论文部分内容阅读
介绍了一种应用于100Gbit/s传输系统的新型光信号调制码型——交错差分相位调制码(SDPSK)。该码型的解调仅通过一个1bit延时的马赫曾德尔延时干涉仪和一个平衡接收机即可实现。与传统的4种级联相位调制码型进行长距离传输特性比较后证明:基于NRZ码和50%占空比RZ码的SDPSK码与相同包络的DPSK码具有几乎相同的色散容限和一阶偏振模色散容限;与有相同包络的DPSK信号和差分四相相移键控码(DQPSK)信号相比,基于NRZ码和RZ码的SDPSK信号具有更高的抵抗非线性负面效应的能力;经过90km普通单模光纤传输并采用16km色散补偿光纤进行后置色散补偿后,通过带宽值大于125GHz的三阶高斯滤波器检测光信号,RZ-SDPSK信号的接收性能最佳。
A new type of optical signal modulation code, staggered differential phase modulation code (SDPSK), is introduced for 100Gbit / s transmission system. The demodulation of this pattern can be realized only by a 1bit delay Mach-Zehnder delay interferometer and a balanced receiver. Compared with the traditional four kinds of cascaded phase modulation patterns for long-distance transmission characteristics, it is proved that the SDPSK codes based on the NRZ code and the 50% duty cycle RZ code have almost the same dispersion tolerance and the same DPSK code Compared with DPSK signals and DQPSK signals with the same envelope, the SDPSK signals based on NRZ code and RZ code have higher resistance to nonlinear negative effects The RZ-SDPSK signal has the best reception performance after passing 90km ordinary single-mode optical fiber and using 16km dispersion compensation fiber for post-dispersion compensation. The optical signal is detected by a third-order Gaussian filter with a bandwidth greater than 125GHz.