Acta Optica Sinica, Volume. 38, Issue 2, 0206001(2018)
Few-Mode Fiber Temperature Sensor Based on Interference Between LP01 and LP11 Modes
A few-mode fiber (FMF) temperature sensor based on the interference between LP01 and LP11 modes is proposed. The sensor is fabricated with an FMF, of which one end is spliced to a lead-in single-mode fiber (SMF) with small lateral core-offsets and the other is spliced to a lead-out SMF with alignment. Firstly, the theoretical model of FMF is established with the scalar method and the characteristic equation of FMF is derived by the light field of continuous electromagnetic boundary condition. Through the numerical solution of the characteristic equation, the transmission mode of FMF is analyzed in detail. Then, the theoretical results are verified through the finite element analysis. Finally, the sensor is used for temperature sensing experiments. Through the Fourier transform of the transmission spectra at different temperatures, the two modes of interference are analyzed. According to the thermo optic effect, the temperature sensing model is established. The temperature sensitivity of the sensor is analyzed and calculated, which is consistent with the experimental results. The temperature measurement experiment is carried out with the proposed sensor, and the results show that when the temperature changes, the interference peak drifts, and the temperature sensitivity of a 16-mm-long sensor is 158.06 pm/℃ at 25.3-77.3 ℃. The temperature sensor can be widely used in industrial production, biomedical and other fields.
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Qiang Liu, Weihong Bi, Siwen Wang, Xin Lü, Xinghu Fu, Guangwei Fu. Few-Mode Fiber Temperature Sensor Based on Interference Between LP01 and LP11 Modes[J]. Acta Optica Sinica, 2018, 38(2): 0206001
Category: Fiber Optics and Optical Communications
Received: Apr. 20, 2017
Accepted: --
Published Online: Aug. 31, 2018
The Author Email: Bi Weihong (whbi@ysu.edu.cn)