Abstract
Coherent detection techniques offer potential sensitivity improvements of ~20 dB over the best presently available direct-detection receivers for digital optical fiber systems in the 1.5-1.6μm transmission window of silica fiber. The performance advantage gained in this way can provide either increased regenerator separation at the same bit rate as the direct-detection system or higher data rates over the same length of link. However, to realize these gains a more complicated design of transmitter and receiver is required. We shall examine the benefits available from coherent detection in detail and the requirements for the necessary components at the transmitter and receiver to achieve these results. Recent experimental measurements will be presented, both for individual components and on complete systems, where sensitivities within 3 dB of those theoretically expected for quantum limited operation are obtained.
© 1983 Optical Society of America
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