A photonic crystal fiber (PCF) structure in Ga–Sb–S-based chalcogenide glass has been designed for nonlinear applications. The propagation characteristics of the designed structure have been investigated by employing COMSOL multiphysics software based on a full-vectorial finite element method. The proposed PCF structure possesses a nonlinear coefficient as high as 14.92 W−1 m−1 with the effective mode area of 3.37 μm2 at the operating wavelength of 1.55 μm. The proposed structure exhibits a flat and low dispersion value between spectral spanning 2.4 and 2.7 μm with a maximum dispersion variation of 20 ps/nm km. To the best of our knowledge, the PCF design is investigated for first time in Ga–Sb–S-based chalcogenide glass. The structure possesses a zero dispersion wavelength value at 2.6 μm. The structure is a promising candidate for nonlinear applications, such as midinfrared supercontinuum generation, slow-light generation, and midinfrared fiber lasers.
Propagation characteristics of a cladding doped defect-core large mode area W-type photonic crystal fiber have been
investigated by using finite element method. In the proposed structure the central air hole has been removed to form the
defect core and the second layer of cladding rings around the central core have been selectively doped with different
concentration of fluorine to tune the refractive index of the doped silica rods. The bend loss, dispersion, effect of bending
on dispersion, and nonlinear coefficient of the proposed photonic crystal fiber design has been numerically investigated.
The proposed W-type photonic crystal fiber has low bend loss, low dispersion, large-mode-area with low value of
nonlinear coefficient at wavelength of 1.55μm. The structure can be utilized for telecommunication applications, for
applications in high power fiber lasers, amplifiers and sensors.
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