Abstract

We present numerical results on dispersion relation and electromagnetic fields in a Bragg fiber. Discussions are focused on the hybrid modes. Dispersion relations for TE, TM, and hybrid modes are investigated in four different ways. It is shown that the HE11 mode is the lowest-order mode and the TM01 mode is the first higher-order mode. A photonic bandgap is observed in the dispersion relation if the parameters are appropriately changed. We study the influence of a deviation from the quarter-wave stack condition on the dispersion curve and electromagnetic fields. The deviation has little influence on dispersion characteristics. Electromagnetic fields of hybrid modes vanish in the cladding interfaces under the quarter-wave stack condition. Characteristics of the Bragg fiber are related with those in the circular metallic waveguide.

© 2006 Optical Society of America

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