PPM demodulation: On approaching fundamental limits of optical communications

Details PPM demodulation: On approaching fundamental limits of optical communications PPM demodulation: On approaching fundamental limits of optical communications

2010-01-14

arxiv.org/abs/1001.2447v2

Journal of Modern Optics, Volume 58 Issue 3, 257, 2011

Physics

Quantum Physics

5 pages, 6 figures, IEEE ISIT, Austin, TX (2010)

Scientific paper

10.1080/09500340.2010.533204

We consider the problem of demodulating M-ary optical PPM (pulse-position modulation) waveforms, and propose a structured receiver whose mean probability of symbol error is smaller than all known receivers, and approaches the quantum limit. The receiver uses photodetection coupled with optimized phase-coherent optical feedback control and a phase-sensitive parametric amplifier. We present a general framework of optical receivers known as the conditional pulse nulling receiver, and present new results on ultimate limits and achievable regions of spectral versus photon efficiency tradeoffs for the single-spatial-mode pure-loss optical communication channel.

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