Abstract

The performance of a fiber optic Fabry-Perot (F-P) sensor largely depends on the spectral characteristics of F-P interference, nevertheless there is little research on the spectral characteristic, such as the asymmetry shapes which are often observed in practical experiments. Here, a simple analytical formula for simulating the reflected spectrum of a F-P resonator have been provided, based on which the asymmetry spectral shape can be diversified through adjusting the refined parameters in the analytical formula. In addition, the composite film of Pt/Ge with different thickness on fiber tip has been theoretically demonstrated to change the parameters, and the F-P interferometer composed by composite film of Pt/Ge on fiber tip and gold film has been simulated to exhibit variated asymmetric reflection spectra. Meanwhile, the reflection spectrum from fiber F-P interferometer based on the composite film deposited on the end face of optical fiber has been experimentally proven to change according to the thickness variation of Ge film. Finally, a fiber based miniature extrinsic Fabry-Perot interferometer (EFPI) showing a saw tooth wave shape spectrum has been fabricated to sense static pressure through a dual-wavelength based intensity demodulation scheme, which possesses the potential to overcome the offset between sensitive and dynamic range for a traditional sensor.

Sapphire Fabry–Perot interferometer for high-temperature pressure sensing

Z. Wang, J. Chen, H. Wei, H. Liu, Z. Ma, N. Chen, Z. Chen, T. Wang, and F. Pang
Appl. Opt. 59(17) 5189-5196 (2020)

Conditions of pressure scanning of a Fabry-Perot interferometer over a wide spectrum range

J. M. Helbert, P. Laforie, and P. Miche
Appl. Opt. 16(8) 2119-2126 (1977)

Asymmetrical properties of the optical reflection response of the Fabry–Pérot interferometer

Remo Giust, Jean-Marie Vigoureux, and Michael Sarrazin
J. Opt. Soc. Am. A 17(1) 142-148 (2000)

Enhanced wide-range gas pressure sensing with an all-solid open Fabry–Pérot interferometer

Xinyu Zhao, Jiandong Bai, Yongqiu Zheng, Zhenyin Hai, Jiamin Chen, Junping Zhang, Yonghua Wang, and Chenyang Xue
Opt. Express 31(18) 29994-30004 (2023)

Fiber-optic gas pressure sensing with a laser-heated silicon-based Fabry–Perot interferometer

Guigen Liu and Ming Han
Opt. Lett. 40(11) 2461-2464 (2015)