设计和制作了一种用于卫星相干激光通信的偏振分光2×4 90°自由空间光学桥接器,提出了两种λ/4波片进行偏振相位补偿的方法及使用啁啾激光及解斜解调的相移测量方法。给出了数学分析、系统设计和实验结果,结果表明器件运行稳定,相位补偿精密有效,相位测量简单而精确。

A 2×4 90° free-space optical hybrid with polarization splitting is designed and fabricated for intersatellite coherent laser communication. Two phase compensation arrangements by using a λ/4 waveplate are proposed and a phase shift testing method based on the deramping method from a chirped laser is developed. The mathematic analysis,system design and experimental result are given. It is shown that this hybrid works stably,the compensation function works effectively,and the phase test is accurate and simple in configuration.