中国光学（中英文）2025，Vol.18Issue(5)：1027-1035,9.DOI:10.37188/CO.2025-0068
Lyot-Sagnac与Fabry-Pérot级联增敏的光纤温度传感器
Sensitivity-enhanced fiber-optic temperature sensor using cascaded Lyot-Sagnac and Fabry-Pérot interferometers
摘要
Abstract
To effectively enhance detection sensitivity and practicality,this paper proposes a fiber-optic tem-perature sensor based on a cascaded Lyot-Sagnac sensing structure sensitized by the Vernier effect and a Fabry-Pérot interferometer(FPI).The Lyot-Sagnac structure is fabricated by splicing polarization-maintain-ing fibers(PMFs)of different lengths with a 90° rotation,while the FPI is constructed using a hollow-core photonic crystal fiber(HCPCF)as the Fabry-Pérot cavity.The results of theoretical analysis demonstrates that the Lyot-Sagnac structure fabricated via the 90° rotated splicing method exhibits a well-defined output spectral envelope.When cascaded with an FPI,it can significantly improve temperature detection sensitivity through the Vernier effect.The experimental results show that the temperature sensitivity of the cascaded sensor is 12.56 nm/℃ and 92.77 nm/℃ when utilizing PMFs of different lengths in the Lyot-Sagnac sensor structure as the sensing regions.Compared to the standalone Lyot-Sagnac interferometeric structure,the sens-itivity of the proposed sensor is improved by approximately 57 times.In addition,under the same measure-ment bandwidth,the measurement range of PMF1 mode is 9.3 times that of PMF2 mode.Therefore,com-pared to the traditional vernier-effect-based fiber-optic temperature sensors,the dual-response-mode temper-ature sensor proposed in this paper not only exhibits superior detection sensitivity,but also enables effective adaptation to application scenarios requiring different detection ranges and sensitivity levels using the same spectral detection equipment,providing a new idea for developing tunable-performance fiber-optic temperat-ure sensors.关键词
光纤温度传感器/Lyot-Sagnac结构/游标效应/Fabry-Pérot干涉仪Key words
fiber-optic temperature sensor/Lyot-Sagnac structure/vernier effect/Fabry-Pérot interferometer分类
信息技术与安全科学引用本文复制引用
张国生,陈宇雷,柴国强,韩建宁..Lyot-Sagnac与Fabry-Pérot级联增敏的光纤温度传感器[J].中国光学（中英文）,2025,18(5):1027-1035,9.基金项目
国家自然科学基金(No.62405003,No.62201333) （No.62405003,No.62201333）
山西省基础研究计划(No.202203021222220)Supported by the National Natural Science Foundation of China(No.62405003,No.62201333) （No.202203021222220）
Basic Re-search Program of Shanxi Province(No.202203021222220) （No.202203021222220）
