论文部分内容阅读
研究了基于双电极马赫曾德尔干涉仪(DE-MZM)的星上微波信号光学调制方法,获得了单频段微波信号输入时的调制器输出光场表达式,推导了载噪比、射频增益、噪声系数及无杂散动态范围四个参数的解析表达式,建立了星上微波光子链路传输方程。利用Opti System仿真软件,搭建了单频段微波信号输入时的星上微波光子链路仿真系统,对链路性能进行了仿真研究。研究结果表明,调制器直流偏置点在正交点时,射频信号增益最高;直流偏置点在低偏置点时,载噪比、噪声系数和无杂散动态范围三个性能指标最优。
The optical modulation method of on-board microwave signal based on two-electrode Mach-Zehnder interferometer (DE-MZM) was studied. The expression of the output light field of the modulator when the single-frequency microwave signal was input was obtained. The signal- Noise coefficient and spurious-free dynamic range of the four parameters of the analytical expression, the establishment of the satellite microwave photonic chain transmission equation. OptiStar simulation software is used to build the on-board microwave photon link simulation system when the single-band microwave signal is input, and the link performance is simulated. The results show that the gain of the RF signal is the highest when the DC bias point of the modulator is at the quadrature point. When the DC bias point is at the low bias point, the three performance indexes of carrier-to-noise ratio, noise figure and spurious-free dynamic range are optimal .