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Algorithm of FBG Spectrum Distortion Correction for Optical Spectra Analyzers with CCD Elements.

Vladimir Anfinogentov1, Kamil Karimov1, Artem Kuznetsov1

  • 1Department of Radiophotonics and Microwave Technologies, Kazan National Research Technical University Named after A.N. Tupolev-KAI, K. Marx Str. 10, 420111 Kazan, Russia.

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Summary

This study introduces an algorithm to correct nonlinear spectrum distortions in charge-coupled device (CCD) detectors. The method calibrates optical spectrum analyzers to improve measurement accuracy for fiber Bragg gratings and sensors.

Keywords:
CCDcharge-coupled device elementsfiber Bragg gratingfiber Bragg sensorsfiber optic interrogatorfiber optic sensorsnonlinear spectrum distortionsoptical spectrum analyzersignal exposition time

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Metrology

Background:

  • Charge-coupled device (CCD) elements exhibit nonlinear spectrum distortions due to variations in signal exposition time (Time of INTegration - TINT).
  • These distortions introduce errors in determining the central wavelength of fiber Bragg gratings (FBGs) and spectrally sensitive sensors.
  • Inaccurate spectral measurements negatively impact the overall accuracy of optical measuring systems.

Purpose of the Study:

  • To propose and validate an algorithm for correcting nonlinear spectrum distortions in optical spectrum analyzers utilizing CCD detectors.
  • To mitigate errors in spectral measurements caused by varying TINT.
  • To enhance the accuracy of systems employing FBGs and spectrally sensitive sensors.

Main Methods:

  • Development of a correction algorithm for nonlinear spectral distortions.
  • Utilizing optical spectrum analyzers with CCD receivers.
  • Implementing preliminary calibration of the spectrum analyzer.
  • Applying mathematical signal processing for spectral correction.

Main Results:

  • The proposed algorithm effectively corrects nonlinear spectrum distortions.
  • Calibration and mathematical processing significantly reduce errors associated with different TINT values.
  • The accuracy of spectral measurements, particularly for FBG central wavelengths, is improved.

Conclusions:

  • The developed algorithm provides a viable solution for correcting nonlinear spectral distortions in CCD-based spectrum analyzers.
  • Accurate spectral measurements are achievable by combining analyzer calibration with signal processing techniques.
  • The method enhances the reliability and precision of optical measurement systems reliant on spectral analysis.