People

Hu, Weiwei

Professor

Research Interests: Optical communication

Office Phone: 86-10-6275 2092

Email: wwhu@pku.edu.cn

Hu, Weiwei is a professor in the Department of Electronics, School of EECS. She obtained her Ph.D. from University of Science and Technology of China in Electronic Engineering in 1996. Her research interests include optical communication, optical phased array, and radio over fiber.

Dr. Hu has published more than 100 research papers, and some of them are published in top-tier conferences and journals, such as OFC, ECOC, OL and PTL.

Dr. Hu has more than ten research projects including NSFC, 973 programs, 863 project, etc. Her research achievements are summarized as follows:

1) Optical phased array and beam steering: The high-speed, high-efficient, compact phase modulator array is indispensable in the Optical-phased array (OPA) which has been considered as a promising technology for realizing flexible and efficient beam steering that avoids mechanical moving parts. In her research group, two methods are presented to utilize high-contrast grating (HCG) as high-efficient phase modulator. One is that HCG possesses high-Q resonances that origins from the cancellation of leaky waves. As a result, sharp resonance peaks appear on the reflection spectrum thus HCGs can be utilized as efficient phase shifters. On the other hand, the system designs for silicon-based optical phased array, including the star coupler, phased array, emission elements and far-field patterns are theoretically and experimentally investigated. Further, the non-uniform optical phased array was presented in earlier stage.

2) Milli-meter wave Radio Over Fiber techniques: Optoelectronic oscillator (OEO) is a new type of electrical oscillator which can generate high frequency and low phase noise microwave signals. It has great potentials in the high end applications of radar, wideband wireless receiver, instrumentation, and deep space exploration. Her group focuses on the study of the key technologies of the wideband tunability and low phase noise of OEO. A scheme of wideband tunable OEO based on stimulated Brillouin scattering (SBS) is proposed. A frequency tuning range from near DC to 60 GHz is achieved. To the best of our knowledge, this is the widest fundamental tuning range ever achieved by an OEO.

3) Indoor visible light communication: Indoor visible light communication (VLC) based on white light emitting diodes (LEDs) has drawn extensive interest over the past decade. Apart from providing simultaneous indoor illumination and high-speed data transmission, VLC also features free license, high immunity to electromagnetic interference, enhanced security and green conservation, and it has been predicted that VLC will serve as a potential candidate for the next generation indoor wireless communications. In allusion to the requirement of wide field-of-view and high mobility, the high-diversity space division multiplexing (SDM) VLC scheme using a fisheye-lens-based imaging receiver, which can essentially improve the spatial diversity, and solve the high-spatial-correlation problem of the conventional multiple-input multiple-output (MIMO) VLC system is also proposed.