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Abstract
We propose a simple method to mitigate the cross phase modulation (XPM) effect in wavelength division multiplexing (WDM) systems, which combines the split nonlinearity compensation (NLC) and the receiver-side phase recovery algorithm. In the proposed method, the split NLC can suppress the conversion from the nonlinear phase noise (NLPN) to the Gaussian-like nonlinear interference noise (NLIN), and together with the phase recovery algorithm, which can compensate for the NLPN, the impact of the XPM on the signal is finally mitigated. This method is demonstrated by a transmission simulation with 11 WDM channels and 32 Gbaud 16 QAM modulations. The simulation results show that, due to the XPM mitigation, the proposed method can provide 0.4 dB gain for 500-km transmission, 0.3 dB gain for 2000-km transmission, and about 0.2 dB gain for 3000-km to 10000-km transmissions. The influence of the transmission distance on the gain is also discussed. Moreover, the selection of the phase recovery algorithm for different transmission distances is investigated, and the results show that for a short distance the blind phase search (BPS) is better, but for a long distance the V&V algorithm is more appropriate.
Highlights
Fiber nonlinearity is a critical issue that limits the capacity of the optical communication systems, especially the wavelength division multiplexing (WDM) systems [1], [2]
The split nonlinearity compensation (NLC) can suppress the conversion from the nonlinear phase noise (NLPN) to the Gaussian-like nonlinear interference noise (NLIN), and together with the phase recovery algorithm, which can compensate for the NLPN, the impact of the XPM on the signal is mitigated
We can exclude that the gain brought by the split NLC in the multi-channel case is due to the nonlinear signal-noise interaction mitigation
Summary
Fiber nonlinearity is a critical issue that limits the capacity of the optical communication systems, especially the wavelength division multiplexing (WDM) systems [1], [2]. Optical phase conjugation is an effective method that can simultaneously compensate for the intra- and inter-channel fiber nonlinearity [8], [9] Another optical method is the optical parameter amplifier, which can mitigate the nonlinear phase noise in WDM systems by the phase-sensitive characteristic [10]. Multi-channel DBP is surely an effective method, but the requirement of the information of other receiving channels and the exponential computational complexity make it hard to implement in practical systems [11], [12] Another approach is the subcarrier multiplexing, which can mitigate the XPM effects in WDM systems by subcarrier optimization [13], [14], but the implementation of this method depends on the modulation formats and it is not suitable for the incoming dynamic optical network [1], 7]. The relationship between the gain and the transmission distance and the selection of the phase recovery method are discussed
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