光学相干接收机前端在星间激光通信链路中的应用

Optical Coherent Receiver Front End for Inter-Satellite Laser Communication Link

文章提出了光学相干接收机前端的新概念，该前端可以获得PSK（相移键控）通信数据中的光相位偏差信号以及空间跟踪偏差，而无需任何额外的跟踪传感器，从而缩小卫星间激光通信终端规模。这款新型接收机前端由一个带自由空间光学元件的90度光混频器、分段光电二极管和射频电子元件组成，不仅能实现同相和正交分量的平衡检测，还能实现角度偏差信号的外差检测。

This paper presents the phase error signals in PSK（ phase new concept of optical coherent receiver front end which can obtain optical shift keying） communication data as well as spatial tracking error without any extra tracking sensor, leading to downsizing of inter - satellite laser communication terminals. This new receiver front end consists of an optical 900 optical hybrid mixer with free space optical components, segmental photo de- tectors and RF electronics,to realize not only balanced detection of both in - phase and quadrature components but also heterodyning detection of tip/tilt error signals.