TY - JOUR
T1 - PMD compensation in polarization-multiplexed multilevel modulations by turbo equalization
AU - Minkov, Lyubomir L.
AU - Djordjevic, Ivan B.
AU - Xu, Lei
AU - Wang, Ting
N1 - Funding Information:
Manuscript received June 03, 2009; revised July 15, 2009. First published September 09, 2009; current version published November 18, 2009. This work was supported in part by the NSF under Grant IHCS 0725405, and in part by NEC Laboratories America. L. L. Minkov and I. B. Djordjevic are with the Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ 85721 USA (e-mail: [email protected]; [email protected]). L. Xu and T. Wang are with NEC Laboratories America, Princeton, NJ 08540 USA (e-mail: [email protected]; [email protected]). Color versions of one or more of the figures in this letter are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/LPT.2009.2031087
PY - 2009/12/1
Y1 - 2009/12/1
N2 - We propose the multilevel maximum a posteriori probability (MAP) detector suitable for use in polarization-multiplexed optical communications using multilevel modulation and coherent detection. The proposed multilevel MAP detection scheme considers two symbols transmitted over two orthogonal polarization states as a two-component symbol. We demonstrate experimentally that the proposed MAP scheme is effective in eliminating the bit-error-ratio (BER) floor phenomenon introduced by the conventional MAP equalizer, which considers the symbols transmitted over both polarizations independently. To improve further tolerance to optical fiber polarization-mode dispersion, we iterate extrinsic soft information between the MAP detector and soft-iterative decoder, in a turbo equalization fashion. Penalty of less than 1.5 dB at 20 Gb/s (and BER of 10-6) for differential group delay of 100 ps is reported.
AB - We propose the multilevel maximum a posteriori probability (MAP) detector suitable for use in polarization-multiplexed optical communications using multilevel modulation and coherent detection. The proposed multilevel MAP detection scheme considers two symbols transmitted over two orthogonal polarization states as a two-component symbol. We demonstrate experimentally that the proposed MAP scheme is effective in eliminating the bit-error-ratio (BER) floor phenomenon introduced by the conventional MAP equalizer, which considers the symbols transmitted over both polarizations independently. To improve further tolerance to optical fiber polarization-mode dispersion, we iterate extrinsic soft information between the MAP detector and soft-iterative decoder, in a turbo equalization fashion. Penalty of less than 1.5 dB at 20 Gb/s (and BER of 10-6) for differential group delay of 100 ps is reported.
KW - High-speed optical transmission
KW - Multilevel modulation
KW - Polarization-mode dispersion (PMD)
KW - Turbo equalization
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U2 - 10.1109/LPT.2009.2031087
DO - 10.1109/LPT.2009.2031087
M3 - Article
AN - SCOPUS:74549222232
SN - 1041-1135
VL - 21
SP - 1773
EP - 1775
JO - IEEE Photonics Technology Letters
JF - IEEE Photonics Technology Letters
IS - 23
M1 - 5233794
ER -