[1] Liang W, Huang Y Y, Xu Y, et al. Highly sensitive fiber Bragg grating refractive index sensors［J］. Applied Physics Letters, 2005, 86(15): 151122.

[2] Li J, Wang H, Sun L P, et al. Etching Bragg gratings in Panda fibers for the temperature-independent refractive index sensing［J］. Optics Express, 2014, 22(26): 31917-31923.

[3] Chong J H, Shum P,Haryono H, et al. Measurements of refractive index sensitivity using long-period grating refractometer［J］. Optics Communications, 2004, 229(1): 65-69.

[4] Fan P C, Sun L P, Yu Z P, et al. Higher-order diffraction of long-period microfiber gratings realized by arc discharge method［J］. Optics Express, 2016, 24(22): 25380-25388.

[5] Cai Z Y, Liu F, Guo T, et al. Evanescently coupled optical fiber refractometer based a tilted fiber Bragg grating and a D-shaped fiber［J］. Optics Express, 2015, 23(16): 20971-20976.

[6] 黄梦, 顾昌晟, 孙兵, 等. 基于石墨烯涂覆倾斜光纤光栅的折射率传感［J］. 中国激光, 2017, 44(12): 1210001.

    Huang M, Gu C S, Sun B, et al. Refractive index sensor based on tilted-fiber Bragg grating coated with graphene［J］. Chinese Journal of Lasers, 2017, 44(12): 1210001.

[7] Ji W B, Liu H H, Tjin S C, et al. Ultrahigh sensitivity refractive index sensor based on optical microfiber［J］. IEEE Photonics Technology Letters, 2012, 24(20): 1872-1874.

[8] Wo J H, Wang G H, Cui Y, et al. Refractive index sensor using microfiber-based Mach-Zehnder interferometer［J］. Optics Letters, 2012, 37(1): 67-69.

[9] Tian Z B, Yam S H, Loock H P. Single-mode fiber refractive index sensor based on core-offset attenuators［J］. IEEE Photonics Technology Letters, 2008, 20(16): 1387-1389.

[10] 王旗, 邹辉, 韦玮. 基于偏芯熔接光纤的应力与折射率传感器［J］. 光学学报, 2017, 37(10): 1006005.

    Wang Q, Zou H, Wei W. Strain and refractive index sensor based on core offset splicing fibers［J］. Acta Optica Sinica, 2017, 37(10): 1006005.

[11] Shao M, Qiao X G, Fu H W, et al. Refractive index sensing of SMS fiber structure based Mach-Zehnder interferometer［J］. IEEE Photonics Technology Letters, 2014, 26(5): 437-439.

[12] 曹晔, 刘文, 赵舜, 等. 基于光子晶体光纤和单模光纤错芯结构的光纤传感器［J］. 光电子·激光, 2015, 26(7): 1233-1237.

    Cao Y, Liu W, Zhao S, et al. A fiber sensor based on the core-offset structure of PCF to SMF［J］. Journal of Optoelectronics·Laser, 2015, 26(7): 1233-1237.

[13] Zhao Y, Li X G, Cai L. A highly sensitive Mach-Zehnder interferometric refractive index sensor based on core-offset single mode fiber［J］. Sensors and Actuators A: Physical, 2015, 223: 119-124.

[14] Gao S C, Zhang W G, Zhang H, et al. Reconfigurable and ultra-sensitive in-line Mach-Zehnder interferometer based on the fusion of microfiber and microfluid［J］. Applied Physics Letters, 2015, 106(8): 084103.

[15] Wang Y, Yang M W, Wang D N, et al. Fiber in-line Mach-Zehnder interferometer fabricated by femtosecond laser micromachining for refractive index measurement with high sensitivity［J］. Journal of the Optical Society of America B, 2010, 27(3): 370-374.

[16] Duan D W, Rao Y J, Xu L C, et al. In-fiber Mach-Zehnder interferometer formed by large lateral offset fusion splicing for gases refractive index measurement with high sensitivity［J］. Sensors and Actuators B: Chemical, 2011, 160(1): 1198-1202.

[17] Baharin N F, Azmi A I, Abdullah A S, et al. Refractive index sensor based on lateral-offset of coreless silica interferometer［J］. Optics and Laser Technology, 2018, 99: 396-401.

[18] 杨珅, 荣强周, 孙浩, 等. 基于Michelson干涉仪的高灵敏度光纤高温探针传感器［J］. 物理学报, 2013, 62(8): 084218.

    Yang S, Rong Q Z, Sun H, et al. High temperature probe sensor with high sensitivity based on Michelson interferometer［J］. Acta Physica Sinica, 2013, 62(8): 084218.

[19] Dong B, Hao E J. Temperature-insensitive and intensity-modulated embedded photonic-crystal-fiber modal-interferometer-based microdisplacement sensor［J］. Journal of the Optical Society of America B, 2011, 28(10): 2332-2336.

[20] 白泽生, 刘竹琴, 徐红. 几种液体的折射率与其浓度关系的经验公式［J］. 延安大学学报（自然科学版）, 2004, 23(1): 33-34.

    Bai Z S, Liu Z Q, Xu H. An experienced formula about the connection of refraction index and consistence of several liquid［J］. Journal of Yanan University (Natural Science Edition), 2004, 23(1): 33-34.

[21] Yao Q Q, Meng H Y, Wang W, et al. Simultaneous measurement of refractive index and temperature based on a core-offset Mach-Zehnder interferometer combined with a fiber Bragg grating［J］. Sensors and Actuators A: Physical, 2014, 209(1): 73-77.

[22] Fan J L, Zhang J S, Lu P, et al. A single-mode fiber sensor based on core-offset inter-modal interferometer［J］. Optics Communications, 2014, 320: 33-37.