Research and Analysis of Brillouin distributed Sensing System based on Quasi-single-mode few-mode Fiber

Abstract:

A distributed fiber sensor was created by splicing two SMFs using the FMF technique. A BOTDA system was developed to measure the sensor's temperature and bending performance. Two-mode and four-mode step FMFs were combined to splice the few-mode segment. The results indicate that the temperature response coefficients of the few-mode segment are only slightly higher than those of the connected single-mode segment, measuring at 1.13MHz/℃ and 1.12 MHz/℃, respectively. The minimum bending radius for the sensor is 0.9cm, and the four-mode bending response curve is superior to that of the two-mode, proving that 4-SI-FMF offers better-bending sensitivity.

Key words:FMF;BOTDA;temperature respons;bending sensitivitye;