Intensive research in coherent optical communications showed that several serious problems have to be solved before this technology becomes practical. Diversity techniques can provide remedies for several of these problems: large receiver bandwidth requirements; phase noise of the transmitter and local oscillator (LO) lasers; limited tuning range and intensity noise of local oscillators; and polarization fluctuations of the received signals. This paper summarizes the progress made in the various coherent diversity techniques during the last few years.

© 1989 Optical Society of America

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