Professor Liu Yunqi, Ph.D

Office：
Room B415, Building #12, East Baoshan Campus, Shanghai University

Mail Address：
School of Communication and Information Engineering, Shanghai University, No. 333, Nanchen Road, Shanghai, P. R. China

Zip Code：
200444

Phone：
86-（O）

Email：
yqliu@shu.edu.cn

中文版
URL：
https://scie.shu.edu.cn/Prof/liuyq.htm

Education and Professional Experiences:
2008-present, Professor (Eastern Scholar), School of Communication and Information Engineering, Shanghai University, China
2000-2008, Research Fellow in School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, School of Engineering, City University London, United kingdom and Department of Electronic Engineering, City University of Hong Kong, respectively
July 2000, Ph. D, in Optics, Institute of modern Optics, Nankai University, China

Research Interest:
Optical Communications; Optical Fiber Sensors; Optoelectronics Devices; Fiber Grating Technology; Specialty Fiber Optics

Academic Accomplishments:
Major research interests are Optical Fiber Sensors, Optical Communications and Optoelectronics Devices. More than 160 technical research papers have been published in journals and conferences. More than 130 of them have been cited by SCI and EI.

Other Professional Activities:
Member of International Steering Committee and Technical Program Committee and Session Chair of several international conferences (Asia Communications and Photonics Conference, ACP; International Conference on Advanced Infocomm Technology, ICAIT; International Conference on Optical Communications and Networks, ICOCN), Secretary-general of ACP 2011.
Member of Editorial Board of Journal Shanghai University (Natural Science)
Reviewer of international journals such as Optics Letters, Optics Express, IEEE/OSA Journal of Lightwave Technology, IEEE Photonics Technology Letters, Journal of the Optical Society of America A, Applied Optics, Optics Communications, Optical Engineering, et al.
Member of IEEE
Member of OSA

Research Projects:
1. “Research on few-mode helical long-period gratings and their application in mode-division-multiplexing optical communications”, National Natural Science Foundation of China (**), 2019.1-2022.12, PI.
2. “Research on specialty fiber mode coupling devices based on in-fiber micro-structure”, National Natural Science Foundation of China (**), 2014.1-2017.12, PI.
3. “Research on the fabrication and sensing of the laser-induced micro-structure cladding mode device”, National Natural Science Foundation of China (**), 2011.1-2013.12, PI.
4. “Researches on physical mechanism and application of specialty fiber microstructure devices”, New Century Excellent Talents in University, Ministry of Education (NCET-10-0082), 2010.1-2012.12, PI.
5. “Researches on key techniques of distributed fiber laser sensors”, Key Project of Shanghai Science and Technology Commission (), 2009.8-2012.6, PI.
6. “Researches on long-period gratings written in microstructure specialty fibers”, Shanghai Pujiang Program (09PJ**), 2009.7-2011.7, PI.
7. “Researches on cladding mode based fiber passive devices and their sensing application”, Shuguang Program of Shanghai Education Commission (08SG40), 2009.1-2011.12, PI.
8. “Researches on fiber laser sensors based on fiber gratings”, Key Project of Shanghai Education Committee (09ZZ92), 2009.1-2011.12, PI.

Teaching Courses:
1. Optoelectronics (for undergraduate student)
2. Fundamentals of Photonics (for undergraduate student)
3. Photonics that Changes Your Life (for undergraduate student)
4. Optical Electronic Technology (for graduate student)
5. Progress of Electronic Science and Technology (for graduate student)

Research Students Supervision:
Graduated students: Fang Zou (Ph. D), Liang Zhang (Ph. D), Yunhe Zhao (Ph. D), Tongjian Cai, Wentao Tu, Jianfeng Chen, Jian Zou, Dan Yang, Fangfang Gao, Rui Wu, Feng Li, Zhaodi Wu, Lini Zhu, Jinhua Song, Yuchen Zhao Lingtao Meng, Wentao Chen, Chao Zhou, Hongliang Song, Lei Shi, Bing Li, Guangjun Zheng, Qingquan Wang, Kewang Wang, Xinyu Meng, Xibiao Cao, Dandan Tian, Runhan Zhao, Weicheng Zhao, Guangsheng Li, Yunlong Wang, Huixin Shen and Qiao Wu.
Current Graduate students: Xinyi Zhao (Ph. D student), Zuyao Liu (Ph. D student), Chen Jiang (Ph. D student), Lu Huang, Xiaolong Si, Chengcheng Xu, Ying Li, Kai Guo, Mingxu Li and Linfang Wu.

Patents:
1. Yunqi Liu, Yunhe Zhao, Zhaodi Wu, Yang Hua, Xiaobei Zhang, Tingyun Wang, The device and package method for the fabrication of tapered fiber long-period gratings, Patent ZL 2014 1 **.9
2. Yunqi Liu, Liang Zhang, Shaohua Shi, Hongliang Song, Tingyun Wang, The device for the fiber rotation with large tuning angle, Patent ZL 2015 1 **.7
3. Yunqi Liu, Wentao Tu, Dan Yang, Jian Zou, Tingyun Wang, The device and method for the fabrication of long-period fiber gratings based on the stress-induced refractive index modulation, Patent ZL 2011 1 **.4
4. Yunqi Liu, Jian Zou, Dan Yang, Zhaodi Wu, Tingyun Wang, The device and method for the fabrication of polarization maintaining fiber long-period gratings, Patent ZL 2011 1 **.2

Recent Representative Publications:
In Journals:
1. Yuan-Feng Zhu, Ming-Yang Chen, Yunqi Liu, “Nested Low-Loss Hollow Core Fiber”, IEEE Journal of Selected Topics in Quantum Electronics, 2019, DOI: 10.1109/JSTQE.2019.**.
2. Yunlong Wang, Yunqi Liu, Fang Zou, Chen Jiang, Chengbo Mou and Tingyun Wang, “Humidity sensor based on a long-period fiber grating coated with polymer composite film”, Sensors, 2019, 19(10), 2263; https://doi.org/10.3390/s**.
3. Lu Huang, Xinyu Meng, Yunhe Zhao, Yunqi Liu, “Temperature-insensitive directional bending sensors based on the interlaced tilted long-period gratings”, Optics Communications, 2019, V. 447, 18-23.
4. Chen Jiang, Yunqi Liu, Yunhe Zhao, Liang Zhang, Chenbo Mou, and Tingyun Wang. “Helical long-period fiber gratings inscribed in polarization-maintaining fibers by CO₂-laser,” J. Lightwave Technol., 2019, 37(3), 889-896.
5. Xibiao Cao, Dandan Tian, Yunqi Liu, Liang Zhang and Tingyun Wang, “Sensing characteristics of helical long-period gratings written in the double-clad fiber by CO₂ laser”, IEEE Sensors Journal, 2018, 18(10), 7481-7485.
6. Yunhe Zhao, H. S. Chen, N. K. Fontaine, J. X. Li, R. Ryf, and Yunqi Liu, “Broadband and low-loss mode scrambler using CO₂-laser inscribed long-period gratings,” Optics Letters, 2018, 43(12), 2868-2871.
7. Yunhe Zhao, Tianxing Wang, Chenbo Mou, Zhijun Yan, Yunqi Liu, and T. Wang, “All-fiber vortex laser generated with few-mode long-period gratings,” IEEE Photonics Technology Letters, 2018, 30(8), 752-755.
8. Zuyao Liu, Yunqi Liu, Chenbo Mou, Fang Zou, and Tingyun Wang, “CO₂ laser-written long-period fiber grating with a high diffractive order cladding mode near the turning point”, Applied Optics, 2018, 57(17), 4756-4760.
9. Yunhe Zhao, Changle Wang, Guolu Yin, Biqiang Jiang, Kaiming Zhou, Chenbo Mou, Yunqi Liu, Lin Zhang, and Tingyun Wang, “Simultaneous directional curvature and temperature sensor based on a tilted two-mode fiber Bragg grating,” Applied Optics, 2018, 57(7), 1671-1678.
10. Yunhe Zhao, Yunqi Liu, Chenyi Zhang, Liang Zhang, Guangjun Zheng, Chengbo Mou, Jianxiag Wen, Tingyun Wang, “All-fiber mode converter based on long-period fiber gratings written in few-mode fiber”, Optics Letters, 2017, 42(22) 4708-4711.
11. Xibiao Cao, Yunqi Liu, Liang Zhang, Yunhe Zhao, Tingyun Wang, “Characteristics of chiral long-period fiber gratings written in the twisted two-mode fiber by CO₂ laser”, Applied Optics, 2017, 56(18) 5167~5171.
12. Qingquan Wang, Yunqi Liu, Liang Zhang, Tingyun Wang, “Fabrication of asymmetric long-period gratings in polarization-maintaining fiber with a CO₂ laser”, Applied Optics, 2017, 56(15) 4325~4329.
13. Tianxing Wang, Zhijun Yan, Chengbo Mou, Zuyao Liu, Yunqi Liu, Kaiming Zhou, and Lin Zhang, “Narrow bandwidth passively mode locked picosecond Erbium doped fiber laser using a 45° tilted fiber grating device”, Optics Express, 2017, 25(14): 16708~16714.
14. Liang Zhang, Yunqi Liu, Yunhe Zhao, Tingyun Wang, “High sensitivity twist sensor based on helical long-period grating written in two-mode fiber”, IEEE Photonics Technology Letters, 2016, 28(15): 1629~1632.
15. Liang Zhang, Yunqi Liu, Xibiao Cao, Tingyun Wang, “High sensitivity chiral long-period grating sensors written in the twisted fiber”, IEEE Sensors Journal, 2016, 16(11): 4253~4257.
16. Yunhe Zhao, Yunqi Liu, Liang Zhang, Chenyi Zhang, Jianxiang Wen, Tingyun Wang, “Mode converter based on the long-period fiber gratings written in the two-mode fiber”, Optics Express, 2016, 24(6): 6186~6195.
17. Fang Zou, Yunqi Liu, Shan Zhu, Chuanlu Deng, Yanhua Dong, Tingyun Wang, “Temperature sensitivity enhancement of the nano-film coated long-period fiber gratings”, IEEE Sensors Journal, 2016, 16(8): 2460~2465.
18. Yunhe Zhao, Yunqi Liu, Chao Zhou, Qiang Guo, Tingyun Wang, “Sensing characteristics of long-period fiber gratings written in thinned cladding fiber”, IEEE Sensors Journal, 2016, 16(5): 1217~1223.
19. Fang Zou, Yunqi Liu, Chuanlu Deng, Yanhua Dong, Shan Zhu, Tingyun Wang, “Refractive index sensitivity of nano-film coated long-period fiber gratings”, Optics Express, 2015, 23(2): 1114~1124.
In Conference:
1. Chen Jiang, Yunqi Liu, Chengbo Mou, Tingyun Wang, “Twist sensor using chiral long-period grating written in the double-cladding fiber”, Conference on Lasers and Electro-Optics (CLEO), San Jose, California, USA, 5-10 May 2019.
2. Qianqian Huang, Chen Jiang, Chuanhang Zou, Zinan Huang, Chengbo Mou, Yunqi Liu, “1.94 GHz passively harmonic mode-locked all-fiber laser using polarization-maintaining helical long-period grating”, Conference on Lasers and Electro-Optics (CLEO), San Jose, California, USA, 5-10 May 2019.
3. Xinyi Zhao, Zuyao Liu, Yunqi Liu, Chengbo Mou, Lei Shen, Lei Zhang and Jie Luo, “CO₂ laser inscribed helical long-period grating in six-mode fiber”, Asia Communications and Photonics Conference (ACP 2018), 26-29 Oct. 2018, Hangzhou, China.
4. Zuyao Liu, Xinyi Zhao, Yunqi Liu, Songnian Fu, Chengbo Mou, Fang Zou, “LP01-LP11a/b mode converter based on long-period grating in elliptical few-mode fiber”, Asia Communications and Photonics Conference (ACP 2018), 26-29 Oct. 2018, Hangzhou, China.
5. Lu Huang, Yunqi Liu, Yunhe Zhao, “Simultaneous bending and temperature measurements based on double exposed long period fiber gratings”, Asia Communications and Photonics Conference (ACP 2018), 26-29 Oct. 2018, Hangzhou, China.
6. Chengcheng Xu, Yunqi Liu, Chen Jiang, Tingyun Wang, “Characteristics of helical long-period gratings written in different SMFs by CO₂-laser”, Asia Communications and Photonics Conference (ACP 2018), 26-29 Oct. 2018, Hangzhou, China.
7. Huixin Shen, Yunqi Liu, Chen Jiang, Chengbo Mou, Tingyun Wang, “Elliptical measurement of current sensing based on helical long period grating written in polarization-maintaining fiber”, 26th International Conference on Optical Fibre Sensors (OFS), Lausanne, Switzerland, 24-28 Sept. 2018.
8. Chen Jiang, Yunqi Liu, Yunhe Zhao, Tingyun Wang, “Characteristics of CO₂-laser inscribed polarization-maintaining fiber helical long period gratings”, 13th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2018), Hong Kong, 28 July-3 Aug., 2018.
9. Yunlong Wang, Yunqi Liu, Fang Zou, Chen Jiang, Lu Huang, Tingyun Wang, “Humidity sensor based on long period grating coated with Polyethylene Glycol/Polyvinyl Alcohol”, 13th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2018), Hong Kong, 28 July-3 Aug., 2018.
10. Zuyao Liu, Yunqi Liu, Chengbo Mou, Songnian Fu, “Helical long-period grating inscription in graded-index few-mode fiber for temperature sensing”, 13th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2018), Hong Kong, 28 July-3 Aug., 2018.
11. Yunhe Zhao, Yunqi Liu, Chen Jiang, Chengbo Mou, and Tingyun Wang, “Ultra-broadband mode converter based on an apodized long-period grating in two-mode fiber”, 13th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2018), Hong Kong, 28 July-3 Aug., 2018.
12. Chen Jiang, Yunqi Liu, Yunhe Zhao, Liang Zhang, Chenbo Mou, Tingyun Wang, “Helical Long-period Fiber Grating Written in Polarization maintaining Fiber by CO₂-laser”, Conference on Lasers and Electro-Optics (CLEO), SM2K.2, San Jose, California, USA, 2018.
13. Yunhe Zhao, H. S. Chen, N. K. Fontaine, J. X. Li, R. Ryf, and Yunqi Liu, “Mode scrambler using CO₂-laser Inscribed Long-period Gratings”, Conference on Lasers and Electro-Optics (CLEO), STh3K.5, San Jose, California, USA, 2018.
14. Yunhe Zhao, Yunqi Liu, Chengbo Mou, Neil Gordon, Kaiming Zhou, Lin Zhang, Tingyun Wang”, Femtosecond laser inscribed axial long-period fiber gratings in two-mode fiber for efficient optical angular momentum generation”, 2017 Optical Fiber Communication Conference (OFC)，Los Angeles, California，2017.03.01-2017.03.05.
15. Zuyao Liu, Yunqi Liu, Chengbo Mou, Fang Zou, Tingyun Wang, “High sensitivity refractometer based on long-period fiber gratings with high diffraction order mode at turning point”, The 12th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2017), Singapore, 2017.07.31-2017.08.04.
16. Qingquan Wang, Yunqi Liu, Chengbo Mou, Fang Zou, Tingyun Wang, “Fabrication of double-helix chiral long-period grating in polarization-maintain fiber by CO₂ laser”, The 12th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2017), Singapore, 2017.07.31-2017.08.04.
17. Yunhe Zhao, Changle Wang, Guolu Yin, Biqiang Jiang, Kaiming Zhou, Chengbo Mou, Yunqi Liu, Lin Zhang and Tingyun Wang, “Fiber specklegram sensor based on the twist-induced effect in tilted two-mode fiber Bragg gratings”, The 12th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2017), Singapore, 2017.07.31-2017.08.04.
18. Xinyi Zhao, Yunqi Liu, Zuyao Liu, Yunhe Zhao, Tingyun Wang, Lei Shen, and Su Chen, “Mode converter based on the long-period fiber gratings written in the six-mode fiber”, The 16th IEEE International Conference on Optical Communications & Networks (ICOCN 2017), Wuzhen, Zhejiang, 2017.08.07-2017.08.10.
19. Runhan Zhao, Yunqi Liu, Yunlong Wang, Xingyu Meng, Tingyun Wang, “All-fiber mode converter based on fiber grating and multimode interference”, The 16th IEEE International Conference on Optical Communications & Networks (ICOCN 2017), Wuzhen, Zhejiang, 2017.08.07-2017.08.10. (Best Student Award)
20. Yunhe Zhao, Changle Wang, Zuyao Liu, Kaiming Zhou, Chengbo Mou, Yunqi Liu, Lin Zhang and Tingyun Wang, “Generation of multiple-order OAM modes using a tilted few-mode fiber Bragg grating”, Asia Communications and Photonics Conference (ACP 2017), Guangzhou, China, 2017.11.10-2017.11.13.
21. Yunhe Zhao, Tianxing Wang, Chengbo Mou, Zhijun Yan, Yunqi Liu, Tingyun Wang, “All-fiber laser generating orbital angular momentum beams based on a two-mode fiber long-period grating”，2016 Asia Communications and Photonics Conference (ACP 2016), Wuhan, 2016.11.2-2016.11.5.
22. Yunhe Zhao, Yunqi Liu, Chenyi Zhang, Jianxiang Wen, Tingyun Wang, “Mode conversion of four-mode fiber with CO₂-laser written long-period fiber gratings”, The 2016 Frontiers in Optics/Laser Science Conference, Rochester, New York, 2016.10.17-2016.10.21.
23. Xingyu Meng，Yunqi Liu，Tingyun Wang, “Temperature-insensitive optical strain sensor based on interlaced tilted phase-shifted long-period fiber grating”, 15th International Conference on Optical Communications and Networks (ICOCN 2016), Hangzhou, 2016.9.24-2016.9.27. (Best Student Award)
24. Dandan Tian, Yunqi Liu, Xibiao Cao, Liang Zhang, Tingyun Wang, “Sensing characteristics of CO₂-laser written helical long-period fiber gratings”, 15th International Conference on Optical Communications and Networks (ICOCN 2016), Hangzhou, Zhejiang, 2016.9.24-2016.9.27.
25. Kewang Wang, Yunqi Liu, Guangjun Zheng, Tingyun Wang, “Refractive index sensing characteristics of tilted long period fiber gratings”, 15th International Conference on Optical Communications and Networks (ICOCN 2016), Hangzhou, Zhejiang, 2016.9.24-2016.9.27.
26. Guangjun Zheng, Yunqi Liu, Lei Shi, Runhan Zhao, Tingyun Wang, “Reflective index sensors based on tilted fiber Bragg grating inscribed in the thincore fiber, 15th International Conference on Optical Communications and Networks (ICOCN 2016), Hangzhou, Zhejiang, 2016.9.24-2016.9.27.
27. Xibiao Cao, Yunqi Liu, Kewang Wang, Qingquan Wang, Tingyun Wang, “Fabrication and sensing characteristics of chiral long-period fiber gratings written in the single-mode fiber by CO₂ laser”, 15th International Conference on Optical Communications and Networks (ICOCN 2016), Hangzhou, Zhejiang, 2016.9.24-2016.9.27.
28. Liang Zhang，Yunqi Liu，Yunhe Zhao，Tingyun Wang, “A highly sensitive sensor based on a novel helical long period fiber grating written in the rotated fiber by CO₂ laser”, Asia Communications and Photonics Conference (ACP 2015), Hong Kong, 2015.11.19-2015.11.23.
29. Xinyu Meng, Yunqi Liu, Yunhe Zhao, Tingyun Wang, “Optical fiber bending sensor based on an interlaced tilted long period grating”, Asia Communications and Photonics Conference (ACP 2015), Hong Kong, 2015.11.19-2015.11.23.
30. Yunhe Zhao, Yunqi Liu, Jianxiang Wen, Tingyun Wang, ”Mode converter based on the long period fiber gratings written in two mode fiber”, 20th Opto-Electronics and Communications Conference (OECC 2015), Shanghai, 2015.6.28-2015.7.2.
31. Liang Zhang, Yunqi Liu, Hongliang Song, Tingyun Wang, “Fabrication and sensing characteristics of helical long-period fiber gratings written in the rotated fiber by CO₂ laser”, 24th International Conference on Optical Fibre Sensors (OFS), 2015, Vol. 9634, p. 96346Y.