Abstract
We investigate a digital back-propagation simplification method to enable computationally-efficient digital nonlinearity compensation for a coherently-detected 112 Gb/s polarization multiplexed quadrature phase shifted keying transmission over a 1,600 km link (20 x 80 km) with no inline compensation. Through numerical simulation, we report up to 80% reduction in required back-propagation steps to perform nonlinear compensation, in comparison to the standard back-propagation algorithm. This method takes into account the correlation between adjacent symbols at a given instant using a weighted-average approach, and optimization of the position of nonlinear compensator stage to enable practical digital back-propagation.
Highlights
The growing bandwidth demand from bandwidth-intense digital multimedia applications [1] continues to press the capacity requirement on the optical transmission systems
We test the algorithm on a 112 Gb/s polarization multiplexed quadrature phase shifted keying (PM-QPSK) system, in a 1,600 km (20x80km) transmission system, and show that a considerable complexity reduction can be achieved compared to standard digital back-propagation (DBP) methods [11,14]
The two polarization components were combined by means of an ideal polarization beam combiner and the resulting 112 Gb/s PM-QPSK was passed through a 35 GHz 3rd order Gaussian filter and sent over the transmission link consisting of twenty spans comprising an erbium doped fibre amplifier (EDFA) followed by 80 km of standard single mode fibre (SSMF)
Summary
The growing bandwidth demand from bandwidth-intense digital multimedia applications [1] continues to press the capacity requirement on the optical transmission systems. Polarization multiplexed quadrature phase shifted keying (PM-QPSK) has been widely acknowledged as an optimum modulation format and has been investigated under various transmission scenarios [3,4]. Such an increase in transmission capacity emerges at the expense of increased susceptibility to linear and nonlinear fibre impairments, alongside more complex design architecture. In this paper we investigate through numerical simulations, a simplified DBP algorithm based on the correlation of signal power in neighboring symbols when applying nonlinear phase compensation, and optimization of the position of nonlinear compensator, which requires less than one processing step per transmission span. We test the algorithm on a 112 Gb/s PM-QPSK system, in a 1,600 km (20x80km) transmission system, and show that a considerable complexity reduction can be achieved compared to standard DBP methods [11,14]
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