Abstract

We demonstrate that the amount of self-phase modulation in a coherent optical transmission system grows more slowly for a phase-modulated than for an amplitude-modulated signal. Signal degradation is discussed in terms of variations in the spectral contents of the amplitude and phase modulations, and explicit analytical expressions are given for the linear modulation indices of phase and amplitude of phase-shift keying coherent transmission systems.

© 1988 Optical Society of America

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