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Opt Express. 2011 Dec 12;19(26):B836-41. doi: 10.1364/OE.19.00B836.

A comparison of modulation formats for passive optical networks.

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  • 1Optical Networks Group, UCL Electronic & Electrical Engineering, Torrington Place, London, WC1E 7JE, United Kingdom.


The sensitivity of the four-dimensional modulation format, polarization-switched quadrature phase shift keying (PS-QPSK), is compared with polarization division multiplexed QPSK (PDM-QPSK), binary phase shift keying (PDM-BPSK) and 8-ary quadrature amplitude modulation (PDM-8QAM) at a constant bitrate (12.5 Gbit/s) using a preamplified signal to improve receiver sensitivity. The sensitivity without preamplification is also obtained. PS-QPSK is found to maintain a sensitivity advantage over the reference formats in line with theory with an absolute sensitivity of -52.7 dBm (4.2 photons/bit), assuming hard decision FEC.

© 2011 Optical Society of America

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