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利用信号光和插入的连续泵浦光之间产生的交叉相位调制(XPM)效应,提出了一种基于并联的XPM效应来监测光相位调制信号的一阶偏振模色散(PMD)的新技术。泵浦光的光谱会随着信号光中PMD和色散(CD)的变化而发生变化,所以导致泵浦光的光功率发生变化,在并联的一个支路中抑制PMD的影响,利用并联的两路同一波段泵浦光功率的差值来进行监测。仿真结果显示,新的技术可以实现对40 Gb/s非归零差分四相移相键控(NRZ-DQPSK)光信号从0~20 ps的监测。在20 ps的监测范围内,新技术的动态范围大于3 d B,可以用来进行准确的监测。对信号速率、色散、泵浦光功率和滤波器带宽对新技术的影响做了详细的研究。
By using the cross-phase modulation (XPM) effect between the signal light and the inserted continuous pump light, a new technique of monitoring the first order PMD of the optical phase modulated signal based on the XPM effect in parallel is proposed. The spectrum of the pump light changes as the PMD and dispersion (CD) of the signal light changes, resulting in a change in the optical power of the pump light, suppressing the effect of PMD in one branch in parallel, using two Road, the same band of pump optical power to monitor the difference. The simulation results show that the new technique can realize the monitoring of 0 ~ 20 ps of 40 Gb / s non-return-to-zero differential quadrature phase shift keying (NRZ-DQPSK) optical signals. The dynamic range of the new technology is greater than 3 d B in the 20 ps range and can be used for accurate monitoring. The effects of signal rate, dispersion, pump power and filter bandwidth on new technologies are studied in detail.