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Proceedings Paper

Theoretical investigation of the bending sensing characteristics for four-core fiber bragg grating
Author(s): Huimei He; Li Wang
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Paper 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.

Paper Details

Date Published: 11 October 2010
PDF: 7 pages
Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 765638 (11 October 2010); doi: 10.1117/12.864121
Show Author Affiliations
Huimei He, Beijing Univ. of Technology (China)
Beijing Univ. of Chemical Technology (China)
Li Wang, Beijing Univ. of Technology (China)


Published in SPIE Proceedings Vol. 7656:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Yudong Zhang; Jose M. Sasian; Libin Xiang; Sandy To, Editor(s)

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