Abstract

We propose and experimentally demonstrate a multiplexed high-temperature Fabry-Pérot (FP) fiber sensing system interrogated by dispersive microwave-photonic frequency-time domain analysis (DM-FTDA). In the proposed architecture, incoherent broadband probing light is modulated by radio-frequency (RF) signals and then reflected by a parallel network of hollow-core photonic crystal fiber FP (HCPCF-FP) sensors. A chirped fiber Bragg grating provides strong dispersion to map the composite FP spectral response into a well-defined microwave transfer function. Unlike conventional optical Fourier-domain multiplexing that requires deliberate cavity-length allocation, the proposed approach achieves multiplexing via delay-dominated discrimination. Distinct delay fibers are assigned to each sensor branch, and an inverse Fourier transform of the measured RF response produces separable time-domain features for individual sensors, enabling demodulation for sensors with closely matched cavity lengths. A three-sensor HCPCF-FP array is validated to ∼1000 °C, exhibiting linear time-shift responses, with worst-case apparent inter-channel crosstalk of 2.46% under the present drift conditions. These results establish DM-FTDA as a scalable microwave-photonic interrogation framework for multiplexed FP sensing in harsh thermal environments without complex optical acquisition.

Department(s)

Electrical and Computer Engineering

Publication Status

Open Access

International Standard Serial Number (ISSN)

1094-4087

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2026 Optica Publishing Group, All rights reserved.

Creative Commons Licensing

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Publication Date

01 Jun 2026

PubMed ID

42271856

Download

Full Text Link

Share

 
COinS