[1] [1] X. Bao, D. P. Zhou, C. Baker, and L. Chen, “Recent development in the distributed fiber optic acoustic and ultrasonic detection,” Journal of Lightwave Technology, 2017, 35(16): 3256-3267.

[2] [2] Z. Y. Li, M. Y. Liu, Y. M. Wang, Q. Liu, and J. M. Gong, “Delay calibration method for wavelength-swept laser-based FBG demodulation system,” IEEE Photonics Technology Letters, 2014, 26(20): 2090-2092.

[3] [3] Z. H. Luo, H. Q. Wen, H. Y. Guo, and M. H. Yang, “A time- and wavelength-division multiplexing sensor network with ultra-weak fiber Bragg gratings,” Optics Express, 2913, 21(19): 22799-22807.

[4] [4] Z. Y. Li, Z. Q. Xu, Z. H. Tang, M. Zhao, L. J. Cai, and Q. Liu, “Research of high-speed FBG demodulation system for distributed dynamic monitoring of mechanical equipment,” Advances in Mechanical Engineering, 2013, 7: 679-681.

[5] [5] X. B. Hong, H. X. Guo, and J. Wu, “A Brillouin optical time domain analysis based distributed fiber optic intrusion sensor system,” Chinese Journal of Lasers, 2010, 37(37): 1037-1041.

[6] [6] Y. L. Lu, T. Zhu, L. Chen, and X. Y. Bao, “Distributed vibration sensor based on coherent detection of phase-OTDR,” Journal of Lightwave Technology, 2010, 28(22): 3243-3249.

[7] [7] A. Gunday and S. E. Karlik, “Optical fiber distributed sensing of temperature, thermal strain and thermo-mechanical force formations on OPGW cables under wind effects,” in Proceeding of International Conference on Electrical and Electronics Engineering, Bursa, Turkey, 2013, pp. 14-15.

[8] [8] Y. N. Wang and Z. D. Jiang, “Application of Golay codes to distributed optical fiber sensor for long-distance oil pipeline leakage and external damage detection,” Chinese Optics Letters, 2006, 4(3): 141-144.

[9] [9] C. Y. Ma, T. G. Liu, K. Liu, J. F. Jing, Z. Y. Ding, L. Pan, et al., “Long-range distributed fiber vibration sensor using an asymmetric dual Mach-Zehnder interferometers,” Journal of Lightwave Technology, 2016, 34(9): 2235-2239.

[10] [10] C. X. Zhang, Q. Li, S. Liang, W. T. Lin, L. J. Li, and X. Zhang, “Location algorithm for multi-disturbances in fiber-optic distributed disturbance sensor using a Mach-Zehnder interferometer,” in Proceeding of the 9th International Conference on Optical Communications and Networks, Nanjing, China, 2010, pp. 103-107.

[11] [11] J. C. Juarez and H. F. Taylor, “Distributed fiber optic intrusion sensor system,” Journal of Lightwave Technology, 2015, 23(6): 2081-2087.

[12] [12] Y. Koyamada, M. Imahama, K. Kubota, and K. Hogari, “Fiber-optic distributed strain and temperature sensing with very high measurand resolution over long range using coherent OTDR,” Journal of Lightwave Technology, 2009, 27(9): 1142-1146.

[13] [13] A. Masoudi, M. Belal, and T. P. Newson, “A distributed optical fiber dynamic strain sensor based on phase-OTDR,” Measurement Science & Technology, 2013, 24(8): 085204.

[14] [14] T. Zhu, Q. He, X. H. Xiao, and X. Y. Bao, “Modulated pulses based distributed vibration sensing with high frequency response and spatial resolution,” Optics Express, 2013, 21(3): 2953.

[15] [15] Q. He, T. Zhu, X. H. Xiao, B. M. Zhang, D. M. Diao, and X. Y. Bao, “All fiber distributed vibration sensing using modulated time-difference pulses,” IEEE Photonics Technology Letters, 2013, 25(20): 1955-1957.

[16] [16] C. Wang, Y. Shang, X. H. Liu, C. Wang, H. H. Yu, D. S. Jia, et al., “Distributed OTDR-interferometric sensing network with identical ultra-weak fiber Bragg gratings,” Optics Express, 2015, 23(22): 29038-29046.

[17] [17] C. B. Cameron, R. M. Keolian, and S. L. Garrett, “A symmetric analogue demodulator for optical fiber interferometric sensors,” in Proceeding of IEEE Symposium on Circuits and Systems, Monterey, CA, USA, 1991, pp. 666-671.

[18] [18] Z. F. Wang, H. Luo, and Y. M. Hu, “Signal detection technique for fiber-optic interferometric sensors,” Journal of Applied Optics, 2007, 28(1): 86-91.

[19] [19] F. Zhu, Y. X. Zhang, L. Xia, X. L. Wu, and X. P. Zhang, “Improved Φ-OTDR sensing system for high-precision dynamic strain measurement based on ultra-weak fiber Bragg grating array,” Journal of Lightwave Technology, 2015, 33(23): 4775-4780.