| Bragg fiber is one dimensional photonic crystal fiber, it has many good characteristics thantraditional fiber, it can be greatly expand the application fields. Use Bragg fiber in the infraredtransmission area will hava a broad application prospect.PWM and FEM method are used to optimize the structure of Bragg fiber designed in pape.RSoft software simulation was used to find Bragg fiber band gap and determined the range of latticeperiod, then COMSOL software was used to calculate the loss characteristic and to determine theBragg fiber structure with minimum loss. Then perform drawing method is chosen as infraredhollow-core Bragg fiber’s fabrication process method, and the different errors is analyzed whichmay occur during fabrication process in detail, such as the fluctuation of As2Se3material depositionthickness, the deposition length of As2Se3material, fiber drawing ratio variation, hole collapse ratevariation, PEI film contains tiny hole and unsmooth hole core. On the basis of the above, this paperfocuses on the different errors which may influence the Bragg fiber’s transmission characteristic,include using RSoft to determine the maximum error range and using COMSOL to determine theerror range with low loss. Based on the simulation analysis, the following conclusion is obtained:the fluctuation of As2Se3material deposition thickness should be controlled between-5%and+7%,As2Se3material deposition length should be more than24.734cm, fiber drawing ratio should becontrolled between8.9and9.3, when the lattice period is a constant, hole collapse rate should becontrolled between0.7and1.0, when the lattice period changes, hole collapse rate should becontrolled between0.94and1.00, the radius of the hole in PEI film should be less than0.4μm, thepoint radius in the hole core should be less than0.1μm.Finally, some useful suggestions are put forward to improve the quality of fabrication process,the results have greate significance to the fabrication processs of hollow-core infrared Bragg fiber. |
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