Abstract
We consider the performance of quadratically detected heterodyned lightwave signals in the presence of a laser's relaxation oscillations. Here the limiting form of the channel presents both additive white Gaussian noise (AWGN) of spectral density N/sub 0/ and the laser's phase noise. The widely accepted model for the laser's phase noise is a Brownian motion giving rise to a Lorentzian line spectrum. However, the actual line shape of semiconductor lasers deviates from this simplified and idealized statistical characterization. The analytical techniques provided here show that this deviation may have a significant impact on the communication-system performance.
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