空间卫星相干激光通信系统高速宽带调频低噪声本振激光技术研究

High-speed space satellite coherent laser communication plays a vital role in space-ground real time high-speed laser communication network and gapless link of global data. For meeting the urgent demand of the low-noise fast-tuning broad-band local oscillator laser in the high-speed space satellite coherent laser communication with zero differential coherent detection system, the project proposes to combine the electro-optic modulator (EOM) higher-order modulation sideband frequency modulation technology with the semiconductor laser injection-locking technology, and then realize the broad-band fast-tuning of low-noise laser by using of the spread spectrum characteristics of the higher-order modulation sideband and the noise suppression characteristics of the injection-locking. Many key techniques will be studied such as the multi-order flat low noise frequency comb generation by EOM, injection-locking noise control, semiconductor laser dynamic injection-locking with large frequency range, and the bottleneck of simultaneous acquisition the narrow linewidth and fast-tuning characteristics in the local oscillator laser is expected to be broken. The project will hopefully provide fundamental theoretical and technical support for the rapid development of the high-speed space satellite coherent laser communication.

高速空间卫星相干激光通信在构建天地一体化实时高速激光通信网络、实现全球数据高速无缝链接中具有至关重要的作用。本项目针对目前高速空间卫星相干激光通信零差相干探测体制下对快速宽带调频本振激光器的迫切应用需求，拟将电光调制器（EOM）高阶调制边带调频技术与半导体激光器注入锁定技术相结合，利用高阶调制边带对调制频率的扩频特性及注入锁定的噪声抑制特性实现低噪声激光的高速宽带调频。项目拟开展射频驱动电光调制器多阶平坦低噪声频率梳产生、激光注入锁定噪声控制、半导体激光大范围动态注入锁定等若干关键技术的研究，以期突破现有本振激光光源面临的线宽与调频特性难以同时满足的瓶颈问题，为高速空间卫星相干激光通信系统快速发展提供理论基础与技术支撑。

高速空间卫星相干激光通信在构建天地一体化实时高速激光通信网络、实现全球数据高速无缝链接中具有至关重要的作用。本项目针对目前高速空间卫星相干激光通信零差相干探测体制下对快速宽带调频本振激光器的迫切应用需求，将电光调制器（EOM）高阶调制边带调频技术与半导体激光器注入锁定技术相结合，利用高阶调制边带对调制频率的扩频特性及注入锁定的噪声抑制特性实现低噪声激光的高速宽带调频。项目开展了射频驱动电光调制器多阶平坦低噪声频率梳产生、激光注入锁定噪声控制、半导体激光大范围动态注入锁定等若干关键技术的研究，获得了线宽750 Hz、调谐范围100 GHz，调谐速度10 THz/s，调谐线性度误差122.17 kHz的单频可调谐激光，突破现有本振激光光源面临的线宽与调频特性难以同时满足的瓶颈问题，为高速空间卫星相干激光通信系统快速发展提供理论基础与技术支撑。