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零差相干光通信能够实现极高的通信速率和接近量子极限的灵敏度,是新一代空间通信领域极具潜力的通信体制。以窄线宽激光器作为本振源,结合90°光学混频技术和科斯塔斯光学锁相环技术,实现了信号光的零差相干接收。试验结果表明,信号光和本振光经过90°光学混频后I、Q两路信号相位差保持90°,科斯塔斯光学锁相环可以长时间实现信号光和本振光之间的相位锁定,接收速率为2Gbps的二进制相移键控(BPSK)信号,试验结果表明,该接收机能够很好地实现基带信号解调。
Zero-difference coherent optical communication can realize the extremely high communication speed and the sensitivity close to the quantum limit, and is a promising communication system in the new generation of space communication. With narrow linewidth laser as the local oscillator, combined with 90 ° optical mixing technology and Costas optical phase-locked loop technology, the coherent reception of signal light is realized. The experimental results show that the phase difference between I and Q signals keeps 90 ° after 90 ° optical mixing between the signal light and the local light, and the Kostas optical phase locked loop can realize the phase between the signal light and the local light for a long time Lock, receive binary phase shift keying (BPSK) signals at a rate of 2 Gbps, the experimental results show that the receiver can well achieve baseband signal demodulation.