为改善传感器的性能，微弱光强信号的检测需要载波调制和双光路补偿。
To improve its performance, a carrier modulation and double light route compensation are necessary for detecting faint optical power signals.
在光副载波复用(SCM)系统中若使用DOP作为DGD的监测信号将会遇到灵敏度低的问题。
The problem of low sensitivity will become seriously if DOP is used as the monitor signal of DGD in SCM system.
为了降低光网络单元的成本预算，我们对下行的光载波进行了上行传输开关键控信号的重调制。
We also realize wavelength remodulation for carrying upstream on-off keying (OOK) data to reduce the cost budget at the optical network unit.
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