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Spectral Correlation Of Semiconductor Lasers

A novel technique for measuring the spectral properties of single-mode, semiconductor lasers for use in coherent optical communication systems is being explored. Unlike conventional linewidth/lineshape measurements both amplitude and phase information is retained in a complex spectral correlation function. In principle this should give additional insight into both the amplitude noise and phase noise processes within the laser that determine lineshape. The paper discusses the method and the problems involved.