R. S. Vodhanel, J. L. Gimlett, R. D. Standley, and N. K. Cheung
With recent progress in lightwave technology, optical heterodyne and homodyne detection methods, commonly referred to as coherent communications, are becoming increasingly viable. The techniques are important to future lightwave communications systems because they offer substantially higher receiver sensitivity, as well as the ability to tune to a large number of channels with small frequency separation.
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