on the mode competition theory.1 Moreover, it has been experimentally shown that conventional DFB lasers having an index coupling grating are more sensitive to external feedback than Fabry-Perot type lasers,2 but DFB lasers with the gain coupling grating are less sensitive than the index coupled DFB lasers.3-4 We theoretically compare in this paper the feedback sensitivity among Fabry-Perot, index coupled, and gain coupled DFB lasers.
© 1992 Optical Society of America
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