Bidaki Elham, Kumar Shiva
Opt Lett. 2020 Sep 1;45(17):4682-4685. doi: 10.1364/OL.400815.
We investigate the combination of a nonlinear frequency division multiplexed (NFDM) transmission scheme with midpoint optical phase conjugation (OPC), and show that midpoint OPC introduces power enhancement by compensating for nonlinear impairments. It offers a degree of freedom to have a flexible power normalization factor, . Optimizing helps minimize the signal-noise mixing in nonlinear Fourier transform processing for a specific launch power, resulting in improving the system performance significantly. The mid-OPC NFDM system can provide 4.5 dB and 5.6 dB advantages in -factor as compared to the conventional NFDM system when the transmission fiber is standard single-mode fiber and a fiber with optimum dispersion, respectively. Mid-OPC NFDM can also offer higher spectral efficiency at a longer transmission reach due to the shorter guard interval.
我们研究了非线性频分复用（NFDM）传输方案与中点光相位共轭（OPC）的结合，并表明中点OPC通过补偿非线性损伤来实现功率增强。它提供了一个自由度，以具有灵活的功率归一化因子。对于特定的发射功率，优化有助于最小化非线性傅里叶变换处理中的信号噪声混合，从而显著提高系统性能。当传输光纤分别为标准单模光纤和具有最佳色散的光纤时，中点OPC NFDM系统在因子方面比传统NFDM系统分别具有4.5 dB和5.6 dB的优势。由于保护间隔较短，中点OPC NFDM在更长的传输距离上也可以提供更高的频谱效率。
