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1 前言光纤中的磁光法拉弟效应,可用来发展测量超高压线路上大电流的光纤传感器,其重量轻、抗电磁干扰、绝缘性能好等优点已被普遍公认。为了使光纤中传输的偏振光的微小法拉弟旋转不至于被光纤固有的双折射所淹没,目前传感所用的光纤多为低双折射光纤。但在绕制安装光纤线圈时,由于不对称的应力、形变以及其它外界环境因素引起的、随机变化的附加双折射也将导致光偏振面的旋转,甚至淹没法拉弟旋转。因此,对光纤线圈的绕制安装提出了极其严格的要求。已有人提出一种新型光纤——扭转高双折射光纤。从偏振光学的角度看,该光纤呈现椭圆双折射。
1 Introduction The magneto-optical Faraday effect in optical fiber can be used to develop the optical fiber sensor for measuring high current on EHV lines. Its advantages of light weight, anti-electromagnetic interference and good insulation are generally recognized. In order to make the transmission of polarized light in the small optical Faraday rotation will not be inherent optical fiber birefringence submerged, most of the current sensing fiber used for low birefringence fiber. However, due to asymmetric stress, deformation and other external environmental factors, the random change of the additional birefringence also causes the rotation of the plane of polarization of light and even submerges the Faraday rotation when winding the optical fiber coil. Therefore, the winding of the optical fiber winding installation put forward extremely strict requirements. A new fiber-twisted high birefringence fiber has been proposed. From a polarization optics point of view, the optical fiber exhibits elliptical birefringence.