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PLC-Based Arrayed Waveguide Grating Design for Fiber Bragg Grating Interrogation System.

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  • 1Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing Information Science & Technology University, Beijing 100192, China.

Nanomaterials (Basel, Switzerland)
|September 9, 2022
PubMed
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This summary is machine-generated.

A new fiber Bragg grating (FBG) interrogation system uses an array waveguide grating (AWG) for miniaturization. This system achieves high-resolution FBG wavelength demodulation, valuable for aerospace and deep-sea exploration.

Area of Science:

  • Optoelectronics and Photonics
  • Integrated Optics
  • Sensor Technology

Background:

  • Fiber Bragg Grating (FBG) interrogators are crucial for converting FBG sensor wavelength shifts into electrical signals.
  • Existing FBG interrogation systems face challenges in miniaturization and integration.
  • Array Waveguide Gratings (AWGs) offer potential for compact and high-performance optical systems.

Purpose of the Study:

  • To design and fabricate a miniaturized and integrated FBG interrogation system.
  • To utilize a silica-based planar lightwave circuit (PLC) array waveguide grating (AWG) as the core component.
  • To achieve continuous, high-resolution FBG wavelength demodulation in the C-band.

Main Methods:

  • Fabrication of a 36-channel array waveguide grating (AWG) on silica-based planar lightwave circuits (PLC).
Keywords:
arrayed waveguide gratingfiber Bragg grating interrogatorplanar lightwave circuitsilicon photonics

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  • Integration of the AWG into a fiber Bragg grating (FBG) interrogation system.
  • Testing of the system's performance, including channel spacing, bandwidth, crosstalk, insertion loss, dynamic range, resolution, and accuracy.

    • Main Results:

    • The fabricated AWG exhibits a channel spacing of 1.6 nm, 3-dB bandwidth of 1.76 nm, crosstalk of -29.76 dB, and insertion loss of 3.46 dB.
    • The FBG interrogation system demonstrates a dynamic range of 1522.4-1578.4 nm.
    • An interrogation resolution of 1 pm and accuracy of less than 1 pm were achieved within a specific dynamic range (1523.16-1523.2 nm).

    Conclusions:

    • The developed FBG interrogation technology based on AWG enables accurate FBG wavelength demodulation.
    • The system's miniaturization and high performance make it suitable for demanding applications.
    • High potential for applications in aerospace, deep-sea exploration, and environmental monitoring.