Laser phase-induced Intensity noise (PIIN) has held interest for several years due to the importance of its power spectrum in estimating laser linewidths via delayed self-heterodyne and self-homodyne techniques.1 More recently, interest in PIIN has been renewed by observations that, as a parasitic effect in multipath fiber-optic communication systems, it can generate significantly elevated error rate floors.2,3

© 1989 Optical Society of America

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