Abstract
A full vector method based on supercell lattice method is applied for modeling the microstructured optical fibers (MOF). With this new method, the class and degeneracy of modes in MOF are discussed based on symmetry analysis. We classify the modes of MOF into nondegenerate or degenerate pairs according to the minimum waveguide sectors and its appropriate boundary conditions. It is shown that the modes of MOF can be labeled by its step index fiber analogs, except the modes with the same symmetry as MOF. The doublet of the degenerate pairs in which both have the same symmetry as MOF will be split into two nondegenerate modes by the reduced symmetry of the fiber.
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