基于级联MZM倍频系数可调高频微波信号光产生方法

Approach to Generate High-frequency Microwave Signal with Frequency Multiplication Factor Tunability by Using Cascaded Mach-Zehnder Modulators

理论分析了在不改变光滤波器的条件下,通过设置级联马赫曾德尔调制器的直流偏置点和调制指数,实现最小光边带抑制比和最小杂散抑制比分别为45.48dB和39.46dB,倍频系数为2k(k=1,2,…,6)的高频微波信号产生.在此基础上,分析了马赫曾德尔调制器直流偏置点、射频调制信号幅度和初始相位差等因素变化对边带选取性能的影响,并进行了相应的仿真实验,实验结果验证了该方法的可行性和有效性.

From a theoretical analysis, the frequency multiplication factor of 2k microwave signal with a minimum optical sideband suppression ratio of 45.48 dB and a minimum spurious suppression radio of 39.46 dB is generated by properly adjusting the direct current bias points and the modulation index of the cascaded Mach-Zehnder modulators without changing the optical filter. Moreover, the performance of sideband selection with the direct current bias point of Mach-Zehnder modulator, the amplitude and the initial phase difference of the modulation signal deviate from the ideal values is analyzed. Furthermore, the performance is evaluated by simulation experiment. The simulation results validate the feasibility and effectiveness of the proposed approach.