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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 26,
  • Issue 13,
  • pp. 1817-1822
  • (2008)

Evaluation of Sensitivity of the Digital Coherent Receiver

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Abstract

In this paper, we investigate the sensitivity of the digital coherent receiver both theoretically and experimentally. The receiver sensitivity close to the shot-noise limit is demonstrated in the 10-Gbit/s binary phase-shift keying system with the help of a low-noise optical preamplifier. We also introduce polarization diversity into our receiver. Maximal-ratio polarization combining in the digital domain makes the receiver sensitivity independent of the state of polarization of the incoming signal without power penalty.

© 2008 IEEE

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