摘要
本文提出了计算扁保偏光纤双折射的一个近似方法。首先建立了扁保偏光纤的多层矩形介质波导模型,再用类似于Marcatili解矩形介质波导方法,将多层矩形波导分解为两个垂直交叉的多层平板波导,最后求解多层平板波导得到矩形波导的传播常数和双折射。用这一方法计算了双折射与扁保偏光纤结构参数,如应力包层掺硼浓度、椭圆度和归一化频率等的关系曲线,可供设计和工艺人员参考。
In this paper, we presented a method to calculate the birefringce for arectangular polarization maintaining fiber. At first, the multilayer rectangulardielectric waveguide model was set up for the rectangular polarization mainta-ining fibers. By using a method similar to Marcatili's method, a multilayerrectangular waveguide was then divided into two perpendicular multilayer planarwaveguides. Solving the multilayer planar waveguides,we obtained the propaga-tion constant of the rectangular waveguide and hence the birefringence of thefiber. Birefringence, as a function of the parameters of polarization maintainingfibers, has been calculated by using this method. The calculated curves areessential for design and fabrication of rectangular polarization maintaining
关键词
单模光纤
双折射
单模光纤
single mode fibers
birefringent single mode fibers
