Photonic crystal fiber Fabry-Perot interferometer for nanostrain sensing based on microwave photonics

Chen Zhu; Ruimin Jie; Bo Liu

doi:10.1117/12.2685467

27 November 2023 Photonic crystal fiber Fabry-Perot interferometer for nanostrain sensing based on microwave photonics

Chen Zhu, Ruimin Jie, Bo Liu

Proceedings Volume 12771, Advanced Sensor Systems and Applications XIII; 127710W (2023) https://doi.org/10.1117/12.2685467
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

We propose and demonstrate a high-sensitivity phase-measurement-based interrogation technique enabled by microwave photonics for optical fiber Fabry-Perot interferometer (FPI) sensors. A low-coherent broadband light source is employed as the light source, and the reflection spectrum of the FPI device is modulated by microwave signals output from Port 1 of a vector network analyzer via an electro-optic modulator. The intensity-modulated optical signal goes through a long length of dispersion compensating fiber and is then detected by a highspeed photodetector. The electrical signal is sent to Port 2 of the vector network analyzer for synchronized detection at each modulation frequency to obtain the frequency response of the FPI sensor. The frequency passband of the FPI sensor in the frequency response is then located and an operating frequency within the passband is designated. By monitoring changes in the phase information of the operating frequency, changes in the optical path difference of the FPI sensor can be determined with high sensitivity. As a proof of concept, an FPI device constructed by fusion splicing a section of photonic crystal fiber (PCF) between two SMFs is employed for tensile strain sensing. Due to the low Young’s modulus of the PCF and the high sensitivity provided by the proposed phase-measurement-based interrogation approach, a high-performance strain sensor with a resolution of 60 nanostrains is revealed

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Chen Zhu, Ruimin Jie, and Bo Liu "Photonic crystal fiber Fabry-Perot interferometer for nanostrain sensing based on microwave photonics", Proc. SPIE 12771, Advanced Sensor Systems and Applications XIII, 127710W (27 November 2023); https://doi.org/10.1117/12.2685467

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KEYWORDS

Sensors

Microwave photonics

Fabry–Perot interferometry

Fiber Bragg gratings

Frequency response

Photonic crystal fibers

Modulation frequency

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