Abstract
We study the material loss in a Bragg fiber possessing a hollow core and stratified periodic cladding layers through a perturbative method. In the present scheme, electromagnetic fields are treated via the approximate Bloch theorem in cylindrical coordinates for a loss-free Bragg fiber, and then dissipation is added as a perturbation in complex refractive indices. Analytical representation of material loss is described for TE, TM, and hybrid (HE, EH) modes, and some numerical examples are given. They are compared with results obtained by the multilayer division method, which gives very accurate solutions for cylindrically symmetric fiber structures. Results obtained by those two methods mostly agree with each other even for the lowest mode, that is, mode.
© 2013 Optical Society of America
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