Title :
Simple formula giving spectrum-narrowing ratio of semiconductor-laser output obtained by optical feedback
Author :
Kikuchi, K. ; Okoshi, T.
Author_Institution :
University of Tokyo, Department of Electronic Engineering, Tokyo, Japan
Abstract :
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.
Keywords :
III-V semiconductors; aluminium compounds; feedback; gallium arsenide; laser theory; semiconductor junction lasers; 3 dB spectra width; GaAlAs laser; optical feedback; optical feedback power ratio; semiconductor-laser output; spectrum-narrowing ratio;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19820008
