Digital back-propagation for spectrally efficient WDM 112 Gbit/s PM m-ary QAM transmission | Zendy

Danish Rafique | Zendy; Jian Zhao | Zendy; A.D. Ellis | Zendy

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Digital back-propagation for spectrally efficient WDM 112 Gbit/s PM m-ary QAM transmission

Author(s) -

Danish Rafique,

Jian Zhao,

A.D. Ellis

Publication year - 2011

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.19.005219

Subject(s) - quadrature amplitude modulation , optics , wavelength division multiplexing , qam , transmission (telecommunications) , channel spacing , modulation (music) , multiplexing , physics , polarization mode dispersion , telecommunications , dispersion (optics) , computer science , channel (broadcasting) , bit error rate , wavelength , acoustics

We report the performance of coherently-detected nine-channel WDM transmission over high dispersion fibers, using polarization multiplexed m-ary quadrature amplitude modulation (m=4, 16, 64, 256) at 112 Gbit/s. Compensation of fiber nonlinearities via digital back-propagation enables up to 10 dB improvement in maximum transmittable power and ~8 dB Qeff improvement which translates to a nine-fold enhancement in transmission reach for PM-256QAM, where the largest improvements are associated with higher-order modulation formats. We further demonstrate that even under strong nonlinear distortion the transmission reach only reduces by a factor of ~2.5 for a 2 unit increase in capacity (log2m) when full band DBP is employed, in proportion to the required back-to-back OSNR.

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