基于三平行MZM的无滤波16倍频毫米波生成方案

A filterless scheme of generating frequency 16-tupling mm Wave based on triple-parallel MZM

为了提高生成毫米波倍频数的同时降低系统复杂度,提出了一种基于三平行马赫-曾德尔调制器的无滤波16倍频毫米波生成方案。该方案利用两个并联的马赫-曾德尔调制器产生载波和8阶光边带,通过调节第三个马赫-曾德尔调制器的直流偏置电压抑制载波,经光电探测器拍频得到16倍频毫米波信号。对16倍频毫米波产生的原理进行了详细分析,并通过仿真对方案的可行性进行了验证,其光边带抑制比和射频杂散抑制比分别为29.7 dB和24.6 dB。根据仿真结果分析了调制深度的偏移、消光比、MZM-3的直流电压偏移及MZM-1与MZM-2射频信号相位差对系统的影响,结果显示在一定的偏差范围内系统仍可获得良好的性能。

In order to improve the number of mmWave multiples generated and reduce the system complexity,a filterless 16-tupling millimeter-wave generation scheme based on triple-parallel Mach Zehnder modulator(MZM)is proposed.This scheme uses two MZMs in parallel to generate the carrier and the 8th order optical sidebands,suppresses the carrier by adjusting the DC bias voltage of the third MZM,and obtains a 16-tupling millimeter-wave signal by the photodetector(PD)beating frequency.The principle of 16-tupling millimeter-wave generation is analyzed in detail,and the feasibility of the scheme is verified by simulation.The optical sideband suppression ratio(OSSR)is achieved 29.7 dB.All at once,the value of radio frequency stray suppression ratio(RFSSR)is 24.6 dB.According to the simulation results,the influence of the shift of modulation index,modulator extinction ratio,DC voltage offset of MZM-3 and phase difference of MZM-1 and MZM-2 ratio frequency signals on the system is analyzed,and the results show that the system can still obtain good performance within a certain deviation range.