Liu, Lu

Associate Professor

Research Interests: Optical wireless communication, visible light communication

Office Phone:

Email: luliu@pku.edu.cn

Liu, Lu is an associate professor in the Department of Electronics, School of EECS. He obtained his B.Sc. and Ph.D. from Peking University in 1998 and 2004 respectively. His research interests include Optical Wireless Communication and Visible Light Communication.

Dr. Liu has published more than 30 research papers, and most of them are published in top-tier conferences and journals, such as OFC, PTL, EL, OE, JLT and AO. He also has 4 authorized invention patents. Dr. Liu has more than 10 research projects including NSFC, 863 project, etc. His research achievements are summarized as follows:

1) Ultra-wide Field-of-View acquisition for optical wireless communication: Reliable data transmission in optical wireless communication is on the premise of the successful establishment of the optical link. Wide Field-of-View acquisition can effectively improve the acquisition probability, reduce acquisition time, and provides multi-point access capability for optical wireless networking. He proposed a novel ultra-wide field-of-view acquisition scheme based on fisheye lens and atomic filter. This acquisition scheme utilizes the fisheye lens to obtain the ultra-wide field-of-view with about 180°. An atomic filter with ultra-narrow-pass bandwidth is adopted to resist the strong background radiation induced by the ultra-wide field-of-view. This new scheme can effectively reduce the noise interference, improve the detection signal-to-noise ratio, and can achieve fast establishment of the optical link.

2) High speed visible light communication techniques: One major research topic in visible light communication field is to increase the data rate of the communication system with a single white LED. He proposed some new pre- and post- equalization methods to broaden the transmission bandwidth of the communication system greatly and realized a 715Mbps real-time visible light communication system with a single LED under OOK modulation. To realize a high-bandwidth full-duplex communication, a high-speed uplink is required in the visible light communication systems. He present a wireless 1550-nm laser uplink scheme with large divergence angle for indoor visible light communication systems. This wireless laser uplink scheme enables an all-optical wavelength-division-duplex system to be established while maintains the advantages of the visible light communication downlink, such as enhanced security and no electromagnetic interference.