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分别推导了相位调制系统中采用色散预补偿方式和后补偿方式下非线性相位噪声的计算公式,基于此对这两种色散补偿方式下的相位噪声、功率容限以及最优信号峰值功率进行了详细的分析和讨论,结果表明:采用色散预补偿方式较后补偿方式能更有效地抑制非线性相位噪声,其对非线性相位噪声的抑制能力随着信号能量、放大自发辐射(ASE)的功率谱密度以及传输距离的增加而提高;同时,色散预补偿系统具有更高的功率容限;色散的作用使系统的最优信号峰值功率增大,最佳相移大于1rad;色散预补偿系统的最优信号峰值功率大于色散后补偿系统。
The formulas of dispersion pre-compensation and post-compensation are respectively deduced in the phase modulation system. Based on this, the phase noise, power margin and peak signal power of these two kinds of dispersion compensation are calculated respectively The detailed analysis and discussion show that using the pre-compensation method of dispersion can suppress non-linear phase noise more effectively than the post-compensation method, and its ability to suppress nonlinear phase noise increases with the signal energy and the power of spontaneous emission (ASE) Spectral density and transmission distance increase; At the same time, the dispersion pre-compensation system has a higher power margin; the dispersion of the optimal signal peak power of the system increases, the optimal phase shift greater than 1rad; Dispersion pre-compensation system The optimal signal peak power is greater than the dispersion compensation system.