Abstract
In this paper, the Equivalent Step-Index-Fiber Method (ESFM) for multicladding fibers is applied to microstructured polymer optical fibers (MPOFs). Based on an average model, this method is used to analyze one type of MPOFs with ring structures and the results obtained are compared to that of the multipole method. Meanwhile, these results indicate that the type of MPOF can enable single-mode to operate with large mode areas at optical wavelengths and that the size and the arrangement of the holes and the dimension of the effective core radius have effect on the characteristic of the MPOF. The MPOF with ring structure can be acted like a multicladdding fiber if the hole or the air-filling fractions in these ring structures is small enough.
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