A hybrid-fiber coax (HFC) system-based bidirectional CATV communication network relies on the performance of both downstream and upstream optical fiber links. Large (AM-VSB) channel-count, high- power downstream optical fiber transmitters have been commercialized for a few years, and the fundamental capacity of a downstream distributed feedback (DFB) laser has also been extensively studied.1–3

© 1997 Optical Society of America

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