Dr. Qingwen Liu received the B.S. and M.S. degrees from Tianjin University in 2005 and 2007, respectively, and the Ph.D degree in Electronic Engineering from the University of Tokyo, Japan, in 2012. Dr. He joined Shanghai Jiao Tong University as an Associate Professor in 2013.

His research interests include optical fiber sensors and optical optical measurement technologies. He has developed a series of interrogation techniques for fiber grating sensors with high resolution to monitor the crustal deformation; He invented a time-gated digital optical frequency domain reflectometry, which resolves the trade-off between sensing distance and spatial resolution; he also proposed algorithms to solve the fading problem in distributed optical fiber acoustic sensors. Dr. Liu has authored and co-authored more than 160 refereed journal and conference papers, and held 13 patents. His distributed fiber-optic acoustic sensing technology has realized commercial products.

1. Resonant sensors using optical fiber resonators as sensitive units and the multiplexing technology

2. Distributed optical fiber sensing technology based on the phenomenon backscattering in fiber

3. Free-space optical sensing and imaging technology

Fundamentals of Optoelectronics 

Fiber-optic Communication Systems  

Signals and Systems

1. National Natural Science Foundation of China (NSFC) general program, 6217514, High performance distributed fiber-optic acoustic sensor based on external-modulation dual-sideband optical frequency domain reflectometry, 2022.01-2025.12, principal investigator;

2. National Natural Science Foundation of China (NSFC) general program, 61875121, Research on distributed acoustic sensor based on time-gated digital optical frequency domain reflectometry, 2019.01-2022.12, principal investigator;

3. National Key R&D Plan of China, 2018YFC1503703, Development of high-precision geophysical field observation equipment, 2018.12-2021.12, principal investigator of task;

4. National Key R&D Plan of China, 2017YFB0405500, Key technologies and applications of advanced optical fiber sensing materials and devices, 2017.07-2020.12,  principal investigator of task;

5. Huawei Co. Ltd., Observation of welding point, 2021.09-2022.09, principal investigator;

6. Puniu Tech. Co. Ltd., Optimization of distributed fiber sensor systems, 2021.08-2022.07, principal investigator;

7. SJTU Research Cooperation Promotion Center in Fengxian, Position monitoring system of scraper conveyor based on optical fiber technology, 2019.12-2021.10, principal investigator;

8. Puniu Tech. Co. Ltd., High precision distributed temperature sensing system, 2019.10- 2020.10, principal investigator;

9. Puniu Tech. Co. Ltd., Distributed fiber sensor system, 2018.09-2019.08, principal investigator;

10. NeuBrex Co. Ltd., Patented technology implementation license contract, 2018.01-2018.12, principal investigator.

1. Yuanyuan Liu, Qingwen Liu*, Shuangxiang Zhao, Wenchen Sun, Bingxin Xu, Zuyuan He, “Resolution enhancement in coherent diffraction imaging using high dynamic range image,” Photonics, 8(9): 370 (2021).

2. Yuanpeng Deng, Qingwen Liu*, Zuyuan He*, “Distributed Fiber-Optic Acoustic Sensor for Sparse-wideband Vibration Sensing with Time Delay Sampling,” IEEE Sensors Journal  21(12): 13290-13295 (2021) 

3. Zuyuan He, Qingwen Liu*, “Optical Fiber Distributed Acoustic Sensors: A Review,” IEEE Journal of Lightwave Technology 39(12): 3671-3686 (2021) (Invited Tutorial Review)

4. Qingwen Liu, Shuangxiang Zhao, Zuyuan He*, “Improved Pound-Drever-Hall Techniques for High Resolution Optical Fiber Grating Sensors,” IEEE Journal of Lightwave Technology 39(12): 3846-3854 (2021)

5. Yuanyuan Liu, Qingwen Liu*, You Li, Bingxin Xu, Junyong Zhang*, and Zuyuan He*, “High-resolution multi-wavelength lensless diffraction imaging with adaptive dispersion correction,” Optics Express 29(5):7197-7209 (2021) 

6. Yuanyuan Liu, Qingwen Liu*, You Li, Junyong Zhang*, and Zuyuan He, “High-resolution multi-planar coherent diffraction imaging with multimode fiber source,” Optics and Lasers in Engineering 140, 106530 (2021) 

7. He Li, Qingwen Liu*, Dian Chen, Zuyuan He*, “Centimeter spatial resolution distributed temperature sensor based on polarization-sensitive optical frequency domain reflectometry,” IEEE Journal of Lightwave Technology 39 (8): 2594-2602 (2021)

8. Shuangxiang Zhao, Qingwen Liu*, Jiageng Chen, Zuyuan He*, “Resonant fiber-optic strain and temperature sensor achieving thermal-noise-limit resolution,” Optics Express 29(2): 1870-1878 (2021)

9. Shuangxiang Zhao, Qingwen Liu*, Zuyuan He, “White-light-driven resonant fiber-optic strain sensor,” Optics Letters 45(18): 5217-5220 (2020)

10. Shuangxiang Zhao, Qingwen Liu*, Zuyuan He, “Multi-tone Pound-Drever-Hall technique for high-resolution multiplexed Fabry-Perot resonator sensors,” IEEE Journal of Lightwave Technology 38(22): 6379-6384 (2020)

11. He Li, Qingwen Liu*, Dian Chen, Yuanpeng Deng, and Zuyuan He, “High spatial resolution fiber-optic distributed acoustic sensor based on Φ-OFDR with enhanced cross-talk suppression,” Optics Letters 45(2): 563-566 (2020)

12. Dian Chen, Qingwen Liu*, Yifan Wang, He Li, and Zuyuan He, “Fiber-optic distributed acoustic sensor based on a chirped pulse and a non-matched filter,” Optics Express 27(20): 29415-29424 (2019)

13. Shuangxiang Zhao, Qingwen Liu*, Jiageng Chen, and Zuyuan He, “Pico-strain resolution multiplexed fiber grating sensor array interrogated with mode-locked laser,” IEEE Journal of Lightwave Technology 37(18): 4838-4843 (2019)

14. Jiageng Chen, Qingwen Liu*, and Zuyuan He, “Feedforward Laser Linewidth Narrowing Scheme using Acousto-Optic Frequency Shifter and Direct Digital Synthesizer,” IEEE Journal of Lightwave Technology 37(18): 4657-4664 (2019)

15. Shuangxiang Zhao, Qingwen Liu*, Jiageng Chen, and Zuyuan He, “Realization of sub-nano-strain static resolution with injection-locking between two fiber laser sensors,” IEEE Journal of Lightwave Technology 37(13): 3166-3172 (2019)

16. Dian Chen, Qingwen Liu*, and Zuyuan He, “108-km Distributed Acoustic Sensor with 220-pε/√Hz Strain Resolution and 5-m Spatial Resolution,” IEEE Journal of Lightwave Technology 37(18): 4462-4468 (2019)

17. Shuangxiang Zhao, Qingwen Liu*, Jiageng Chen, and Zuyuan He, “pε-resolution fiber grating sensor with adjustable measurement range and ultralow probe power,” IEEE Photonics Technology Letters 31(1):19-22 (2019)

18. Dian Chen, Qingwen Liu*, and Zuyuan He, “High-Fidelity Distributed Fiber-optic Acoustic Sensor with Fading Noise Suppressed and Sub-meter Spatial Resolution,” Optics Express 26(13): 16138-16146 (2018)

19. Qingwen Liu, Mengxin Wu, Jiageng Chen, and Zuyuan He*, “Coherent Pound-Drever-Hall Technique for High Resolution Fiber-optic Sensors at Low Probe Power,” IEEE Journal of Lightwave Technology 36(4):1026-1031 (2018)

20. Jiageng Chen, Qingwen Liu*, and Zuyuan He, “High Resolution Simultaneous Measurement of Strain and Temperature Using pi-Phase-Shifted FBG in Polarization Maintaining Fiber,” IEEE Journal of Lightwave Technology 35(22):4838-4844 (2017)

21. Zuyuan He*, Qingwen Liu*, Jiageng Chen*, and Tomochika Tokunaga*, “Ultrahigh Resolution Fiber Bragg Grating Sensors for Quasi-static Crustal Deformation Measurement,” IEEE Journal of Lightwave Technology 35(16): 3334-3346 (2017)  (Tutorial Review) 

22. Jiageng Chen, Qingwen Liu*, and Zuyuan He, “Time-domain multiplexed high resolution fiber optics strain sensor system based on temporal response of fiber Fabry-Perot interferometers,” Optics Express 25(18): 21914-21925 (2017)

23. Dian Chen, Qingwen Liu*, and Zuyuan He, “Phase-detection distributed fiber-optic vibration sensor without fading-noise based on time-gated digital OFDR,” Optics Express 25(7), 8315-8325 (2017) 

24. Dian Chen, Qingwen Liu*, Xinyu Fan, and Zuyuan He, “Distributed Fiber-optic Acoustic Sensor with Enhanced Response Bandwidth and High Signal-to-noise Ratio,” IEEE Journal of Lightwave Technology 35(10): 2037-2043 (2017)