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Tilted fiber Bragg grating sensor interrogation system using a high-resolution silicon-on-insulator arrayed waveguide

Pavel Cheben1, Edith Post, Siegfried Janz

  • 1Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario, Canada. pavel.cheben@nrc.ca

Optics Letters
|November 19, 2008
PubMed
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We developed a compact arrayed waveguide grating (AWG) interrogator to precisely measure resonances in tilted fiber Bragg gratings (TFBGs). This system enables accurate real-time monitoring of cladding mode perturbations for advanced sensing applications.

Area of Science:

  • Photonics
  • Optical Sensing
  • Integrated Optics

Background:

  • Tilted Fiber Bragg Gratings (TFBGs) offer high sensitivity for measuring cladding mode perturbations.
  • Accurate interrogation of TFBG resonances is crucial for reliable sensing.
  • Existing interrogation systems can be bulky or lack the required resolution.

Purpose of the Study:

  • To develop a compact, high-resolution arrayed waveguide grating (AWG) interrogator system.
  • To enable simultaneous monitoring of two widely separated TFBG resonances in real time.
  • To achieve high accuracy in measuring wavelength shifts for refractometer applications.

Main Methods:

  • Designed and fabricated a silicon-on-insulator based AWG interrogator with 50 channels and 0.18 nm wavelength separation.

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  • Utilized the core mode reflection resonance of the TFBG as an internal wavelength and power reference.
  • Employed overlaying of two adjacent interference orders of the AWG for simultaneous resonance monitoring.

    • Main Results:

    • Demonstrated a compact AWG interrogator with an 8 mmx8 mm footprint.
    • Achieved simultaneous real-time monitoring of two widely separated TFBG resonances.
    • Measured wavelength shifts with a standard deviation of 1.2 pm, limited by the calibration optical spectrum analyzer resolution.

    Conclusions:

    • The developed AWG interrogator system provides a compact and high-resolution solution for TFBG refractometry.
    • The system's ability to simultaneously monitor multiple resonances enhances its utility for accurate cladding mode perturbation analysis.
    • This technology holds promise for advanced optical sensing applications requiring precise wavelength measurements.