Optical loss estimation in a Bragg fiber

摘要

We present the fiber loss estimation, contour loss curves, and fiber loss spectra for the TE0 mu mode transmission in a Bragg fiber; numerical results are especially focused on the TE01 mode. A fiber loss of the order of 0.01-0.1 dB/km can be achieved using cladding material of 10 dB/km 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 lambda(0) 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 n(b10pt). The n(b,opt) can be expressed by n(b,opt)(x), which is a function of cladding higher-index n(a) core index n(c), and cladding layer loss ratio for a sufficiently large value of normalized core radius, r(c)/lambda(0), under the QWS condition. The optimized fiber loss is inversely proportional to the product of (n(a) - n(c))(3/2) and (r(c)lambda(0))(3) for a sufficiently large r(c)/lambda(0). (c) 2007 Optical Society of America.