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为了满足超远程和高速空间激光通信的需求,设计了一种以1.06μm光纤激光4支路相控阵作为发射源的通信系统结构。采用53 Mb/s、120 Mb/s、155 Mb/s速率调制的伪随机序列,实验了相控阵种子源和一条支路处调制的2种方案。结果表明:相同速率下,种子源调制的接收眼图质量较好,通过相位控制,可以进一步提高接收质量。实验中,研究了2条支路光分别调制的相控阵多载波特性,调制信号采用5/5.08 MHz及20/40 MHz两组正弦波,经光束合成和相位控制,在接收端观测到相应的频域信号。实验初步验证了光纤激光相控阵空间通信系统的可行性。
In order to meet the demand of laser communication in ultra-long-distance and high-speed space, a communication system structure with 1.06μm fiber laser 4-branch phased array as a transmission source was designed. Two kinds of schemes of phased array seed source and one branch modulation were tested with pseudo-random sequences of 53 Mb / s, 120 Mb / s and 155 Mb / s. The results show that the quality of receiving eye pattern modulated by seed source is better under the same speed, and the receiving quality can be further improved by phase control. In the experiment, the multi-carrier characteristics of phased array modulated respectively by two branch lights are studied. The modulated signals are composed of two sets of sine waves of 5 / 5.08 MHz and 20/40 MHz. After the beam synthesis and phase control, the corresponding signals are observed at the receiving end Frequency domain signal. The feasibility of the fiber laser phased array communication system was verified experimentally.