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通过求解耦合非线性薛定谔方程,数值分析了8×40Gbit/s波分复用(WDM)系统中色散、偏振模色散(PMD)、非线性效应和信道间距对载波抑制归零-差分正交相移键控(CSRZDQPSK)调制格式的影响。结果表明不同信道间传输特性相似,而在高速、窄信道间距的WDM系统中偏振模色散(PMD)和非线性效应的影响会进一步加剧。当入纤功率从8dBm增大到11dBm时,CSRZ-DQPSK调制格式Q值从7.8dB线性降低到2.8dB,而当信道间距低于100GHz后系统性能急速变差。
By solving the coupled nonlinear Schrödinger equation, the dispersion, PMD, nonlinear effects and channel spacing in 8 × 40Gbit / s WDM systems are numerically analyzed for the carrier suppressed zero-differential quadrature phase Shift Keying (CSRZDQPSK) modulation format. The results show that the transmission characteristics are similar between different channels, and the impact of PMD and nonlinear effects is further aggravated in WDM systems with high speed and narrow channel spacing. When the fiber power is increased from 8dBm to 11dBm, the Q value of CSRZ-DQPSK modulation format decreases linearly from 7.8dB to 2.8dB, and the system performance deteriorates rapidly when the channel spacing is less than 100GHz.