title: Influence of strain and pressure to the effective refractive index of the fundamental mode of hollow-core photonic bandgap fibers.
abstract: We investigate the phase sensitivity of the fundamental mode of hollow-core photonic bandgap fibers to strain and acoustic pressure. A theoretical model is constructed to analyze the effect of axial strain and acoustic pressure on the effective refractive index of the fundamental mode. Simulation shows that, for the commercial HC-1550-02 fiber, the contribution of mode-index variation to the overall phase sensitivities to axial strain and acoustic pressure are respectively approximately -2% and approximately -17%. The calculated normalized phase-sensitivities of the HC-1550-02 fiber to strain and acoustic pressure are respectively 1 epsilon(-1) and -331.6 dB re microPa(-1) without considering mode-index variation, and 0.9797 epsilon(-1) and -333.1 dB re microPa(-1) when mode-index variation is included in the calculation. The latter matches better with the experimentally measured results.
authors.affiliation: Department of Electrical Engineering, Hong Kong Polytechnic University, Hong Kong, China.
authors.forename: M
authors.initials: M
authors.lastname: Pang
authors.forename: H F
authors.initials: HF
authors.lastname: Xuan
authors.forename: J
authors.initials: J
authors.lastname: Ju
authors.forename: W
authors.initials: W
authors.lastname: Jin
mesh_terms: D000162:Acoustics; D000388:Air; D004548:Elasticity; D005336:Fiber Optic Technology / Q000379:methods*; D008962:Models, Theoretical; D055100:Optical Fibers; D011108:Polymers; D011312:Pressure; D012031:Refractometry; D012822:Silicon Dioxide
chemical_list: D011108:Polymers; D012822:Silicon Dioxide