All-fiber temperature sensor based on few mode fiber and single-mode fiber

作者：Chen, Daru^*; Jiang, Xiaogang

来源：Microwave and Optical Technology Letters, 2013, 55(7): 1700-1703.

DOI：10.1002/mop.27657

• temperature sensor
• few mode fiber
• modal interference

We propose and demonstrate a novel all-fiber temperature sensor that is a single-end fiber modal interferometer (FMI) based on a segment of a few mode fiber (FMF) and a segment of a single-mode fiber (SMF).The FMF spliced to a lead-in SMF is used to expend the optical beam in the fiber and the sensing SMF with a well-cleaved end is spliced to the FMF. Owing to the core mismatch between the FMF and the sensing SMF, part of the guided light propagates in the cladding of the sensing SMF and part of the guided light propagates in the core of the sensing SMF, which finally forms the FMI when the reflective light comes back to the FMF. Temperature sensing is achieved by measuring the wavelength shift of the FMI. A temperature sensor with an average sensitivity of 0.1 nm/degrees C in a temperature range from 33 to 833 degrees C is presented.

• 出版日期2013-7
• 单位浙江大学; 浙江师范大学