[1] [1] K. T. V. Grattan and T. Sun, Sensors and Actuators A: Physical 82, 40 (2000).

[2] [2] T. Zhu, D. Wu, M. Liu and D. W. Duan, Sensors 12, 10430 (2012).

[3] [3] A. D. Kersey, M. A. Davis, H. J. Patrick, M. LeBlanc, K. P. Koo, C. G. Askins, M. A. Putnam and E. J. Friebele, Journal of Lightwave Technology 15, 1442 (1997).

[4] [4] G. H. Xiang, M. L. Hu, X. G. Qiao, Q. Z. Rong, Y. Ma, Q. F. Xu and L. Liang, Journal of Optoelectronics·Laser 23, 41 (2012). (in Chinese)

[5] [5] X. C. Ma, Z. A. Zhou, A. C. Liu and X. Y. Wang, Journal of Optoelectronics·Laser 24, 1245 (2013). (in Chinese)

[6] [6] J. Mandal, S. Pal, T. Sun, K. T. V. Grattan, A. T. Augousti and S. A. Wade, IEEE Photonics Technology Letters 16, 218 (2004).

[7] [7] K. Iwatsuki, H. Okamura and M. Saruwatari, Electronics Letters 26, 2033 (1990).

[8] [8] A. C. L. Wong, D. Chen, H. J. Wang, W. H. Chung, H. Y. Tam, C. Lu and B. O. Guan, Measurement Science & Technology 22, 045202 (2011).

[9] [9] S. A. Babin, D. V. Churkin, A. E. Ismagulov, S. I. Kablukov and M. A. Nikulin, Laser Physics Letters 4, 428 (2007).

[10] [10] M. Horowitz, R. Daisy, B. Fischer and J. Zyskind, Electronics Letters 30, 648 (1994).

[11] [11] Z. Meng, G. Stewart and G. Whitenett, Journal of Light Technology 24, 2179 (2006).

[12] [12] C. I. Aguirre, E. Reguera and A. Stein, Advanced Functional Materials 20, 2565 (2010).

[13] [13] X. Cao, X. Y. Li, J. H. Jiang and Y. L. Yu, Optical Communication Technology 33, 15 (2009). (in Chinese)

[14] [14] B. Wu, Y. Z. Liu and S. Liu, Opto-Electronic Engineering 34, 30 (2007). (in Chinese)

[15] [15] N. Kishi and T. Yazaki, IEEE Photonics Technology Letters 11, 182 (1999).

[16] [16] S. W. Harun, K. S. Lim, A. A. Jasim and H. Ahmad, Journal of Modern Optics 57, 2111 (2010).

[17] [17] H. Yan, M. Wang, Y. Ge and P. Yu, Optical Fiber Technology 15, 324 (2009).

[18] [18] J. Chen, J. Zhou, Q. Zhang, H. Zhang and M. Y. Chen, IEEE Sensors Journal 13, 2780 (2013).