Abstract

A critical problem facing the application of simple monolithic semiconductor lasers in coherent lightwave systems is the effect of optical feedback on the spectra of these lasers.1 It has been observed that feedback levels as small as -80 dB can significantly narrow or broaden the laser linewidth. Lasers operating cw exhibit a rich variety of feedback effects, which can be categorized into five distinct regimes, depending on the feedback level and the distance to the reflection2:

© 1988 Optical Society of America

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