[1] Bai Z Y, Zhang W G, Gao S C et al. Compact long period fiber grating based on periodic micro-core-offset[J]. IEEE Photonics Technology Letters, 25, 2111-2114(2013).

[2] Andre R M, Biazoli C R, Silva S O et al. Strain-temperature discrimination using multimode interference in tapered fiber[J]. IEEE Photonics Technology Letters, 25, 155-158(2013).

[3] Frazão O, Martynkien T, Baptista J M et al. Optical refractometer based on a birefringent Bragg grating written in an H-shaped fiber[J]. Optics Letters, 34, 76-78(2008).

[4] Ni X J, Huang M. Faraday effect optical current/magnetic field sensors based on cerium-substituted yttrium iron garnet single crystal[C]. //2010 Asia-Pacific Power and Energy Engineering Conference, March 28-31, 2010, Chengdu, China., 1-4(2010).

[5] Cheng L H, Han J L, Guo Z Z et al. A novel miniature magnetic field sensor based on Faraday effect using a heterodyning fiber grating laser[C]. //2012 Photonics Global Conference (PGC), December 13-16, 2012, Singapore., 1-4(2012).

[6] Baudendistel T A, Turner M L. A novel inverse-magnetostrictive force sensor[J]. IEEE Sensors Journal, 7, 245-250(2007).

[7] Chieh J J, Yang S Y, Chao Y H et al. Dynamic response of optical-fiber modulator by using magnetic fluid as a cladding layer[J]. Journal of Applied Physics, 97, 043104(2005).

[8] Deng H D, Liu J, Zhao W R et al. Enhancement of switching speed by laser-induced clustering of nanoparticles in magnetic fluids[J]. Applied Physics Letters, 92, 233103(2008).

[9] Liu T, Chen X, Di Z et al. Tunable magneto-optical wavelength filter of long-period fiber grating with magnetic fluids[J]. Applied Physics Letters, 91, 121116(2007).

[10] Miao Y P, Zhang H, Lin J C et al. Simultaneous measurement of temperature and magnetic field based on a long period grating concatenated with multimode fiber[J]. Applied Physics Letters, 106, 132410(2015).

[11] Zhang Z C, Guo T, Zhang X J et al. Plasmonic fiber-optic vector magnetometer[J]. Applied Physics Letters, 108, 101105(2016).

[12] Shi J M, Zheng D, Pan W et al. Fiber grating ultrasonic sensor based on coupling cone structure and its application in nondestructive detection[J]. Acta Optica Sinica, 39, 1206004(2019).

[13] Gao R, Jiang Y, Abdelaziz S. All-fiber magnetic field sensors based on magnetic fluid-filled photonic crystal fibers[J]. Optics Letters, 38, 1539-1541(2013).

[14] Wang C C, Fan R H, Wu G Z et al. Characteristics of all-optical-fiber magnetic field sensor based on magnetic fluid coating and cooling tapering[J]. Laser & Optoelectronics Progress, 57, 010602(2020).

[15] Zhang N M Y, Dong X Y, Shum P P et al. Magnetic field sensor based on magnetic-fluid-coated long-period fiber grating[J]. Journal of Optics, 17, 065402(2015).

[16] Chen Y F, Han Q, Liu T G et al. Optical fiber magnetic field sensor based on single-mode-multimode-single-mode structure and magnetic fluid[J]. Optics Letters, 38, 3999-4001(2013).

[17] Zhao Y, Wu D, Lv R Q et al. Magnetic field measurement based on the Sagnac interferometer with a ferrofluid-filled high-birefringence photonic crystal fiber[J]. IEEE Transactions on Instrumentation and Measurement, 65, 1503-1507(2016).

[18] Li X L, Ding H. All-fiber magnetic-field sensor based on microfiber knot resonator and magnetic fluid[J]. Optics Letters, 37, 5187-5189(2012).

[19] El Amili A, Souza M C M M, Vallini F et al. Magnetically controllable silicon microring with ferrofluid cladding[J]. Optics Letters, 41, 5576-5579(2016).

[20] Chen Y F, Han Q, Yan W C et al. Magnetic-fluid-coated photonic crystal fiber and FBG for magnetic field and temperature sensing[J]. IEEE Photonics Technology Letters, 28, 2665-2668(2016).

[21] Miao Y P, Wu J X, Lin W et al. Magnetic field tunability of optical microfiber taper integrated with ferrofluid[J]. Optics Express, 21, 29914-29920(2013).

[22] Wang H T, Pu S L, Wang N et al. Magnetic field sensing based on singlemode-multimode-singlemode fiber structures using magnetic fluids as cladding[J]. Optics Letters, 38, 3765-3768(2013).

[23] Luo L F, Pu S L, Tang J L et al. Highly sensitive magnetic field sensor based on microfiber coupler with magnetic fluid[J]. Applied Physics Letters, 106, 193507(2015).

[24] Pu S L, Mao L M, Yao T J et al. Microfiber coupling structures for magnetic field sensing with enhanced sensitivity[J]. IEEE Sensors Journal, 17, 5857-5861(2017).

[25] Layeghi A, Latifi H. Tunable ferrofluid magnetic fiber sensor based on nonadibatic tapered hi-Bi fiber in fiber loop mirror[J]. Journal of Lightwave Technology, 36, 1097-1104(2018).

[26] Chen H, Shao Z H, Zhang X et al. Highly sensitive magnetic field sensor using tapered Mach-Zehnder interferometer[J]. Optics and Lasers in Engineering, 107, 78-82(2018).

[27] Zhang R, Pu S L, Li Y Q et al. Mach-Zehnder interferometer cascaded with FBG for simultaneous measurement of magnetic field and temperature[J]. IEEE Sensors Journal, 19, 4079-4083(2019).

[28] Wang J, Pei L, Wang J S et al. Magnetic field and temperature dual-parameter sensor based on magnetic fluid materials filled photonic crystal fiber[J]. Optics Express, 28, 1456-1471(2020).

[29] Li P F, Yan H T, Xie Z W et al. An intensity-modulated and large bandwidth magnetic field sensor based on a tapered fiber Bragg grating[J]. Optics & Laser Technology, 125, 105996(2020).

[30] Wang L Z, Li L J, Tong L M. Optical microfibers and their applications in mode-locked fiber lasers[J]. Acta Optica Sinica, 39, 0126011(2019).

[31] Hong C Y, Horng H E, Yang S Y. Tunable refractive index of magnetic fluids and its applications[J]. Physica Status Solidi (c), 1, 1604-1609(2004).

[32] Lacroix S, Gonthier F, Black R J et al. Tapered-fiber interferometric wavelength response: the achromatic fringe[J]. Optics Letters, 13, 395-397(1988).

[33] Cassidy D T, Johnson D C, Hill K O. Wavelength-dependent transmission of monomode optical fiber tapers[J]. Applied Optics, 24, 945-950(1985).