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由于千兆无源光网络系统中的上行光信号采用高速突发模式,故对其特性的检测是实现实时光层监测的难点。详细分析了上行光信号的传输特性、帧开销及噪声模型。并在此基础上,设计了一种检测方案,该方案通过高阻抗的前置放大器将信号引出,不影响原系统的正常工作,从而满足了实时检测的需要;通过峰值检波电路将高频突发信号降为低频进行处理,大大降低了检测的难度;在求出信号的平均功率后,利用底层光接收机模块中自带的限幅放大与数字判决功能修正误差。由于该方案对输入信号的信噪比有较大提升,且利用了系统的数字判决功能获取信号的占空比信息,故其实现成本低廉,检测精度理想。实验仿真的结果证明了该方案的可行性。
Since the uplink optical signal in the gigabit passive optical network system adopts the high-speed burst mode, the detection of its characteristics is a difficult point to realize the real-time optical layer monitoring. The transmission characteristics, frame overhead and noise model of uplink optical signal are analyzed in detail. Based on this, a detection scheme is designed, in which the signal is led out through the high-impedance preamplifier without affecting the normal operation of the original system, thus meeting the needs of real-time detection. By using the peak detection circuit, The signal is reduced to low frequency for processing, which greatly reduces the difficulty of detection. After the average power of the signal is obtained, the error is corrected by using the limiting amplification and the digital decision function in the bottom optical receiver module. Because this scheme has greatly improved the signal-to-noise ratio of the input signal and utilizes the digital decision function of the system to obtain the duty cycle information of the signal, the method has the advantages of low cost and good detection precision. The result of experiment simulation proves the feasibility of the scheme.