40Gb/s光DQPSK传输系统性能分析

介绍了光差分正交相移键控(DQPSK)的调制和解调方式,对非归零码(NRZ),归零码(RZ)和载波抑制归零码(CSRZ)进行调制,研究40Gb/s高速传输系统中不同类型的光信号.使用色散补偿方式进行200km的模拟仿真,比较不同码型的传输特性.分析表明CS-RZ-DQPSK调制格式,具有更强的抗色散和偏振模色散能力,在较宽的入纤功率范围内取得最小的眼图张开代价.

Performance analysis on 40Gbit/s optical DQPSK transmission system

The modulation and demodulation methods of the optical Differential Quadrature Phase Shift Key (DQPSK) and the different modulation formats including nonretum-to-zero(NRZ), return-to-zero (RZ), carri-er-suppressed retum-to-zero (CS-RZ) are introduced, studying the different optical signals in the 40Gb/s high speed transmission system. The system is simulated in 200km optical fiber by way of dispersion compensa-tion. It is showed that the ability of anti-dispersion and anti-PMD is better in the CS-RZ-DQPSK modulation format, and this format has the smallest eye-opening penalty (EOP) with a wider range of power into the opti-cal fiber.