Abstract

Tilted fiber Bragg gratings (TFBGs) have garnered substantial research attention and have found widespread applications for sensing a diverse array of physical, chemical, and biological parameters based on optical spectrum measurements. The interrogation of a TFBG sensor typically requires a high-resolution bulky optical spectrum analyzer (OSA) due to the extremely narrow dips caused by the resonance of cladding modes. However, high-resolution OSAs can be costly and have limitations on measuring speed, limiting their practicality. In this paper, a new approach to interrogating TFBG sensors is proposed and experimentally demonstrated based on a microwave photonics technique. Instead of measuring the optical transmission spectrum, the frequency response of the TFBG sensor is acquired using a vector network analyzer. Followed by time domain analysis, sensing information embedded in the transmission spectra of the TFBG sensor subject to external perturbations is successfully extracted. Monitoring of variations in temperature, strain, and liquid level is experimentally demonstrated, and the potential for multi-parameter discrimination is also discussed. The introduced technique is easy to implement, and the corresponding characteristic sensing signal is easy to demodulate, offering a promising solution for TFBG-based sensor systems.

Department(s)

Electrical and Computer Engineering

Publication Status

Early Access

Keywords and Phrases

Fiber optic sensors; microwave photonics; tilted fiber bragg gratings; time-domain measurements

International Standard Serial Number (ISSN)

1558-2213; 0733-8724

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Institute of Electrical and Electronics Engineers; Optica Publishing Group, All rights reserved.

Publication Date

01 Jan 2024

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