[1] [1] Chen Song, Yang Xiufeng, Tong Zhengrong, et al. Experimental research on sensor for simultaneous measurement of dual parameters based on interference of higher order modes［J］. Journal of Tianjin University of Technology, 2012, 28(3): 34-37.

[2] [2] Li An, Wang Yifei, Hu Qian, et al. Few-mode fiber based optical sensors［J］. Optics Express, 2015, 23(2): 1139.

[3] [3] Li An, Wang Yifei, Fang Jian, et al. Few-mode fiber multi-parameter sensor with distributed temperature and strain discrimination［J］. Optics Letters, 2015, 40(7): 1488-1491.

[4] [4] Xu Yanping. Multi-parameter sensing based on in-line Mach-Zehnder interferometer［D］. Ottawa: University of Ottawa, 2013.

[5] [5] Li Jie.The speciality of D-type few-mode fiber Bragg grating and its applications in the refractive index measurement［D］. Xiamen: Xiamen University, 2006.

[6] [6] Fukano H, Aiga T, Taue S. High-sensitivity fiber-optic refractive index sensor based on multimode interference using small-core single-mode fiber for biosensing［J］. Japanese Journal of Applied Physics, 2014, 53(4S): 853-871.

[7] [7] Liu Feng, Zhang Xiaofei, Lu Xin. Research on modular interference characteristics of elliptical-core polarization maintenance optic fiber［J］. Journal of Yanshan University, 2012, 36(2): 161-164.

[8] [8] Safaai-Jazi A, Mckeeman J. Synthesis of intensity patterns in few-mode optical fibers［J］. Journal of Lightwave Technology, 1991, 9(9): 1047-1052.

[9] [9] Wang Helin, Bi Weihong, Yang Aijun, et al. Design of all-fiber voltage sensor based on intermode interference［J］. Power System Technology, 1900, 30(24): 50-55.

[10] [10] Kumar A, Jindal R, Varshney R K, et al. A fiber-optic temperature sensor based on LP01-LP02 mode interference［J］. Optical Fiber Technology, 2000, 6(1): 83-90.

[11] [11] Kumar A, Goel N K, Varshney R K. Fiber optic strain sensor based on LP01-LP02 mode interference in a few mode optical fiber［C］. SPIE, 2001, 4417: 500-505.

[12] [12] Wei Chunfen. Study of filter and temperature sensor based on the few mode fiber［D］. Xiamen: Xiamen University, 2013.

[13] [13] Wei Peng. Research on fabrication method and sensing characteristics of few-mode fiber Bragg grating［D］. Qingdao: Shandong University of Science and Technology, 2009.

[14] [14] Xie Yiwei, Fu Songnian, Zhang Minming, et al. Mode selective excitation techniques for few-mode fibers［J］. Study of Optical Communication, 2013, 39(3): 1-3.