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提出了一种基于自相位调制和带通滤波的全光误码指示新方法.放大后的原比特流经过高非线性光纤的自相位调制和带通滤波器的带通滤波后输出误码指示信号流,原比特流中的误码对应误码指示信号流中的高峰值功率脉冲,而原比特流中的“1”码和“0”码对应误码指示信号流中的低峰值功率脉冲,并且误码指示信号流与经过光延迟线的原比特流同步.因此,仅需在误码指示信号流中设置一个阈值就能判定原比特流中误码的位置.通过数值实验,我们对速率为80Gb/s的归零码系统进行了验证.该方法可作为未来采用归零码型的超高速光传输系统中误码指示的一种可选途径.
A new method of all-optical error indication based on self-phase modulation and band-pass filtering is proposed. The original bit stream after amplification is output through the self-phase modulation of a highly nonlinear fiber and the band-pass filter output error indication The bit error rate in the original bit stream corresponds to a high peak power pulse in the bit error rate signal flow. The “1” code and the “0” code in the original bit stream correspond to the error indication signal stream Low peak power pulse and the error indication signal stream is synchronized with the original bit stream passing through the optical delay line so that the position of the bit error in the original bit stream can be determined only by setting a threshold value in the error indication signal stream, Experiment, we verify the zero-return system with the speed of 80Gb / s.This method can be used as an alternative way of error indication in ultra-high-speed optical transmission system adopting zero-return type in the future.