偏振模色散对非线性光纤环镜微波光子开关的影响及其补偿

Impact and Compensation of PMD in the Microwave Photonic Switching Based on NOLM

建立了考虑PMD在内的NOLM微波光子开关光波传输方程,给出了基于耦合非线性薛定谔方程的分步傅里叶法,三维庞加莱球理论和琼斯传输矩阵法的数值分析模型·仿真获得在光子开关中微波直接强度调制光载波的传输过程,以及在不同调制带宽下一阶和二阶PMD对光波信号和NOLM功率传输函数的影响·指出PMD造成NOLM开关性能钝化和消光比严重恶化,并引起信号信噪比下降和旁瓣泄漏·当调制带宽大于40GHz时,二阶PMD的影响比一阶PMD更加严重·最后讨论了NOLM中的PMD补偿问题·

It is established that the propagation equation of the optical field including PMD and the numerical simulation model in the microwave photonic switching based on NOLM by the split-step Fourier method （SSFM） that can solve the coupled nonlinear Schr6dinger equation （CNLSE）, the threedimensional Poincare sphere theory and the Jones matrix method. It is obtained by simulation that the propagation process of optical carrier directly intensity modulated by the microwave in NOLM and the impact of the first-order and second-order PMD on the optical wave and the power transmission function of NOLM. The switching performance and the extinction ratio of the NOLM with large modulation bandwidth are deteriorated badly by PMD. And it induces the descent of the SNR and the side lobe leak of the signal. The impact of the second-order PMD is far more than that of the first-order PMD when the modulation bandwidth is larger than 40GHz. Furthermore, the compensation of PMD in the NOLM is discussed.