这种“相差”信号提供更为清晰和详细的结果。
This "phase contrast" signal gives much clearer and detailed results.
而同一个信号在不同的时期强度相差悬殊。
The signal amplitude is quite different in the different period.
由于不同的光网络单元onu与光线路终端olt的距离不同，实际工作时到达接收端的信号的幅度，相位都相差很大。
Because the distances from different ONUs to OLT are different, the amplitudes and phases of the different signals will have significant difference when receiving the receive terminal.
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