High precision uwCFBG wavelength calculation method based on correlation coefficient

Yandong Pang; Zhiqiang Zhang; Junbing Huang; Hongcan Gu; Cong Liu

doi:10.1117/12.3030403

3 June 2024 High precision uwCFBG wavelength calculation method based on correlation coefficient

Yandong Pang, Zhiqiang Zhang, Junbing Huang, Hongcan Gu, Cong Liu

Proceedings Volume 13182, 2024 International Conference on Optoelectronic Information and Optical Engineering (OIOE 2024); 131822A (2024) https://doi.org/10.1117/12.3030403
Event: 2024 International Conference on Optoelectronic Information and Optical Engineering (OIOE 2024), 2024, Kunming, China

Abstract

In this paper, a method of detecting the central wavelength of ultra-weak chirped fiber Bragg grating is proposed, based on correlation coefficient to solve the problem of calculating the central wavelength, in the case of wideband reflection spectrum jitter. A mathematical model of the jitter spectrum of grating with piecewise step function superimposed by Gaussian noise is built. By moving the relative positions, the curve of their correlation coefficients is obtained, and the horizontal coordinate corresponding to the maximum correlation coefficient is found, to determine the central wavelength it. Then, the variation trajectories of the correlation coefficient between the odd function and the original signal at different relative positions by simulation are analyzed. Further, a variety of algorithms are used to compare and analyze the calculation results of the central wavelength of a single grating with spectral bandwidth greater than 3 nm and reflectance less than -30 dB. Finally, the ultra-weak chirped fiber Bragg grating array with 284 base cables is compared and analyzed, and the results show that the calculated range of the central wavelength is 0.17 nm. The variance of 0.05 proves that the proposed algorithm is simpler and more robust. This method has potential significance for calibration and engineering application of ultra-weak chirped fiber Bragg grating arrays.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yandong Pang, Zhiqiang Zhang, Junbing Huang, Hongcan Gu, and Cong Liu "High precision uwCFBG wavelength calculation method based on correlation coefficient", Proc. SPIE 13182, 2024 International Conference on Optoelectronic Information and Optical Engineering (OIOE 2024), 131822A (3 June 2024); https://doi.org/10.1117/12.3030403

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KEYWORDS

Correlation coefficients

Fiber Bragg gratings

Reflection

Engineering

Bragg wavelengths

Calibration

Coating

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