Numerical analyses for thinned fiber Bragg grating under uneven surrounding refractive index environment

Bin-bin Luo; Ming-fu Zhao; Xiao-jun Zhou; De-yi Huang; Shao-fei Wang; Xue-mei Cao

doi:10.1117/12.903961

15 November 2011 Numerical analyses for thinned fiber Bragg grating under uneven surrounding refractive index environment

Bin-bin Luo, Ming-fu Zhao, Xiao-jun Zhou, De-yi Huang, Shao-fei Wang, Xue-mei Cao

Author Affiliations +

Proceedings Volume 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation; 832111 (2011) https://doi.org/10.1117/12.903961
Event: Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 2011, Yunnan, China

Abstract

Based on the fiber waveguide models, a modified transfer matrix method was utilized to calculate the reflection spectrum of the thinned fiber Bragg grating (ThFBG) under the uneven surrounding refractive index (SRI) environment. Tow SRI ranges, including the high SRI region (from 1.42 to the fiber cladding index) and the low ones (from 1.33 to about 1.36), were considered. Numerical results showed that the responsive characteristics of the reflectance spectrum of the ThFBG were closely related to the properties of the SRI distribution, first, the original reflection spectrum of the ThFBG would split into many tinny resonant peaks and the reflectance spectrums are asymmetric since the uneven SRI distributions, second, the number of the resonant peaks, the decline of the amplitude, and the degree of the asymmetric of the reflectance spectrums would increase as the increase in the SRI gradient and the D-value of the SRI between the tow ends of the ThFBG. The same numerical approach could be used to analyze the responsive characteristics of the ThFBG under the uneven medium environment where the SRI distribution was any other functions.

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Bin-bin Luo, Ming-fu Zhao, Xiao-jun Zhou, De-yi Huang, Shao-fei Wang, and Xue-mei Cao "Numerical analyses for thinned fiber Bragg grating under uneven surrounding refractive index environment", Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 832111 (15 November 2011); https://doi.org/10.1117/12.903961

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KEYWORDS

Fiber Bragg gratings

Refractive index

Reflectivity

Bismuth

Cladding

Sensors

Numerical analysis

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