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在级联相位调制的100 Gbit/s光信号传输系统中,对差分相移键控非归零码(NRZ-DPSK)、差分相移键控归零码(RZ-DPSK)、差分四相相移键控非归零码(NRZ-DQPSK)和差分四相相移键控归零码(RZ-DQPSK)进行了比较研究。当四种信号通过90 km的标准单模光纤(SMF)和16 km的色散补偿光纤(DCF)传输后,在满足相同入纤功率的条件下,NRZ-DQPSK信号具有最高的色散容限;如果仅仅考虑一阶偏振模色散(PMD),RZ-DQPSK信号具有最优的抗偏振模色散特性;当入纤功率在0～10 dBm的范围内调节时,RZ-DPSK信号具有最好的非线性容忍度;最后比较了四种相位调制码型传输后通过不同带宽的三阶高斯滤波器后的接收性能,得出滤波器带宽值大于125 GHz后,NRZ-DPSK信号的接收性能最佳。
In the cascaded phase modulated 100 Gbit / s optical signal transmission system, differential phase shift keying non-return to zero (NRZ-DPSK), differential phase shift keying to zero (RZ-DPSK), differential four-phase Shift-controlled non-return to zero (NRZ-DQPSK) and differential four-phase shift keying to zero (RZ-DQPSK) were compared. The NRZ-DQPSK signal has the highest dispersion tolerance when the four signals pass through 90 km of standard single-mode fiber (SMF) and 16 km of dispersion-compensating fiber (DCF). If Considering only the first order PMD, the RZ-DQPSK signal has the best anti-polarization mode dispersion property. The RZ-DPSK signal has the best nonlinearity when the input power is adjusted from 0 to 10 dBm Finally, we compared the reception performance of the third-order Gaussian filter with different bandwidths after the transmission of the four phase modulation patterns. The results show that the best reception performance of the NRZ-DPSK signal is obtained when the filter bandwidth is greater than 125 GHz.