Digital back-propagation for spectrally efficient WDM 112 Gbit/s PM m-ary QAM transmission
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 imp...
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Published in | Optics express Vol. 19; no. 6; p. 5219 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
United States
14.03.2011
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Online Access | Get full text |
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Summary: | 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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ISSN: | 1094-4087 1094-4087 |
DOI: | 10.1364/OE.19.005219 |