基于不同调制格式和比特率的 32 信道系统对非线性损伤的恢复能力分析

D. Kassegne, Barerem-Melgueba Mao, S. Ouro-Djobo
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摘要

设计用于光纤传输的 DWDM 系统需要优化一些重要参数,使系统更能承受非线性损伤。本文针对不同的调制格式(RZ、NRZ、4-QAM 和 DQPSK),然后是高斯(Gauss)和双曲正割(Sech)脉冲,对每个信道具有不同比特率的 32 信道系统进行了模拟。主要目的是在考虑到所使用的不同调制格式和比特率的情况下,研究所设计系统对非线性效应的适应能力。因此,在使用 optisystem 软件进行的不同模拟中进行了多次比较。结果显示,当每个信道的比特率为 40 Gbps 时,性能顺序依次为 NRZ、Sech、4-QAM、RZ 和 DQPSK;而当每个信道的比特率为 100 Gbps 时,性能顺序依次为 NRZ、DQPSK、4-QAM、Sech 和 RZ。对于没有非线性效应的 100 Gbps 比特率,在所考虑的输入功率(-10 dBm 至 10 dBm)条件下,4-QAM 格式比其他调制格式更有效。而当输入功率超过 5 dBm 时,同样的 4-QAM 格式更容易受到非线性效应的影响。在比特率为 100 Gbps 的模拟系统中,当输入功率介于 -10 dBm 和 8 dBm 之间时,DQPSK 格式对非线性效应的适应能力更强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of the resilience of 32-channels system to nonlinear impairments based on different modulation formats and bit rates
Designing a DWDM system for fiber optic transmissions requires optimizing some important parameters to enable the system to be more tolerant to nonlinear impairments. This paper proposes a simulation of a 32-channels system with different bit rates per channel, for different modulation formats (RZ, NRZ, 4-QAM, and DQPSK) then the Gaussian (Gauss) and Hyperbolic Secant (Sech) pulses. The main goal is to investigate the resilience of the designed system to nonlinear effects, taking into account the different modulation formats and bit rates used. Thus, several comparisons were taken into account in the different simulations carried out with the optisystem software. The results reveal that for a bit rate of 40 Gbps per channel, the order of performance is NRZ, Sech, 4-QAM, RZ, and DQPSK; whereas for a bit rate of 100 Gbps per channel, the order becomes NRZ, DQPSK, 4-QAM, Sech, and RZ. For a bit rate of 100 Gbps without nonlinear effects, the 4-QAM format would be more efficient than other modulation formats for the input powers considered (−10 dBm to 10 dBm). While this same 4-QAM format is more vulnerable to nonlinear effects beyond an input power of 5 dBm. At a bit rate of 100 Gbps, the DQPSK format would be more resilient to nonlinear effects for input powers between −10 dBm and 8 dBm for the simulated system.
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