星上光电振荡器的微波信号产生与转发研究

为了降低星上通信系统的质量和体积、增强系统的温度稳定性和抗电磁干扰能力，采用了一个新方法，将光电振荡器用作星上微波本振源，产生微波信号，利用光纤转发，将微波信号的产生、分配、传输与变频处理融为一个系统，并进行了理论分析和实验验证。结果表明，基于光电振荡器产生了11.5GHz的微波本振信号，通过光纤进行多路转发，其中第1路信号频率与本振源相同，相位噪声为-100.5dBc/Hz@10kHz，第2路信号频率为本振信号的2倍，相位噪声为-86.6dBc/Hz@10kHz。与传统电学方法相比，该方法有显著成效，可提高转发效率，减小系统体积和重量，增强系统抗干扰性和温度稳定性，提高系统的带宽和微波信号质量、降低卫星通信成本。

Study on generation and distribution of microwave signals based on optoelectronic oscillator for satellite applications

In order to reduce the volume and weight of a satellite communication system and enhance its temperature stability and anti electromagnetic interference ability, a new method was adopted.A photoelectric oscillator was used as microwave local oscillator on the satellite.Microwave signal was transmitted by the fiber.The generation, distribution, transmission and frequency conversion of microwave signal were integrated into the system.After theoretical analysis and experimental verification, the results show that the method is feasible.Based on an optoelectric oscillator, the microwave signal of 11.5GHz was generated and distributed by low-loss optical fiber through multi-channel output experimentally.The first output signal has the same frequency with the local oscillator, with phase noise of-100.5dBc/Hz@10kHz.The second output signal's frequency is twice of local oscillator's frequency with phase noise of-86.6dBc/Hz@10kHz.Compared with the conventional electrical method, the new method to transmit microwave signal has significant effect in improving transmit efficiency, reducing volume, weight and cost, enhancing anti-jamming power and temperature stability, improving signal quality and bandwidth of the system.