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Simple formula giving spectrum-narrowing ratio of semiconductor-laser output obtained by optical feedback

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2 Author(s)
Kikuchi, K. ; University of Tokyo, Department of Electronic Engineering, Tokyo, Japan ; Okoshi, T.

The letter presents a theory of the spectrum-narrowing effect of semiconductor lasers by optical feedback. A simple formula for the 3 dB spectral width is derived as a function of the intensity and phase of the returning beam and the round-trip time of the feedback circuit. The spectrum-narrowing ratio of a GaAlAs laser with a small amount of optical feedback was measured as a function of the optical feedback power ratio. The derived formula and experiment show very good agreement.

Published in:

Electronics Letters  (Volume:18 ,  Issue: 1 )