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在级联相位调制的100 Gbit/s光信号传输系统中,提出了占空比为33%的光交错相移键控归零码(RZ-SDPSK)和占空比为67%的光交错相移键控载波抑制归零码(CSRZ-SDPSK)的产生和检测方案。通过50 km的普通单模光纤(SMF)和8 km的色散补偿光纤(DCF)传输后,当入纤功率相同时,CSRZ-SDPSK码具有较高的色散容限;如果仅考虑一阶偏振模色散(PMD),RZ-SDPSK信号具有较好的抗PMD特性。入纤功率在0～10dBm范围内调节时,两种码型码有相似的传输特性。通过125 GHz带宽的三阶高斯滤波器后,RZ-SDPSK码接收性能较优,并且三阶高斯带通滤波器(DBPF)的带宽值必须大于100 GHz,才能有效地恢复信号时钟。
In a cascaded phase modulated 100 Gbit / s optical signal transmission system, an optical interleaving phase shift keying zeroing code (RZ-SDPSK) with a duty ratio of 33% and an optical interleaving phase with a duty ratio of 67% are proposed Shift keying carrier zeroing suppression (CSRZ-SDPSK) generation and detection scheme. CSRZ-SDPSK codes have higher dispersion tolerance when transmitted at the same fiber power with 50 km ordinary single-mode fiber (SMF) and 8 km dispersion-compensated fiber (DCF) transmission. If only the first-order polarization mode Dispersion (PMD), RZ-SDPSK signal has good anti-PMD characteristics. Into the fiber power in the range of 0 ~ 10dBm regulation, the two code type code have similar transmission characteristics. After passing through a third-order Gaussian filter of 125 GHz bandwidth, the RZ-SDPSK code has better reception performance and the bandwidth of the third-order Gaussian bandpass filter (DBPF) must be greater than 100 GHz to effectively recover the signal clock.