[1] D. J. Feng, G. X. Liu, X. L. Liu, M. S. Jiang, and Q. M. Sui, “Refractive index sensor based on plastic optical fiber with tapered structure,” Applied Optics, 2014, 53(10): 2007– 2011.

[2] J. Zhao, S. Q. Cao, C. R. Liao, Y. Wang, G. J. Wang, X. Z. Xu, et al., “Surface plasmon resonance refractive sensor based on silver-coated side-polished fiber,” Sensors and Actuators B: Chemical, 2016, 230: 206–211.

[3] S. Singh, S. K. Mishra, and B. D. Gupta, “Sensitivity enhancement of a surface plasmon resonance based fibre optic refractive index sensor utilizing an additional layer of oxides,” Sensors and Actuators A: Physical, 2013, 193: 136–140.

[4] G. Tsigaridas, D. Polyzos, A. Ioannou, M. Fakis, and P. Persephonis, “Theoretical and experimental study of refractive index sensors based on etched fiber Bragg gratings,” Sensors and Actuators A: Physical, 2014, 209: 9–15.

[5] Y. Ran, L. Jin, L. P. Sun, J. Li, and B. O. Guan, “Temperature-compensated refractive-index sensing using a single Bragg grating in an abrupt fiber taper,” IEEE Photonics Journal, 2013, 5(2): 7100208–7100208.

[6] B. Q. Jiang, X. Lu, X. T. Gan, M. Qi, Y. D. Wang, L. Han, et al., “Graphene-coated tilted fiber-Bragg grating for enhanced sensing in low-refractive-index region,” Optics Letters, 2015, 40(17): 3994–3997.

[7] A. Singh, “Long period fiber grating based refractive index sensor with enhanced sensitivity using Michelson interferometric arrangement,” Photonic Sensors, 2015, 5(2): 172–179.

[8] L. Coelho, D. Viegas, J. L. Santos, and J. M. M. M. de Almeida, “Enhanced refractive index sensing characteristics of optical fibre long period grating coated with titanium dioxide thin films,” Sensors and Actuators B: Chemical, 2014, 202: 929–934.

[9] Y. Li, Z. B. Liu, and S. S. Jian, “Multimode interference refractive index sensor based on coreless fiber,” Photonic Sensors, 2014, 4(1): 21–27.

[10] Y. Li, E. Harris, L. Chen, and X. Y. Bao, “Application of spectrum differential integration method in an in-line fiber Mach-Zehnder refractive index sensor,” Optics Express, 2010, 18(8): 8135–8143.

[11] R. Gao, Y. Jiang, W. H. Ding, Z. Wang, and D. Liu, “Filmed extrinsic Fabry-Perot interferometric sensors for the measurement of arbitrary refractive index of liquid,” Sensors and Actuators B: Chemical, 2013, 177: 924–928.

[12] C. L. Lee, J. M. Hsu, J. S. Horng, W. Y. Sung, and C. M. Li, “Microcavity fiber Fabry-Pérot interferometer with an embedded golden thin film,” IEEE Photonics Technology Letters, 2013, 25(9): 833–836.

[13] Z. L. Ran, Y. J. Rao, W. J. Liu, X. Liao, and K. S. Chiang, “Laser-micromachined Fabry-Perot optical fiber tip sensor for high-resolution temperature-independent measurement of refractive index,” Optics Express, 2008, 16(3): 2252–2263.

[14] Y. Gong, Y. Guo, Y. J. Rao, T. Zhao, and Y. Wu, “Fiber-optic Fabry-Perot sensor based on periodic focusing effect of graded-index multimode fibers,” IEEE Photonics Technology Letters, 2010, 22(23): 1708–1710.

[15] D. Wu, Y. Huang, J. Y. Fu, and G. Y. Wang, “Fiber Fabry-Perot tip sensor based on multimode photonic crystal fiber,” Optics Communications, 2015, 338: 288–291.

[16] D. Wu, W. Huang, G. Y. Wang, J. Y. Fu, and Y. Y. Chen, “In-line fiber Fabry-Perot refractive index tip sensor based on photonic crystal fiber and spectrum differential integration method,” Optics Communications, 2014, 313: 270–275.

[17] B. Qi, G. R. Pickrell, J. C. Xu, P. Zhang, Y. H. Duan, W. Peng, et al., “Novel data processing techniques for dispersive white light interferometer,” Optical Engineering, 2003, 42(11): 3165–3171.

[18] Y. Jiang, “High-resolution interrogation technique for fiber optic extrinsic Fabry-Perot interferometric sensors by the peak-to-peak method,” Applied Optics, 2008, 47(7): 925–932.

[19] C. J. Qi, M. H. Yang, D. W. Lee, W. J. Xie, and J. X. Dai, “Improved sensitivity of fiber Fabry-Perot interferometer based on phase-tracking algorithm,” IEEE Sensors Journal, 2015, 15(10): 5834–5838.

[20] X. H. Liu, M. S. Jiang, Q. M. Sui, and F. R. Song, “Temperature sensitivity characteristics of HCPCF-based Fabry-Perot interferometer,” Optics Communications, 2016, 359: 322– 328.

[21] M. S. Jiang, Q. M. Sui, Z. W. Jin, F. Y. Zhang, and L. Jia, “Temperature-independent optical fiber Fabry-Perot refractive-index sensor based on hollow-core photonic crystal fiber,” Optik – International Journal for Light and Electorn Optics, 2014, 125(13): 3295– 3298.

[22] A. Savitzky and M. J. E. Golay, “Smoothing and differentiation of data by simplified least squares procedures,” Analytical Chemistry, 1964, 36(8): 1627–1639.