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Optical sensor interrogation with a blazed fiber Bragg grating and a charge-coupled device linear array.

Alexander G Simpson1, Kaiming Zhou, Lin Zhang

  • 1Photonics Research Group, Aston University, Aston Triangle, Birmingham B4 7ET, United Kingdom. appopt@george-simpson.co.uk

Applied Optics
|January 13, 2004
PubMed
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This study introduces blazed fiber Bragg gratings (BFBGs) for interrogating wavelength division multiplexed (WDM) optical sensor arrays. This cost-effective BFBG-CCD system offers high performance for WDM sensor interrogation.

Area of Science:

  • Photonics and Optical Sensing
  • Fiber Optic Sensors
  • Interrogation Techniques

Background:

  • Wavelength division multiplexing (WDM) is crucial for multi-sensor fiber optic systems.
  • Traditional interrogation methods often involve costly tunable filters.
  • Efficiently interrogating WDM sensor arrays requires high spectral-spatial resolution and signal quality.

Purpose of the Study:

  • To investigate the use of blazed fiber Bragg gratings (BFBGs) for interrogating WDM in-fiber optical sensor arrays.
  • To demonstrate a low-cost alternative to existing WDM sensor interrogation techniques.
  • To analyze the performance characteristics of a BFBG-based interrogation system.

Main Methods:

  • Utilizing blazed fiber Bragg gratings (BFBGs) to outcouple light from the fiber core.

Related Experiment Videos

  • Employing a low-cost charge-coupled device (CCD) array for light detection.
  • Performing comprehensive system performance analysis, including spectral-spatial resolution, signal-to-noise ratio, bandwidth, and drift measurements.

    • Main Results:

    • BFBGs effectively outcouple light with sufficient power for detection by a CCD array.
    • The system achieves a WDM separation of 75 rhom, a signal-to-noise ratio >45 dB, a 70 nm bandwidth, and drift of 0.1 rhom.
    • The BFBG-CCD technique is demonstrated to be polarization-state insensitive.

    Conclusions:

    • Blazed fiber Bragg gratings provide a practical and extremely low-cost method for interrogating WDM in-fiber optical sensor arrays.
    • The BFBG-CCD spectral analysis technique is a viable and cost-effective alternative to traditional tunable filter approaches.
    • This approach offers high performance metrics suitable for various sensing applications.