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An air-core photonic bandgap fiber (PBGF) for gas sensing with high sensitivity is designed. The coupling core modes and surface modes in air-core photonic bandgap fiber cause large propagation losses and will deteriorate the performance of PBGF. There is a relationship between the air-core radius and the surface modes. According to the simulation results, at a special core radius, no surface modes...
A new design of photonic crystal fiber based on octagonal array of air holes in the silica background is proposed for using as a sensor node in the optical network protection system of gas pipelines. The aim of our design is achieving more sensitivity and lowering the confinement loss. In addition, introducing a hollow high index ring with an air hole in the center of fiber simultaneously enhances...
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