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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 30, Iss. 4 — Feb. 12, 2012
  • pp: 406–413

Demonstration of Record Sensitivities in Optically Preamplified Receivers by Combining PDM-QPSK and M-Ary Pulse-Position Modulation

Xiang Liu, Thomas H. Wood, Robert W. Tkach, and S. Chandrasekhar

Journal of Lightwave Technology, Vol. 30, Issue 4, pp. 406-413 (2012)


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Abstract

We present the principle, implementation, and performance of a recently introduced high-sensitivity modulation format based on the combined use of polarization-division-multiplexed quadrature phase-shift keying (PDM-QPSK, or PQ) and m-ary pulse-position modulation (m-PPM). This novel modulation format, termed PQ-mPPM, offers high receiver sensitivity in optically preamplified receivers. We study the sensitivity of the PQ-mPPM format both analytically and experimentally, and compare it to common modulation formats such as PDM-QPSK, m-PPM, differential phase-shift keying, and polarization-switched QPSK. The bandwidth expansion factor of this format is also discussed. A record sensitivity of 3.5 photons per bit at BER = 10<sup>-3</sup> is experimentally demonstrated at 2.5 Gb/s with a novel pilot-assisted digital coherent-detection scheme, outperforming PDM-QPSK by about 3 dB.

© 2011 IEEE

Citation
Xiang Liu, Thomas H. Wood, Robert W. Tkach, and S. Chandrasekhar, "Demonstration of Record Sensitivities in Optically Preamplified Receivers by Combining PDM-QPSK and M-Ary Pulse-Position Modulation," J. Lightwave Technol. 30, 406-413 (2012)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-30-4-406

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