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Fiber Bragg grating sensor interrogation using edge-filtering with long period grating modulated light source

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Abstract

We propose an Fiber Bragg Grating (FBG) peak detection method using edge-filtering technique with Long Period Grating (LPG)-modulated light source. A low loss-band of LPG is chosen, where the intensity varies linearly over a certain wavelength range. The broadband light source is passed through the Long Period Grating and split using a 3 dB coupler. The modulated light is separately fed to two FBG using Y-couplers. The reflected lights from FBG are measured using optical power meter. The variation in the FBG peak wavelength due to measurand will cause change in the light power detected by the power meter. The proposed method of FBG peak detection is simple, dynamic, and cost-effective. The technique has been experimentally implemented for measurement of strain and temperature and the corresponding sensitivities are obtained as 1.01 pm/με and 9.8 pm/°C.

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Acknowledgements

The work is partially supported by ISI, Kolkata (TIH) under the project NM-ICPS, DST, MHRD, Govt. of India.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi, India

    Sunil Kumar, Swapan Kumar Ghorai & Somnath Sengupta

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  1. Sunil Kumar
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  2. Swapan Kumar Ghorai
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  3. Somnath Sengupta
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Contributions

In the manuscript “Fiber Bragg Grating Sensor Interrogation using Edge-filtering with Long Period Grating modulated light source” we have contributed as, SK carried out the study of all the parameters which are used in the proposed peak detection technique, the design of peak detection algorithm, and the result analysis. The experimental setup is done by SKG. The drafting and manuscript writing is carried out by SS.

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Correspondence to Sunil Kumar.

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Kumar, S., Ghorai, S.K. & Sengupta, S. Fiber Bragg grating sensor interrogation using edge-filtering with long period grating modulated light source. Opt Quant Electron 55, 847 (2023). https://doi.org/10.1007/s11082-023-05120-0

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