3 December 2014 A new method for reflectivity measurement of ultra-weak fiber Bragg gratings
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Abstract
An approach for reflectivity measurement of ultra-weak fiber Bragg gratings is demonstrated. The scheme uses a referenced high-reflectivity FBG to combine with the measured FBG. They have different center wavelengths. By using two referenced FBGs, the reflectivity of one measured FBG is calculated to be 0.298% and 0.287% respectively. For reflectivity measurement of ultra-weak FBG, to eliminate the influence of the reflection spectra side lobe for the referenced FBG, we get the reflection spectrum of the referenced FBG and measured FBG respectively under the same input intensity. The reflectivity of an ultra-weak FBG is measured to be 0.00916% (-40.38dB) and 0.00803%(-40.95dB) based on the two referenced FBGs. The results presents that the method is feasible.
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Peng Jiang, Peng Jiang, Wei Wang, Wei Wang, Zhengliang Hu, Zhengliang Hu, Lina Ma, Lina Ma, Yongming Hu, Yongming Hu, } "A new method for reflectivity measurement of ultra-weak fiber Bragg gratings", Proc. SPIE 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors, 92972J (3 December 2014); doi: 10.1117/12.2069416; https://doi.org/10.1117/12.2069416
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