Theoretical investigation of the bending sensing characteristics for four-core fiber bragg grating

Huimei He; Li Wang

doi:10.1117/12.864121

11 October 2010 Theoretical investigation of the bending sensing characteristics for four-core fiber bragg grating

Huimei He, Li Wang

Proceedings Volume 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 765638 (2010) https://doi.org/10.1117/12.864121
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

Bending characteristics of four-core optical fiber Bragg gratings(MCFBGs) according to bending curvature and bending direction is analyzed using coupled-mode theory and mechanics of materials in this paper. The simulated results show that, bending makes the resonant wavelength of the four-core MCFBGs shift, two FBGs that in the catercorner of square matrix cores have the same wavelength changes (▵λ₁ = ▵λ₃) , and (▵λ₂ = ▵λ₄), but have the opposition direction of shift. The wavelength difference of two FBGs at the catercorner of the square matrix (▵λ₁₃ = ▵λ₁₂) is proportional to the bending curvature. The bending sensitivity of the wavelength difference ( d(▵λ₁₃)/ dp or ( d(▵λ₂₄)/ dp is changed with a different bend-directions. The orientation of the bending was determined by the arctangent of the ratio of the wavelength difference ▵λ₁₃/▵λ₂₄ . The sensitivity of the wavelength difference between cores is twice to the sensitivity of the reflection Bragg wavelength changes.

Citation Download Citation

Huimei He and Li Wang "Theoretical investigation of the bending sensing characteristics for four-core fiber bragg grating", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 765638 (11 October 2010); https://doi.org/10.1117/12.864121

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