Abstract

A single-mode fiber actually propagates two modes with their respective states of polarization. Due to birefringence, these two polarization modes will have slightly different group velocities, and hence they may interfere.1 This interference gives rise to fluctuations of the microbending loss which appears as unwanted noise. Nonlinear distortion may also occur since there is a simultaneous modulation of the laser diode frequency and of the polarization selective loss.2 In this paper, theoretical results are presented for the worst-case de signal to noise ratio (dc-SNR) and the relative second harmonic distortion R2|| due to microbending in single-mode fiber systems.

© 1985 Optical Society of America

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