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本文叙述了偏振保持单模光纤中模式双折射的精确测量及其与拉伸之关系。正交偏振的双频激光束沿光纤的主轴注射进某一长度的光纤中。通过光纤之后,使光外差检测过程产生一个其相位与模式双折射成线性关系的差拍光电流信号。通过检测切割一短段光纤造成的差拍信号的相应变化,精确地测量了模式双折射。本文还详细分析了模式双折射与拉伸之变化关系。
This article describes the precise measurement of the mode birefringence in a polarization-maintaining single-mode fiber and its relationship to stretching. The orthogonally polarized dual-frequency laser beam is injected into a length of fiber along the major axis of the fiber. After passing through the optical fiber, the optical heterodyne detection process produces a differential photocurrent signal whose phase is linear with the mode birefringence. Mode birefringence was accurately measured by detecting the corresponding change in the beat signal caused by cutting a short length of optical fiber. This paper also detailed analysis of the relationship between mode birefringence and tensile changes.