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Opt Express. 2003 Jun 2;11(11):1310-21.

Mode classification and degeneracy in photonic crystal fibers.


Based on supercell lattice method, a novel full vector model is presented to analyze the photonic crystal fibers (PCF). From symmetry analysis of modes of a waveguide, we classify the modes of PCF into nondegenerate or degenerate pairs according to the minimum waveguide sectors and its appropriate boundary conditions. We present the modes of PCF can be labeled by its step index fiber analogs, except the modes with the same symmetry as PCF. The doublet of the degenerate pairs in which both have the same symmetry as PCF will be split into two nondegenerate modes.


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