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We present several nonlinear compensation algorithms and demonstrate their performance on both 44.1Gbit/s single channel and 1.76Tbit/s superchannel Nyquist-SCFDE PDM-16QAM transmission systems. Up to 1.6dB Q improvement for single channel and 0.66 dB for superchannel can be achieved by nonlinear compensation.
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... Figure 3(b) and Fig. 3(c) qualitatively show the constellations at optimum power for both LC and INLC, for 1-carrier 240Gb/s transmission scenario. Note that recently, a 1Tb/s super-channel wide-band digital nonlinear compensation was reported in [22,23], showing reduced improvement, compared to conventional single-carrier transmission systems [13], consistent with our results. ...
We report on the nonlinear transmission limits of various super-channel configurations in a flex-grid network upgrade scenario. In particular, we consider flexible data-rates ranging from 180Gb/s to 1.2Tb/s, employing either single-carrier, dual-carrier, or penta-carrier polarization multiplexed m-state quadrature amplitude modulation (PM-8QAM/PM-16QAM) –termed as super-channels, and establish transmission performance margins for each configuration, both with and without super-channel fiber nonlinearity compensation. Our results show that the benefit of intra super-channel nonlinearity mitigation (nonlinear compensation addressing full super-channel bandwidth) reduces with increasing sub-carrier count within the super-channel, and that single-carrier super-channel achieves the maximum improvement from nonlinearity mitigation (up to ~4.5dB, in Q-factor), better than dual-carrier (up to ~3.5dB) and penta-carrier (up to ~2dB) configurations. Moreover, the maximum reach improvement, compared to linear compensation only, is found to be ~170% (180Gb/s, PM-8QAM), ~150% (240Gb/s, PM-16QAM), ~100% (360Gb/s, PM-8QAM), ~100% (480Gb/s, PM-16QAM), and ~65% (1.2Tb/s, PM-16QAM).
Superchannel transmission spaced at the symbol rate, known as Nyquist spacing, has been demonstrated for effectively maximizing the optical communication channel capacity and spectral efficiency. However, the achievable capacity and reach of transmission systems using advanced modulation formats are affected by fibre nonlinearities and equalization enhanced phase noise (EEPN). Fibre nonlinearities can be effectively compensated using digital back-propagation (DBP). However EEPN which arises from the interaction between laser phase noise and dispersion cannot be efficiently mitigated, and can significantly degrade the performance of transmission systems. Here we report the first investigation of the origin and the impact of EEPN in Nyquist-spaced superchannel system, employing electronic dispersion compensation (EDC) and multi-channel DBP (MC-DBP). Analysis was carried out in a Nyquist-spaced 9-channel 32-Gbaud DP-64QAM transmission system. Results confirm that EEPN significantly degrades the performance of all sub-channels of the superchannel system and that the distortions are more severe for the outer sub-channels, both using EDC and MC-DBP. It is also found that the origin of EEPN depends on the relative position between the carrier phase recovery module and the EDC (or MC-DBP) module. Considering EEPN, diverse coding techniques and modulation formats have to be applied for optimizing different sub-channels in superchannel systems.
The Nyquist wavelength division multiplexing (Nyquist-WDM) technology has aroused great interests for its high spectrum efficiency (SE) by narrowing down the bandwidth in each channel without introducing inter-symbol-interference (ISI). In this paper, we discuss the principle and experiments of coherent optical Nyquist single carrier frequency domain equalization (SCFDE) systems. Terabit Nyquist super-channel transmission and nonlinear compensation are reviewed.
