High-Sensitivity Humidity Sensor Based on Microknot Resonator Assisted Agarose-Coated Mach-Zehnder Interferometer

An optical fiber humidity sensor with a microfiber knot resonator (MKR) nested U-shaped Mach-Zehnder (MZ) interferometer based on the Vernier effect is proposed. While the reference arm is protected by cured ultraviolet glue, the sensing arm is coated by agarose. The Vernier effect is realized by su...

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Bibliographic Details
Published in:Journal of lightwave technology 2022-04, Vol.40 (7), p.2191-2196
Main Authors: Yi, Yating, Jiang, Yuxuan, Zhao, Haiyan, Brambilla, Gilberto, Fan, Yaxian, Wang, Pengfei
Format: Article
Language:English
Subjects:
Agarose
fiber-optic device
Humidity
humidity sensor
Mach-Zehnder interferometers
Microfibers
microknot resonator
Optical fiber sensors
Optical fibers
Optical resonators
Resonators
Response time
Sagnac interferometers
Sensitivity
Sensors
Temperature measurement
vernier effect
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Summary:An optical fiber humidity sensor with a microfiber knot resonator (MKR) nested U-shaped Mach-Zehnder (MZ) interferometer based on the Vernier effect is proposed. While the reference arm is protected by cured ultraviolet glue, the sensing arm is coated by agarose. The Vernier effect is realized by superimposing the comb-like transmission spectra of the MKR and MZ interfernce, which are designed to have slightly different free spectral ranges. Experimental results indicate that the proposed sensor can provide a maximum humidity sensitivity of 2.442 nm/%RH with a measurement range from 60% RH to 95% RH. The sensor temperature response, reversibility and repeatability are also investigated. The response time is found to be 102 ms for a change of ∼30% RH. This sensor not only retains key features and merits of the MKR, including low cost and small footprint, but also has a simpler preparation process compared with conventional sensors based on the Vernier effect.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2021.3135246