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针对卫星通信中微波信号光学处理问题,建立了星间微波光子下变频系统模型,采用两个双电极马赫-曾德尔调制器(DE-MZM)并联形式,以光载波抑制(DCS)方式实现了星间微波信号的光域放大、传输和下变频。利用贝塞尔函数展开分析了下变频系统中信号和各噪声分量,对射频本振信号功率进行了优化,仿真研究了调制器直流偏置漂移、移相器相移误差和发射光功率对系统性能的影响。结果表明,调制器直流偏置相位漂移小于5℃时输出载噪比(CNR)恶化小于0.05 dB,移相器相移误差小于5℃时输出CNR恶化小于0.02 dB,系统具有较高稳定性;当发射功率为10.48 dB时,输出CNR达31.33 dB,系统能够满足输出CNR要求。
In order to deal with the problem of microwave signal optical processing in satellite communication, an inter-satellite microwave photon down-conversion system model is established. By using two bipolar Mach-Zehnder modulators (DE-MZM) in parallel and optical carrier suppression (DCS) Interplanetary microwave signal amplification, transmission and down-conversion. The Bessel function was used to analyze the signals and noise components in the downconversion system. The power of the RF local oscillator signal was optimized. The influences of the DC offset drift of the modulator, the phase shift error of the phase shifter and the transmitted light power on the system The impact of performance. The results show that the output CNR degradation is less than 0.05 dB when the DC offset phase shift of the modulator is less than 5 ℃, and the output CNR degradation is less than 0.02 dB when the phase shift error of the phase shifter is less than 5 ℃. The system has high stability. When the transmitting power is 10.48 dB, the output CNR reaches 31.33 dB, and the system can meet the output CNR requirements.