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A method that utilizes a fluid-filled elliptical hole configuration to improve the efficiency and quality of grating inscription in a microstructured optical fiber was proposed and analyzed. The quantitative influence of inscription beam, elliptical size, fiber parameter, and fluid index on the grating inscription was analyzed. In addition, the feasibility of utilizing a symmetrical elliptical hole configuration and a rotating inscription technique to modify the inscription energy distribution near the core region during inscription was also discussed. Simulation results show that the optimized hybrid microstructured optical fiber configuration could achieve three times of the inscription efficiency than that of a single-mode fiber.

Simulation on the Optical Field Characteristics of Grating Inscription in a Hybrid Microstructured Optical Fiber