Implications of Distributed Link Polarization-Dependent Loss on Bitwise Achievable Information Rates for Probabilistically Shaped and Uniform DP 64-QAM
Journal of Lightwave Technology(2019)
摘要
The statistical behaviors of bitwise achievable information rates (BW AIRs) and effective signal-to-noise ratios (SNRs) due to polarization-dependent loss (PDL) are experimentally characterized for probabilistically shaped and uniform dual-polarization 64-ary quadrature amplitude modulation with a bit rate of 250 Gb/s. A single-span recirculating loop is used to emulate distributed link PDL. Histograms for the BW AIR and effective SNR following offline signal processing resemble shifted, mirror-image Maxwell probability density functions for both constellations and two different per-loop PDL values. For a transmission distance of 1200 km and a per-loop PDL of 1.3 dB, the outage probabilities for the shaped and uniform constellations are estimated to be
$1.1\times 10^{-3}$
and
$4.4\times 10^{-1}$
, respectively. Moreover, for an outage probability
$\leq$
$4.0\times 10^{-3}$
, the increase in transmission distance due to shaping is reduced by 50% compared to that for PDL free transmission.
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关键词
Signal to noise ratio,Optical attenuators,Quadrature amplitude modulation,Information rates,Bit rate,Probability density function,Optical polarization
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