用保偏光纤作为传感光纤的分布式光纤传感器，被测外界量引起保偏光纤中传播的两正交偏振模的相互耦合。
For a distributed fiber sensor taking a polarization-maintaining fiber as sensing fiber, the environment factors induce the orthogonal polarization modes propagated in the fiber coupling each other.
分析了偏振模耦合原理的分布式光纤传感器的自相干与互相干光；
Phenomena of self-coherence and mutual-coherence of the distributed fiber optic sensor based on the principle of polarized-mode coupling are analyzed.
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