用于高速微弱光信号的平衡探测技术研究

Research of balanced detection techniques for high speed weak optical signal

长距离高速微弱光电探测技术在激光通信中应用广泛。为了在未被噪声湮没的环境中检测出所需的微弱信号,采用平衡探测技术对单管探测和平衡探测进行对比,并且对具体的平衡探测器电路进行了理论分析和仿真,得出了在一致性系数较大(k>0.6)时平衡探测器的信噪比优于单管探测的结论。从理论上分析了单管和双管探测的最小可探测光功率。结果表明,把平衡探测技术用于高速微弱光信号探测具有很大的优越性。

Long-distance high speed weak photoelectric detection technology is widely used in laser communication.To detect the weak signal which is not buried in the noisy environment,balanced detection technology becomes more and more important. Single pipe coherent detection and balanced coherent detection were compared firstly. After theoretical analysis and numerical simulation,signal-to-noise ratio of the balanced detection was greatly superior to that of the single tube detection when the consistency coefficient was bigger than 0. 6. The minimum detectable optical power of the single tube detection and balanced detection was analyzed. The results prove the superiority of balanced detection technology used in high speed weak optical signal detection.