Acta Optica Sinica, Vol. 40, Issue 24, 2406001 (2020)
Design and Analysis of Weakly-Coupled Eccentric-Core Few-Mode Fiber for Sensing Application
Zhang Jinyu1, Ren Fang1,2,*, Zhang Yiying1, Fan Xiaojie1, Hao Rui1, Niu Jingjing1, and Wang Jianping1,2
- 1School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China
- 2Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services, Beijing 100083, China
In this paper, by virtue of a finite element method, we studied the mode field characteristics, evanescent field characteristics, and bending loss of a weakly-coupled eccentric-core few-mode fiber in higher-order modes. Furthermore, we investigated the influence of fiber parameters on the minimum effective refractive index difference between adjacent modes, and optimized the fiber to support 10 linearly polarized modes and satisfy the weak coupling condition. In addition, we analyzed the power distribution and bending loss of the 10 modes at the wavelength of 1550 nm. The research results indicate that the minimum effective refractive index difference between adjacent modes is larger than 10 -4 over the whole C-band. Besides, the fiber shows higher evanescent field intensity, higher sensing sensitivity and larger bending loss in higher-order modes and can distinguish a specific bending direction. In conclusion, these results have potential application value for improving the sensitivity of sensors.
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