The model was established by finite element method, and the influence of Bragg fiber design parameters on the photonic band gap was discussed. It is found that when the thickness or refractive index of the germanium-doped glass ring is increased, the band gap will move to the long wavelength. A large mode area W-type Bragg fiber was designed by applying a layer of fluorine-doped low-refractive index glass close to the core. Calculations show that W-type Bragg fiber can effectively reduce the limiting loss and improve the bending resistance of the fiber. The core diameter of the Bragg fiber designed in this paper is 30μm, and the limiting loss is about 0.1dB/km at a wavelength of 1.06μm, and single transverse mode transmission is maintained.
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