在相干光通信等方面，要求信号光与本地振荡光偏振方向相匹配。
The polarization direction of signal is required to match with that of local oscillator.
较长的本地环路需求某种形式的放大机制以维持信号强度。
Longer loop lengths require some form of ampli? Cation in order to maintain signal strength.
较长的本地环路需求某种形式的放大机制以维持信号强度。
Longer loop lengths require some form of ampli? Cation in order to maintain signal strength.
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