Eickhoff W, Yen Y, Ulrich R
Appl Opt. 1981 Oct 1;20(19):3428-35. doi: 10.1364/AO.20.003428.
Real single-mode fibers generally exhibit elliptical birefringence caused by deviations of the core shape from circularity, by transverse internal stress, and by residual twist. These three contributions can be individually determined by analyzing on a Poincaré sphere the wavelength dependence of the output state of polarization of a short section of fiber with fixed input polarization. Various types of polarization eigenstates of a twisted birefringent fiber are discussed, and the resulting group delay difference is derived.
实际的单模光纤通常会表现出椭圆双折射，这是由纤芯形状偏离圆形、横向内部应力以及残余扭转引起的。通过在庞加莱球上分析具有固定输入偏振的短光纤段输出偏振态的波长依赖性，可以分别确定这三种因素的影响。讨论了扭曲双折射光纤的各种偏振本征态，并推导了由此产生的群时延差。
