Abstract

We present the fiber loss estimation, contour loss curves, and fiber loss spectra for the TE0μ mode transmission in a Bragg fiber; numerical results are especially focused on the TE01 mode. A fiber loss of the order of 0.01–0.1dBkm can be achieved using cladding material of 10dBkm in loss. The loss of the hollow core fiber is simply formulated in terms of the constituting cladding losses, fiber structural parameters, and operation wavelength λ0 under the quarter-wave stack (QWS) condition. It is effective for decreasing the loss of the cladding lower-index layer to get a low-loss Bragg fiber. The fiber loss is minimized at an optimum cladding lower-index nb,opt. The nb,opt can be expressed by nb,opt, which is a function of cladding higher-index na, core index nc, and cladding layer loss ratio for a sufficiently large value of normalized core radius, rcλ0, under the QWS condition. The optimized fiber loss is inversely proportional to the product of (nanc)32 and (rcλ0)3 for a sufficiently large rcλ0.

© 2007 Optical Society of America

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