Variable optical reflector and strain sensor using multimode fiber Bragg grating and mode conversion

Zhihao Chen; Xiufeng Yang; Jun Hong Ng; Xiaoqun Zou; Chao Lu

doi:10.1117/12.623379

23 May 2005 Variable optical reflector and strain sensor using multimode fiber Bragg grating and mode conversion

Zhihao Chen, Xiufeng Yang, Jun Hong Ng, Xiaoqun Zou, Chao Lu

Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.623379
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium

Abstract

We report on a narrow band optical fiber filter utilizing a multimode fiber Bragg grating and fiber mode scrambler in order to tune its reflectivity that is useful as variable optical reflector and strain sensor. A change of reflectivity from 81% to 2% is achieved. We develop a novel fiber Bragg grating strain sensor that allows strain to be applied in the portion of the multimode fiber without grating. Particular advantages of this strain sensor are simple design, low system cost and high sensitivity. A strain sensitivity of 0.0013%/microstrain in change of reflectivity and large dynamic range (0-7,000 microstrain) are demonstrated. The strain sensitivity can be improved greatly by using efficient mode conversion structure in the device.

Citation Download Citation

Zhihao Chen, Xiufeng Yang, Jun Hong Ng, Xiaoqun Zou, and Chao Lu "Variable optical reflector and strain sensor using multimode fiber Bragg grating and mode conversion", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); https://doi.org/10.1117/12.623379

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