高灵敏度光束位置信号提取的激光通信跟瞄一体化(特邀)

Integration of Laser Communication and Aiming Based on High Sensitivity Beam Position Signal Extraction(Invited)

提出一种基于四象限探测器跟瞄和通信复用的强度调制直接探测的空间光通信系统,以超声波电机驱动的双光楔为光束偏转执行单元形成光束位置跟踪的闭环系统。驱动电机转动周期为15 ms,位置分辨率为0.83μrad。经理论分析和实验验证,该系统的位置闭环跟踪−3 dB带宽约为4 Hz。当位置探测误差小于10%时,即光束探测精度小于12μrad,对应的探测灵敏度为−45.2 dBm。在10 Mbit/s的通信速率和无信号编码下,误码率为1×10^(−3)时对应的通信灵敏度为−44 dBm。验证了利用四象限探测器作为跟踪与通信复用探测器的可行性,可应用于小型化、轻量化的星间激光通信终端。

A space optical communication system with intensity modulation direct detection based on four quadrant detector tracking and communication multiplexing has been reported,which uses the dual optical wedge driven by ultrasonic motor as the beam deflection execution unit to form a closed-loop system for beam position tracking.The rotation period of the driving motor is 15 ms,and the position resolution is 0.83μrad.Through theoretical analysis and experimental verification,the position closed-loop tracking−3 dB bandwidth of this system is about 4 Hz.When the position detection error is less than 10%,that is,the beam detection accuracy is less than 12μrad,and the corresponding detection sensitivity is−45.2 dBm.At a communication rate of 10 Mbit/s and without signal encoding,the corresponding communication sensitivity is−44 dBm when the bit error rate is 1×10^(−3).It has been verified that it is feasible to use the four-quadrant detector as a tracking and communication multiplexing detector,which can be applied to small and lightweight interstellar laser communication terminals.