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最近,已观察到在盘绕单模光纤和成缆单模光纤之间的偏振模色散(PMD)存在着差别,本文介绍了对这一现象的实验研究.为了证明是大偏振模耦合长度还是大双折射是高偏振模色散的主要原因,而对这两种参数作了测量.结果表明,盘绕光纤和成缆光纤的模耦合长度差达50倍,这说明成缆光纤的偏振模色散较大.松管结构的光缆最易受到大偏振模耦合长度之害.通过观察偏振模色散谱在宽波长间隔内位移与温度之关系,发现内部应力是标准长途通信光纤中双折射的主要根源.
Recently, it has been observed that there is a difference in the polarization mode dispersion (PMD) between a coiled single-mode fiber and a cable single-mode fiber, and an experimental study of this phenomenon is presented in this paper.In order to prove that the coupling length of a large polarization mode is still large Birefringence is the main reason of high polarization mode dispersion, and the two parameters are measured.The results show that the difference between the mode coupling length of the coiled fiber and the cabled fiber is up to 50 times, which indicates that the polarization mode dispersion of the fiber is larger The loose tube structure is the most susceptible to the large polarization mode coupling length.The internal stress is the main source of birefringence in the standard long distance communication fiber by observing the relationship between the displacement and the temperature in the wide wavelength interval of the polarization mode dispersion spectrum.