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Pmd optical fiber is the fiber birefringence caused by the fiber core crystal, the birefringence of the fiber core in the optical fiber and cable applications may change is complex, and currently a lot of papers on fiber external factors, including mechanical 更多：https://www.bmcx.com/ , electromagnetic and temperature fiber pmd may have an impact are discussed. The experiments show that the fiber in a small radius bend and twist state, fiber pmd there are some changes. Single-mode fiber pmd is determined mainly by the fiber itself, the internal factors are very important.

Due to fiber optic PMD is generated by the fibre core Crystal fiber birefringence causes, may be on the core layer of the optical fiber-optic cable double refractive index change is complex, at present a lot of documents on optical fiber external factors such as mechanical, electromagnetic and temperature effect on fiber PMD may have been dealt with. Experiments showed that fiber in a small radius of bent and distorted State 更多：https://www.bmcx.com/ , fiber PMD has some changes. Single-mode fiber PMD mainly decided by the fiber itself, that is, internal factors are very important.

Because fiber PMD by fiber is the core layer of crystal optical fiber produce birefringence cause, in the optical fiber &cable application of optical fiber core layer may double refractive index change is complex, and the domestic many literature on optical fiber external factors including machinery, electromagnetic and temperature on optical fiber PMD may affect are discussed in this paper. Experiments show that 更多：https://www.bmcx.com/ ,Optical fiber bending distortion in the small radius and state, optical fiber PMD have certain change. Single-mode optical fiber PMD mainly by fiber itself decision, namely internal factors are very important.

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