天文技术与方法，天文仪器，集成光学，光纤传感。 Design and development of integrated spectrograph systems for astronomical instrumentation, fiber optic instrumentation, fiber interferometry, in fiber integrated optics, fiber tapering, optical system design, and image processing.
 Yiwei Ma, Jing Sun, Senyu Wang, Xiaoyang Li, Yunxiang Yan*, Chengguo Tong, Tao Geng*, Weimin Sun, and Libo Yuan. Fiber Strain Sensor Based on Incline Plane-Shaped Long Period Fiber Grating Induced by CO2 Laser Polishing. in IEEE Journal of Quantum Electronics, 2021, 57(4): 1-5. doi: 10.1109/JQE.2021.3084948  Xiren Jin, Chupeng Lu, Jingyu Lin, Xudong Chen, Xiaoyang Li, Zihang Xiang, Xinghua Yang, Chengguo Tong, Yunxiang Yan*, Tao Geng*, Weimin Sun, Libo Yuan. A strain sensor with low temperature crosstalk based on re-modulation of D-shaped LPFG. Measurement, 2021, 177: 109300. doi: 10.1016/j.measurement.2021.109300  Shuo Zhang, Tao Geng*, Huiwen Niu, Xiang Li, Yunxiang Yan, Cuiting Sun, Sifan Deng, Zemin Wang, Shengjia Wang, Wenlei Yang, Weimin Sun, and Libo Yuan. All fiber compact bending sensor with high sensitivity based on a multimode fiber embedded chirped long-period grating. Optics Letters, 2020, 45(15): 4172-4175. doi: 10.1364/OL.396301  Yunxiang Yan*, Qi Yan, Gang Wang, Weimin Sun*, A-Li Luo, Zhenyu Ma, Qiong Zhang, Jian Li and Shuqing Wang. DEEM, a versatile platform of FRD measurement for highly multiplexed fibre systems in astronomy. Monthly Notices of the Royal Astronomical Society, 2018, 476(4): 4279-4314. doi: 10.1093/mnras/sty461  Yunxiang Yan*, Gang Wang, Weimin Sun*, A-Li Luo, Zhenyu Ma, Jian Li and Shuqing Wang. A modified method for determining the focal ratio degradation and length properties of optical fibres in astronomy. Monthly Notices of the Royal Astronomical Society, 2017, 466(12): 1669-1687. doi: 10.1093/mnras/stw3137  Jing Wang, Yunxiang Yan, Henan Wang, He Tian, Yongjun Liu, Weimin Sun. “Phase-Disturbing Speckle-Suppressing by Contact Fiber Scrambler”. In Fifth International Conference on Instrumentation and Measurement, Computer, Communication and Control, IEEE, Qinhuangdao, 2016  Zhenyu Ma, Liyuan Zhao, Yunxiang Yan, Yongjun Liu, Yu Jiang, Weimin Sun. “Shifting Focal Point of Light Source to Decrease FRD of Astronomical Optical Fibers in LAMOST”. in Fifth International Conference on Instrumentation and Measurement, Computer, Communication and Control, IEEE, Qinhuangdao, 2016  Weimin Sun, Yunxiang Yan, Jing Wang, Hongyuan Fu, He Tian, Yongjun Liu. “Phase disturbing speckle-suppressing method in fiber metrology under coherent illumination”. Proc. of SPIE, 2015  Weimin Sun, Yunxiang Yan, Yu Jiang, Jianchao Zheng. “Mode-Disturbing Effect of Laser Speckle in Optical Fibers”. Proc. of SPIE, 2014  Yunxiang Yan, Ruichen Wang, Weimin Sun, Yongjun Liu. “Investigation of focal ratio degradation caused by stress in Large-Core Astronomical Fibers”. 2013 International Conference on Optoelectronics and Microelectronics, ICOM 2013, IEEE, Harbin, 2013  Ruichen Wang, Yunxiang Yan, Yongjun Liu, Hongquan Zhang, Weimin Sun. “The influence on FRD with different encircled energy”. 2013 International Conference on Optoelectronics and Microelectronics, ICOM 2013, IEEE, Harbin, 2013