Keynote Speakers

Keynote Speaker Ⅰ


	Yong Zeng Southeast University, China IEEE Fellow

Keynote Speaker Ⅱ


	Xiaojun Yuan University of Electronic Science and Technology of China, China IEEE Fellow

Keynote Speaker Ⅲ


	Junhui Zhao Beijing Jiaotong University, China IET Fellow

Keynote Speaker Ⅳ

	Yang Zhao Harbin Institute of Technology, Weihai, China

Brief Introduction:
Dr. Yang Zhao is a professor and doctoral supervisor of Information and Communication Engineering at Harbin Institute of Technology, the top innovative talents and experts with the outstanding contribution of Jining City. He is the visiting scholar at Northwestern University (USA). He also serve as the director of Weihai Key Lab of Photoacoustic Testing and Sensing Technology in Harbin Institute of Technology (Weihai). His research interests include the photoacoustic detection, ultrasonic testing and laser-generated sound communication. His research work was supported by National Natural Science Foundation of China, International Cooperation Project supported by Ministry of Science and Technology and Outstanding Young Scientist Plan of Shandong Province, etc. He obtained the honor of outstanding young scientist in Shandong Academy of Sciences. Dr. Zhao has over 90 technical publications, in which more than 60 publications are indexed by SCI/EI. He won the Chinese technology market Science and Technology Golden Bridge Award, China Optical Engineering Society science and technology progress second prize, and Jining City Science and Technology progress first prize.

Speech Title:
Air-Water Cross-Medium Communication by Using a Photoacoustic Method

Abstract:
The Air-Water Cross-Medium Communication (AWCMC) is significant for ocean exploration. The selection of photoacoustic conversion mechanism, modulation method, and underwater sound detection method is critical in solving the problem of AWCMC based on laser-generated sound (LGS) technology. This presentation describes a photoacoustic system used for AWCMC based on a pulsed laser and a fiber optic hydro-acoustic sensor. The pulsed laser is modulated by the way of on-off keying (OOK) modulation, pulse position modulation (PPM) and Frequency-shift keying (FSK) modulation, respectively. Then, thermal expansion was suggested to generate the sound signal at the air-water interface. A novel hydro-acoustic sensor with high sensitivity was developed by utilizing the distributed feedback fiber laser (DFB-FL). The hydro-acoustic sensor uses an enhanced single-path differential divide and differential self-multiplication (SDD-DSM) algorithm in conjunction with a phase-generate carrier (PGC) type demodulation technique to detect LGS signals with great sensitivity. After filtering, envelope extraction, and digital shaping of LGS signals, the modulated information was successfully decoded, demonstrating the potential of OOK-LGS, PPM-LGS and FSK-LGS based on the given photoacoustic communication system applied to the AWCMC.