个人简介
Prof. Shien-Keui Liaw
Prof. Shien-Keui Liaw
National Taiwan University of Science and Technology
标题: Multiple-parameter fiber sensing using variuos fiber Bragg gratings integrated with a WDM device
摘要: 
Fiber sensing has been extensively used in several areas such as petroleum mining and vibration sensing, pressure, acceleration and flow, and strain and temperature measurement in composite materials for aircraft and helicopter structures. Among the current fiber optic sensing systems, fiber Bragg grating (FBG)-based sensor may be the most favorable one due to their real-time and remote sensing ability. In a fiber-laser-based FBG sensing system, the laser cavity forms part of the FBG sensor. Therefore, the changes in the FBG physical condition can be detected directly through the laser wavelength. The fiber laser sensor dynamic range is equivalent to the cavity length. In this talk, several multi-wavelength fiber sensing systems will be designed and demonstrated. The light source may be a semiconductor optical amplifier (SOA) or Erbium-doped fiber amplifier (EDFA). To construct a linear-cavity laser array, the rear cavity end may be a 2 × 2 fiber loop mirror or 3-port optical circulator; while the front cavity end may be a FBG. The characteristics and sensor performance of laser outputfor different sensing distances will be evaluated. The result shows that this SOA-based laser sensor array possesses a dynamic sensing distance of up to 40 km, while stress, temperature, strain and pressure detection were successfully achieved. An array waveguide grating integrated with an optical switch is also used to construct a multiple fiber sensing array with good sensing performance and high reliability.
简介: 
Shien-Kuei (Peter) Liaw received double PhD degrees from National Chiao-Tung University in photonics engineering and from National Taiwan University in mechanical engineering, respectively. He joined the Chunghua Telecommunication, Taiwan, in 1993. Since then, he has been working on optical communication and fiber based technologies. Prof. Liaw joined the department of Electronic Engineering, National Taiwan University of Science and Technology (NTUST) in 2000. He has ever been director of the Optoelectronics Research Center and the Technology Transfer Center, NTUST. He was a visiting researcher at Bellcore (now Telcordia), USA for six months in 1996 and a visiting Professor at University of Oxford, UK for three months in 2011. He owned seven U.S. patents, and authored or coauthored for more than 250 journal articles and international conference presentations. He earned many national honors such as Outstanding Professor of the Chinese Institute of Electrical Engineering in 2015; the winner of The 7th Y. Z. Hsu Scientific Paper Award in 2009; the best project award of National Science and Technology Program for Telecommunication in 2006; the outstanding Youth Award of The Chinese Institute of Electrical Engineering; and the outstanding Youth Academic Award of the Optical Engineering Society of the Republic of China. He has been actively contributing for numerous conferences as technical program chair, international advisory committee, session chair and keynote speaker, invited speaker. He serves as an Associate Editor for Fiber and Integrated Optics. Currently, Dr. Liaw is a senior member of IEEE, OSA and SPIE. Currently, Dr. Liaw is a distinguished Professor and Vice Chairman of ECE department of National Taiwan University of Science and Technology (NTUST), Vice President of the Optical Society (OSA) Taiwan Chapter and Secretary-General of Taiwan Photonic Society.