基于DDMZM的星载微波光子混频器设计

Design of satellite-borne microwave photonic mixer based on DDMZM

微波部件由于分布式参数的影响,存在一定的频率选择性,难以实现宽带多频段兼容的变频系统,已不能满足高通量星载通信载荷的需求。微波光子技术以其大带宽和无频率选择性的优势为高通量天基通信需求的实现提供了可能性。基于双驱动马赫增德尔调制器(DDMZM)对星载通信转发设备混频单元的方案进行探索,通过理论分析链路模型,使用VPI软件对链路进行仿真优化来寻找DDMZM的最佳偏置点。试验结果表明调制器偏置在最小点时,变频效率高,且具有一定的载波抑制功能,可实现宽带、多频段以及抗干扰等性能,优于微波变频性能。

Due to the influence of distributed parameters on microwave components, there is certain frequency selectivity, and it is difficult to achieve the broadband and multi-band compatible frequency conversion system, which can no longer meet the needs of the high-throughput satellite communication payload. Microwave photonics technology provides the possibility of realizing high-throughput satellite communication needs with its advantages of large bandwidth and no frequency selectivity. Based on dual-drive Mach-Zehnder modulator(DDMZM), the solution of the frequency conversion unit of the satellite communication system was explored. Through theoretical analysis of the link model, the software VPI was used to simulate and optimize the link to find the best offset point of the DDMZM. The experimental results show that when the modulator is biased at the minimum point, the frequency conversion efficiency is high, and it has certain carrier suppression function, which can achieve broadband, multi-band and anti-interference performance,and is superior to microwave frequency conversion performance.