Abstract
Couplings of core mode to guided cladding and unguided radiation modes
in fiber Bragg and long-period gratings are investigated by a unified approach
based on complex mode matching method (CMMM). With the combination of the
perfectly matched layer (PML) and the perfectly reflecting boundary (PRB),
the continuous radiation modes can be well represented by a set of discrete
complex modes so that simulation of coupling to radiation modes is greatly
simplified and may be treated in the same fashion as guided modes. Numerical
results of fiber Bragg and long-period gratings with refractive index of the
outer cladding lower, equal, and higher than that of the inner cladding indicate
that the unified approach is highly effective in the simulation of couplings
to cladding and radiation modes.
© 2009 IEEE
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