Abstract
Coherent lightwave systems can transmit hundreds of optical signals through a single fiber. Two fundamental problems face this technology: (a) laser phase noise and (b) polarization fluctuations of optical signals after propagation through single-mode fibers. To resolve these problems, diversity and double-filtering techniques have been proposed and investigated. Currently, research emphasis is shifting toward uses of coherent technology ranging from simple point-to-point systems to multichannel multiple access systems. The latter application requires the solution of a variety of challenging problems, such as the absolute and relative frequency stabilization of the laser sources.
© 1990 Optical Society of America
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