Abstract

We present numerical results on the optical power confinement factor Γ for the TE, TM, and hybrid modes in a Bragg fiber. In particular, ${\Gamma }_{\mathrm{QWS}}$ under the quarter-wave stack condition is useful for understanding various properties. We calculate Γ and ${\Gamma }_{\mathrm{QWS}}$ as a function of the core radius, cladding index contrast, and so on. Numerical results reveal that the ${\mathrm{TE}}_{01}$ mode shows the highest value of ${\Gamma }_{\mathrm{QWS}}$ among all the modes over most of the parameter ranges. This result corresponds well to that seen in the circular metallic waveguide. The ${\Gamma }_{\mathrm{QWS}}$ of the ${\mathrm{TE}}_{01}$ mode is 99% for the cladding index contrast of $n_a-n_b=0.48$, and the ratio of the core radius to wavelength $r_c∕{\lambda }_0=2.0$. An optimum value for the cladding lower index is shown as a function of the cladding index contrast.

© 2006 Optical Society of America

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