1. School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China
2. Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing, Tianjin University, Tianjin, 300072, China
3. Key Laboratory of Optoelectronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China
4. Department of Cardiology, General Hospital, Tianjin Medical University, Tianjin 300052, China