A model-based parameter estimation approach for numerical analysis of single-mode optical fibers

An efficient numerical method is proposed and implemented for the analysis of propagation characteristics of single-mode optical fibers with arbitrary refractive index profile. The method follows the concept of the so-called model-based parameter estimation, and the Pade algorithm is used to constru ct a low-order rational approximant of the spectral domain Green's function , obtained by solving a hierarchy of static problems, The sought eigenfrequ ency and held distribution are then estimated by computing, respectively, t he dominant pole and the related residual of the rational approximant. A nu mber of profiles are analyzed and experiments show that very accurate resul ts can be cheaply obtained through this technique.