Adaptive Fiber-Ring Lasers Based on Isopropanol Filled Microfiber Coupler for High-Sensitivity Temperature Sensing

Weihao Lin; Jie Hu; Fang Zhao; Siming Sun; Yuhui Liu; Shuaiqi Liu; Feihong Yu; Peng-Un Mak; Sio-Hang Pun; Perry-Ping Shum; Mang-I Vai; Liyang Shao

doi:10.3390/mi13101697

Micromachines (Oct 2022)

Adaptive Fiber-Ring Lasers Based on Isopropanol Filled Microfiber Coupler for High-Sensitivity Temperature Sensing

Weihao Lin,
Jie Hu,
Fang Zhao,
Siming Sun,
Yuhui Liu,
Shuaiqi Liu,
Feihong Yu,
Peng-Un Mak,
Sio-Hang Pun,
Perry-Ping Shum,
Mang-I Vai,
Liyang Shao

Affiliations

Weihao Lin: State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macau 999078, China
Jie Hu: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Fang Zhao: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Siming Sun: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Yuhui Liu: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Shuaiqi Liu: State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macau 999078, China
Feihong Yu: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Peng-Un Mak: Department of Electrical and Computer Engineering, University of Macau, Macau 999078, China
Sio-Hang Pun: State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macau 999078, China
Perry-Ping Shum: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Mang-I Vai: State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macau 999078, China
Liyang Shao: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China

DOI: https://doi.org/10.3390/mi13101697
Journal volume & issue: Vol. 13, no. 10
p. 1697

Abstract

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We demonstrated a new method for temperature measurement inside a fiber ring laser (FRL) cavity. Different from traditional FRL temperature sensing system which need additional filter working as a sensor, a micro-fiber coupler (MFC) was designed as a beam splitter, filter, and temperature sensor. In addition, isopropanol, a liquid with very high photothermal coefficient, is selectively filled in the MFC in order to improve the sensitivity of the system on temperature. In the dynamic range of 20–40 °C, we obtained a good temperature sensitivity of −1.29 nm/°C, with linear fitting up to 0.998. Benefiting from the advantages of laser sensing, the acquired laser has a 3 – dB bandwidth of less than 0.2 nm and a signal-to-noise ratio (SNR) of up to 40 dB. The proposed sensor has a low cost and high sensitivity, which is expected to be used in biomedical health detection, real-time monitoring of ocean temperature, and other application scenarios.

Published in Micromachines

ISSN: 2072-666X (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mechanical engineering and machinery
Website: https://www.mdpi.com/journal/micromachines

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