We have recently observed that the Fabry-Perot cavities formed by index discontinuities in connectors and other fiber-optic components convert the intrinsic phase noise of semiconductor lasers into excess intensity noise which can significantly impact both direct detection and coherent communication systems. The level of this noise can be higher than −100 dB/Hz and can result in bit-error-rate (BER) floors.

© 1988 Optical Society of America

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