[1] Huang W Z, Zhang W T, Huang J T et al. Demonstration of multi-channel fiber optic interrogator based on time-division locking technique in subway intrusion detection[J]. Optics Express, 28, 11472-11481(2020).

[2] Huang X D, Wang B Y, Liu K et al. An event recognition scheme aiming to improve both accuracy and efficiency in optical fiber perimeter security system[J]. Journal of Lightwave Technology, 38, 5783-5790(2020).

[3] Liu S Q, Yu F H, Hong R et al. Advances in phase-sensitive optical time-domain reflectometry[J]. Opto-Electronic Advances, 5, 200078(2022).

[4] Jousset P, Currenti G, Schwarz B et al. Fibre optic distributed acoustic sensing of volcanic events[J]. Nature Communications, 13, 1753(2022).

[5] Bado M F, Casas J R. A review of recent distributed optical fiber sensors applications for civil engineering structural health monitoring[J]. Sensors, 21, 1818(2021).

[6] Liu K, Jin X B, Jiang J F et al. Interferometer-based distributed optical fiber sensors in long-distance vibration detection: a review[J]. IEEE Sensors Journal, 22, 21428-21444(2022).

[7] Li Y, Wang Y, Xiao L et al. Phase demodulation methods for optical fiber vibration sensing system: a review[J]. IEEE Sensors Journal, 22, 1842-1866(2022).

[8] Zhang Q, Zhu T, Hou Y S et al. All-fiber vibration sensor based on a Fabry-Perot interferometer and a microstructure beam[J]. Journal of the Optical Society of America B, 30, 1211-1215(2013).

[9] Li T L, Guo J X, Tan Y G et al. Recent advances and tendency in fiber Bragg grating-based vibration sensor: a review[J]. IEEE Sensors Journal, 20, 12074-12087(2020).

[10] Al-Ashwal N H, Al Soufy K A M, Hamza M E et al. Deep learning for optical sensor applications: a review[J]. Sensors, 23, 6486(2023).

[11] Fang N, Wang S, Wang C H. Distributed optical fiber vibration sensing implemented with delayed feedback reservoir computing[J]. Optics & Laser Technology, 162, 109244(2023).

[12] Zhu C Y, Yang K X, Yang Q M et al. A comprehensive bibliometric analysis of signal processing and pattern recognition based on distributed optical fiber[J]. Measurement, 206, 112340(2023).

[13] Wang H L, Cha S, Kong H J et al. Output characteristics of high-power stimulated Brillouin scattering pulse compression enhanced by thermal effects based on HT270[J]. High Power Laser Science and Engineering, 10, e24(2022).

[14] Cui Y L, Tian X, Rao B Y et al. A 110 W fiber gas Raman laser at 1153 nm[J]. High Power Laser Science and Engineering, 11, e10(2023).

[15] Wang Y Y, Zheng H, Wu H et al. Coherent OTDR with large dynamic range based on double-sideband linear frequency modulation pulse[J]. Optics Express, 31, 17165-17174(2023).

[16] Si Z P, Bu Z H, Mao B N et al. Review of research on phase sensitive optical time-domain reflectometer based on phase demodulation[J]. Laser & Optoelectronics Progress, 59, 1100007(2022).

[17] Dang Y L, Zhao Z Y, Wang X F et al. Simultaneous distributed vibration and temperature sensing using multicore fiber[J]. IEEE Access, 7, 151818-151826(2019).

[18] Wu H T, Guo N, Zhong Z X et al. High-performance distributed dynamic strain sensing by synthesizing φ-OTDR and BOTDR[J]. Optics Express, 31, 18098-18108(2023).

[19] Xu Z G, Ling J M, Ye W et al. Spatial resolution optimization technology of Raman OTDR using variable sampling rate[J]. IEEE Sensors Journal, 23, 10500-10508(2023).

[20] Fu C L, Peng Z W, Li P F et al. Research on distributed fiber temperature/strain/shape sensing based on OFDR[J]. Laser & Optoelectronics Progress, 60, 1106007(2023).

[21] Lai X, Yu H D, Ma Y X et al. Disturbance location and pattern recognition of a distributed optical fiber sensor based on dual-Michelson interferometers[J]. Applied Optics, 61, 241-248(2021).

[22] Wang G D, Song Q H, Peng H K et al. Dual-wavelength Michelson interferometer employing time delay estimation for distributed disturbance location[J]. Optical Fiber Technology, 56, 102181(2020).

[23] Xue K, Liu K, Jiang J F et al. Optical fiber vibration sensing detection with high accuracy based on YOLOv5s model[J]. Acta Optica Sinica, 43, 0228001(2023).

[24] Huang J W, Chen Y C, Peng H K et al. A 150 km distributed fiber-optic disturbance location sensor with no relay based on the dual-Sagnac interferometer employing time delay estimation[J]. Optics Communications, 479, 126420(2021).

[25] Song Q H, Zhou P W, Peng H K et al. Improved localization algorithm for distributed fiber-optic sensor based on merged Michelson-Sagnac interferometer[J]. Optics Express, 28, 7207-7220(2020).

[26] Yuan W, Pang B, Bo J et al. Fiber optic line-based sensor employing time delay estimation for disturbance detection and location[J]. Journal of Lightwave Technology, 32, 1032-1037(2014).

[27] Pi S H, Wang B J, Jia B et al. Intrusion localization algorithm based on linear spectrum in distributed Sagnac optical fiber sensing system[J]. Optical Engineering, 54, 085105(2015).

[28] Ruan L, He C F, Wu B. Security monitoring system based on a line structure Sagnac interferometer with 3×3 coupler[J]. Optical Engineering, 55, 064108(2016).

[29] Wu H Y, Wang J, Jia B. Parametric modeling in distributed optical fiber vibration sensing system for position determination[J]. Optical Engineering, 55, 046104(2016).

[30] Ye Z, Wang J, Wang C et al. A positioning algorithm realized multilateration for distributed fiber-optic sensor[J]. Microwave and Optical Technology Letters, 58, 2913-2917(2016).

[31] Hughes R, Jarzynski J. Static pressure sensitivity amplification in interferometric fiber-optic hydrophones[J]. Applied Optics, 19, 98-107(1980).

[32] Giallorenzi T G, Bucaro J A, Dandridge A et al. Optical fiber sensor technology[J]. IEEE Journal of Quantum Electronics, 18, 626-665(1982).

[33] Wang X Z, Jiang J B, Li Y et al. Effect of shock on Sagnac fiber interferometer performance[J]. Chinese Journal of Lasers, 44, 0706003(2017).

[34] Fang Z J, Qin G G, Qu R H[M]. Fundamentals of optical fiber sensors(2014).

[35] Fang X J. Fiber-optic distributed sensing by a two-loop Sagnac interferometer[J]. Optics Letters, 21, 444-446(1996).

[36] Kersey A D, Marrone M J, Davis M A. Polarisation-insensitive fibre optic Michelson interferometer[J]. Electronics Letters, 27, 518-520(1991).

[37] Dandridge A, Tveten A, Giallorenzi T. Homodyne demodulation scheme for fiber optic sensors using phase generated carrier[J]. IEEE Journal of Quantum Electronics, 18, 1647-1653(1982).

[38] Ren Q Y, Li J H, Hong Y P et al. An arc tangent function demodulation method of fiber-optic Fabry-Perot high-temperature pressure sensor[J]. Photonic Sensors, 7, 211-216(2017).

[39] Moradi H, Hosseinibalam F, Hassanzadeh S. Simulation and experimental investigation about interferometric optical fiber acoustic sensor for sensitivity enhancement[J]. Measurement, 137, 556-561(2019).

[40] Huang S C, Lin W W, Tsai M T et al. Fiber optic in-line distributed sensor for detection and localization of the pipeline leaks[J]. Sensors and Actuators A: Physical, 135, 570-579(2007).

[41] Sheem S K. Optical fiber interferometers with [3×3] directional couplers: analysis[J]. Journal of Applied Physics, 52, 3865-3872(1981).

[42] Hu Y H, Chen Y C, Song Q H et al. An asymmetrical dual Sagnac distributed fiber sensor for high precision localization based on time delay estimation[J]. Journal of Lightwave Technology, 39, 6928-6933(2021).

[43] Kurmer J P, Kingsley S A, Laudo J S et al. Distributed fiber optic acoustic sensor for leak detection[J]. Proceedings of SPIE, 1586, 117-128(1992).

[44] Lu P, Lalam N, Badar M et al. Distributed optical fiber sensing: review and perspective[J]. Applied Physics Reviews, 6, 041302(2019).

[45] Ye Z, Li C R, Wang C. A multichannel optic fiber sensing system based on hybrid Sagnac structure[J]. Microwave and Optical Technology Letters, 61, 2651-2656(2019).

[46] Wang C, Tang H, Xiao Q et al. The application of wide spectrum laser in noncontact vibration measurement[J]. Microwave and Optical Technology Letters, 51, 2858-2861(2009).

[47] Jin R, Yuan Z Z, Wu Y J et al. Study on dual-wavelength wide-spectrum erbium-doped fiber ring laser for optical fiber interferometric sensing system[J]. Journal of Lightwave Technology, 41, 5796-5804(2023).

[48] Wang Y, Liu X, Jin B Q et al. Optical fiber vibration sensor using chaotic laser[J]. IEEE Photonics Technology Letters, 29, 1336-1339(2017).

[49] Li P H, Wang Y, Liu X et al. Sagnac vibration sensing system with nested pulse method[J]. Journal of Lightwave Technology, 39, 1550-1556(2021).

[50] Lai M C, Peng K, Luo Y Y et al. Ultra-long distance distributed intrusion detecting system assisted with in-line amplification[J]. IEEE Photonics Journal, 9, 6801810(2017).

[51] Ye Z, Li C R, Wang C. Ultra-long-distance (>160 km) distributed optic fiber vibration sensing system without an in-line repeater[J]. Applied Optics, 58, 3426-3431(2019).

[52] Shi Y F, Chen Y C, Song Q H et al. The impact of scattered light on the SNR of Bi-EDFA based distributed optical fiber sensor[J]. Journal of Fudan University (Natural Science), 60, 473-481(2021).

[53] Soto M A, Angulo-Vinuesa X, Martin-Lopez S et al. Extending the real remoteness of long-range Brillouin optical time-domain fiber analyzers[J]. Journal of Lightwave Technology, 32, 152-162(2014).

[54] Peng F, Wang Z N, Rao Y J et al. 106 km fully-distributed fiber-optic fence based on P-OTDR with 2nd-order Raman amplification[C], JW2A.22(2013).

[55] Peng F, Wu H, Jia X H et al. Ultra-long high-sensitivity Φ-OTDR for high spatial resolution intrusion detection of pipelines[J]. Optics Express, 22, 13804-13810(2014).

[56] Shen L M, Jia B, Xiao Q. Study on polarization dependence of fiber optic Raman amplifier in single-core feedback structure[J]. Journal of Fudan University (Natural Science), 62, 637-646(2023).

[57] Song Y C, Ma Y X, Lai X et al. Fiber optic sensor based on linear Sagnac interferometer for branch localization[J]. Journal of Lightwave Technology, 41, 6621-6630(2023).

[58] Xiao Q, Jia B, Wu Y et al. Characteristic phase generated carrier technology for the single-core fiber optic sensing[J]. Chinese Journal of Scientific Instrument, 35, 36-42(2014).

[59] Li C R, Yan Y Z, Wang C. Study on multi-time reflection induced by in-line fiber connector in engineering applied distributed single-fiber interferometer sensing system[J]. Microwave and Optical Technology Letters, 62, 3014-3022(2020).

[60] Zhen S L, Chen J, Li H et al. Low-coherence fiber differential interferometer with adjustable measurement range[J]. IEEE Photonics Technology Letters, 27, 895-898(2015).

[61] Zhao Z Q, Demokan M S, MacAlpine M. Improved demodulation scheme for fiber optic interferometers using an asymmetric 3 × 3 coupler[J]. Journal of Lightwave Technology, 15, 2059-2068(1997).

[62] Zhen S L, Chen J, Li H et al. Triple detection fiber differentiating interferometer based on low-coherence interferometer and its passive demodulation scheme[J]. Optics & Laser Technology, 73, 63-68(2015).

[63] Wu Y J, Li C R, Tang H et al. Improved differential phase detecting optical fiber interferometer with a low-frequency compensation scheme[J]. IEEE Access, 10, 15487-15494(2022).

[64] Li C R, Ye Z, Yan Y Z et al. Compensation method for signal drift induced by time delay difference in phase retrieval algorithm for distributed fiber interferometry using asymmetric 3×3 coupler[J]. Microwave and Optical Technology Letters, 62, 1134-1144(2020).

[65] Wu Y J, Li C R, Wang C et al. Self-calibration phase demodulation scheme for stabilization based on an auxiliary reference fiber-optic interferometer and ellipse fitting algorithm[J]. Optics Express, 31, 4639-4651(2023).

[66] Wang H, Sun Q Z, Li X L et al. Improved location algorithm for multiple intrusions in distributed Sagnac fiber sensing system[J]. Optics Express, 22, 7587-7597(2014).

[67] Wu J Y, Zhuo R S, Wan S P et al. Intrusion location technology of Sagnac distributed fiber optical sensing system based on deep learning[J]. IEEE Sensors Journal, 21, 13327-13334(2021).

[68] Xu H Y, Xu Q, Xiao Q et al. Disturbance detection in distributed fiber-optic sensor based on time-delay estimation[J]. Acta Optica Sinica, 30, 1603-1607(2010).

[69] Wang Y, Li P H, Zhang J G et al. Distributed optical fiber vibration sensor using generalized cross-correlation algorithm[J]. Measurement, 144, 58-66(2019).

[70] Pi S H, Wang B J, Zhao D et al. Multi-resolution intrusion localization algorithm through cepstrum in distributed fiber optic Sagnac interferometer[J]. Acta Physica Sinica, 65, 044210(2016).

[71] Pi S H, Wang B J, Zhao J et al. High-spatial-resolution localization algorithm based on cascade deconvolution in a distributed Sagnac interferometer invasion monitoring system[J]. Applied Optics, 55, 8180-8184(2016).

[72] Mi Q S, Yu H D, Xiao Q. A self-tracking phase retrieval algorithm used in distributed disturbance sensing[J]. Microwave and Optical Technology Letters, 63, 1382-1388(2021).

[73] Huang J W, Chen Y C, Xiao Q et al. A novel Sagnac distributed optical fiber vibration sensor based on time delay estimation algorithm[J]. Proceedings of SPIE, 11607, 1160705(2021).

[74] Wang Y C, Gong L S, Jin B Q et al. Distributed optical fiber sensor using Sagnac for acoustic detection[J]. Journal of Measurement Science and Instrumentation, 8, 84-88(2017).

[75] He L, Feng X, Wu H M et al. Research on acoustic sensor based on linear optical fiber Sagnac interferometer and its de-noising method[J]. Chinese Journal of Scientific Instrument, 40, 70-77(2019).

[76] Xiong X Z, Wan S P, Liu H et al. Research on linear Sagnac optic fiber speech sensor and noise reduction[J]. Laser & Optoelectronics Progress, 58, 1106002(2021).

[77] Fang N, Wang L T, Jia D J et al. Walking intrusion signal recognition method based on gait characteristic for fiber fence system[J]. Microwave and Optical Technology Letters, 52, 2381-2384(2010).

[78] Wang B J, Pi S H, Sun Q et al. Improved wavelet packet classification algorithm for vibrational intrusions in distributed fiber-optic monitoring systems[J]. Optical Engineering, 54, 055104(2015).

[79] Wang N N, Fang N, Wang L T. Intrusion recognition method based on echo state network for optical fiber perimeter security systems[J]. Optics Communications, 451, 301-306(2019).

[80] Peng K, Feng C, Wang S M et al. Event discrimination method for distributed optical fiber intrusion sensing system based on integrated time/frequency domain feature extraction[J]. Acta Optica Sinica, 39, 0628002(2019).

[81] Cheng J, Song Q H, Peng H K et al. Dual-model hybrid pattern recognition method based on a fiber optic line-based sensor with a large amount of data[J]. Optics Express, 30, 1818-1828(2022).

[82] Lu H N, Wang N N, Fang N et al. Signal recognition method based on Mel frequency cepstral coefficients and fast dynamic time warping for optical fiber perimeter defense systems[J]. Applied Optics, 61, 1758-1765(2022).

[83] Lu H N, Fang N, Wang L T. Signal identification based on modified filter bank feature and generalized regression neural network for optical fiber perimeter sensing[J]. Optical Fiber Technology, 72, 102993(2022).

[84] Zhang Z P. Research on linear Sagnac optical fiber vibration location system based on time delay estimation[D](2022).

[85] Ashry I, Mao Y, Wang B W et al. A review of distributed fiber-optic sensing in the oil and gas industry[J]. Journal of Lightwave Technology, 40, 1407-1431(2022).

[86] Xu Q, Xu H Y, Song Y H et al. Positioning technique based on time-frequency domain method in distributed fiber optic system[J]. Chinese Journal of Scientific Instrument, 35, 2161-2169(2014).

[87] Huang Y, Wang Q, Shi L L et al. Underwater gas pipeline leakage source localization by distributed fiber-optic sensing based on particle swarm optimization tuning of the support vector machine[J]. Applied Optics, 55, 242-247(2016).

[88] Wang Q, Han L J, Fan X W et al. Distributed fiber optic vibration sensor based on polarization fading model for gas pipeline leakage testing experiment[J]. Journal of Low Frequency Noise, Vibration and Active Control, 37, 468-476(2018).

[89] Wang Q, Han L, Liao X. Experiment on a distributed fiber optic interferometric sensing system to monitor and locate urban high-density polyethylene gas pipe leakage[J]. Journal of Optical Technology, 88, 536-542(2021).