Vijayan Kovendhan, He Zonglong, Foo Benjamin, Schröder Jochen, Karlsson Magnus, Andrekson Peter A
Opt Express. 2021 Oct 11;29(21):33086-33096. doi: 10.1364/OE.426504.
The throughput and reach in fiber-optic communication links are limited by in-line optical amplifier noise and the Kerr nonlinearity in the optical transmission fiber. Phase-sensitive amplifiers (PSAs) are capable of amplifying signals without adding excess noise and mitigating the impairments caused by the Kerr nonlinearity. However, the effectiveness of Kerr nonlinearity mitigation depends on the dispersion pre-compensation in each span. This paper investigates dense wavelength-division multiplexed PSA-amplified links using joint processing with a less complex digital domain Volterra nonlinear equalizer at the receiver. Both numerically and with experiments, it is shown that this significantly reduces the impact of the dispersion pre-compensation in each span. Also, with simulations, a substantial improvement in transmission reach is demonstrated for PSA links.
光纤通信链路中的吞吐量和传输距离受到在线光放大器噪声以及光传输光纤中的克尔非线性的限制。相敏放大器（PSA）能够在不增加额外噪声的情况下放大信号，并减轻克尔非线性所造成的损伤。然而，减轻克尔非线性的有效性取决于每个跨度中的色散预补偿。本文研究了在接收机处使用不太复杂的数字域沃尔泰拉非线性均衡器进行联合处理的密集波分复用PSA放大链路。通过数值模拟和实验均表明，这显著降低了每个跨度中色散预补偿的影响。此外，通过仿真还证明了PSA链路的传输距离有大幅改善。
