Abstract
Because of its narrow linewidth and wide tuning range, external cavity semiconductor lasers have been widely developed and applied in fields such as high resolution, optical spectrum measurement, heterodyne sensor, coherent optical fiber communication, coherent detection and optoelectronic detection. With a strongly coupled external cavity, i.e. the external cavity optical feedback is stronger than that from the cleaved facet of laser diode (by AR-coating laser facet), the lasing mode will be dominantly controlled by the external cavity. The analysis result reported in this paper shows that, there exists a device parameter decided stability limit condition, which depends on the feedback ratio and length of external feedback. Technical methods cannot exceed this limit condition.
© 1996 Optical Society of America
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