The main polarization mode and coupling mode in PM fiber has some optical path difference because of internal birefringence.
保偏光纤内部的高双折射，使得其内部传播的偏振主模和耦合模之间存在着一定大小的光程差。
Optical Coherence Domain polarization (OCDP) technology has been widely used to measure the mode coupling in polarization-maintenance fibers (PMF).
光相干域偏振检测技术广泛应用于保偏光纤中的偏振模式耦合测量和分析。
The quantity in relation to the coupling efficiency of an optical fiber:lasing mode, divergence angle, numerical aperture, focal diameter and precision optical fiber coupler are discussed.
围绕光纤耦合效率相关的量：激光模式、发散角、数值孔径、焦斑直径、精密光纤耦合器等问题进行了讨论；
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