[1] Muanenda Y, Oton C J, Faralli S et al. A cost-effective distributed acoustic sensor using a commercial off-the-shelf DFB laser and direct detection phase-OTDR[J]. IEEE Photonics Journal, 8, 1-10(2016).
[2] Baker C, Vanus B, Wuilpart M et al. Enhancement of optical pulse extinction-ratio using the nonlinear Kerr effect for phase-OTDR[J]. Optics Express, 24, 19424-19434(2016).
[3] Lu Y L, Zhu T, Chen L et al. Distributed vibration sensor based on coherent detection of phase-OTDR[J]. Journal of Lightwave Technology, 28, 3243-3249(2010).
[6] Li Q, Zhang C X, Li L J et al. Signal-to-noise ratio enhancement of phase-sensitive optical time-domain reflectometry based on power spectrum analysis[J]. Optical Engineering, 53, 026106(2014).
[7] Wu M S, Fan X Y, Liu Q W et al. Highly sensitive quasi-distributed fiber-optic acoustic sensing system by interrogating a weak reflector array[J]. Optics Letters, 43, 3594-3597(2018).
[8] Guo H Y, Zheng Y, Tang J G et al. Reflectivity measurement of weak fiber Bragg grating (FBG)[J]. Journal of Wuhan University of Technology, 27, 1177-1179(2012).
[9] Wang F, Liu Y, Wei T et al. Polarization fading elimination for ultra-weak FBG array-based Φ-OTDR using a composite double probe pulse approach[J]. Optics Express, 27, 20468-20478(2019).
[10] Liu T, Wang F, Zhang X P et al. Interrogation of ultra-weak FBG array using double-pulse and heterodyne detection[J]. IEEE Photonics Technology Letters, 30, 677-680(2018).
[11] de Miguel Soto V, Jason J, Kurto lu D et al. Spectral shadowing suppression technique in phase-OTDR sensing based on weak fiber Bragg grating array[J]. Optics Letters, 44, 526-529(2019).
[12] Ai F, Li H, He T et al. Simultaneous distributed temperature and vibration measurement with UWFBG based coherent OTDR[C]∥2018 Optical Fiber Communications Conference and Exposition (OFC), March 11-15, 2018, San Diego, CA, USA., 1-3(2018).
[13] Shang Y, Yang Y H, Wang C et al. Quasi-distributed acoustic sensing based on identical low-reflective fiber Bragg gratings[J]. Measurement Science and Technology, 28, 015202(2017).
[14] Liu T, Wang F, Zhou L et al. Phase sensitive distributed vibration sensing using double-pulse for ultra-weak FBG array[C]∥2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), July 31-August 4, 2017, Singapore., 1-3(2017).
[15] Li W, Zhang Y J. Enhanced phase sensitive optical time-domain reflectometer vibration sensing system based on weak grating array[J]. Chinese Journal of Lasers, 45, 0810001(2018).
[16] Liu S, Han X Y, Xiong Y C et al. Distributed vibration detection system based on weak fiber Bragg grating array[J]. Chinese Journal of Lasers, 44, 0210001(2017).
[17] Tao X, Jiang S, Song K. Low-cost and long-perimeter system based on weak grating array and its alarm mechanism[J]. Chinese Journal of Lasers, 47, 0406001(2020).
[18] Muanenda Y, Faralli S, Oton C J et al. Dynamic phase extraction in high-SNR DAS based on UWFBGs without phase unwrapping using scalable homodyne demodulation in direct detection[J]. Optics Express, 27, 10644-10658(2019).
[19] Tang J G, Shang F F, Li C L et al. Fiber vibration sensing technologies based on draw-tower grating arrays[C]∥2017 16th International Conference on Optical Communications and Networks (ICOCN), August 7-10, 2017, Wuzhen, China., 1-3(2017).
[20] Todd M D, Seaver M, Bucholtz F. Improved, operationally-passive interferometric demodulation method using 3×3 coupler[J]. Electronics Letters, 38, 784-786(2002).
[21] Liu F, Xie S R, Qiu X K et al. Efficient common-mode noise suppression for fiber-optic interferometric sensor using heterodyne demodulation[J]. Journal of Lightwave Technology, 34, 5453-5461(2016).
[22] Wang J F, Zhang B. Design of adaptive equalizer based on variable step LMS algorithm. [C]∥Proceedings of the Third International Symposium on Computer Science and Computational Technology (ISCSCT’10), August 14-15, 2010, Jiaozuo, China. Oulu: Academy Publisher, 256-258(2010).
[23] Wang C, Shang Y, Liu X H et al. Distributed OTDR-interferometric sensing network with identical ultra-weak fiber Bragg gratings[J]. Optics Express, 23, 29038-29046(2015).
[24] Dong Y K, Chen X, Liu E H et al. Quantitative measurement of dynamic nanostrain based on a phase-sensitive optical time domain reflectometer[J]. Applied Optics, 55, 7810-7815(2016).