[1] Mumtaz F, Dai Y T, Ashraf M A. Inter-cross de-modulated refractive index and temperature sensor by an etched multi-core fiber of a MZI structure[J]. Journal of Lightwave Technology, 38, 6948-6953(2020).

[2] Zhan X, Liu Y P, Tang M et al. Few-mode multicore fiber enabled integrated Mach-Zehnder interferometers for temperature and strain discrimination[J]. Optics Express, 26, 15332-15342(2018).

[3] Yan D, Chen N G, Tian Z et al. Temperature sensor based on multicore fiber supermode interference[J]. Laser & Optoelectronics Progress, 58, 0706007(2021).

[4] Zhang C X, Pang F F, Liu H H et al. Highly efficient excitation of LP01 mode in ring-core fibers by tapering for optimizing OAM generation[J]. Chinese Optics Letters, 18, 020602(2020).

[5] Goncharenko I A, Marsin’yak M, Konoiko A I et al. Optimization of the structure of an optical vectoral bend and stress sensor based on a three-core microstructured fiber[J]. Measurement Techniques, 56, 65-71(2013).

[6] Lorenzi R, Jung Y, Brambilla G. In-line absorption sensor based on coiled optical microfiber[J]. Applied Physics Letters, 98, 173504(2011).

[7] Zhou Y, Wang Y, Liu H B et al. High-sensitive bending sensor based on a seven-core fiber[J]. Optics Communications, 483, 126617(2021).

[8] Zhu X L, Yuan L B, Liu Z H et al. Coupling theoretical model between single-core fiber and twin-core fiber[J]. Journal of Lightwave Technology, 27, 5235-5239(2009).

[9] Birks T A, Li Y W. The shape of fiber tapers[J]. Journal of Lightwave Technology, 10, 432-438(1992).

[10] Heiblum M, Harris J. Analysis of curved optical waveguides by conformal transformation[J]. IEEE Journal of Quantum Electronics, 11, 75-83(1975).