4.29学术报告会通知

学术报告会通知

题目： Photonics in Radar-Frontend Applications

报告人： Prof. Yifei Li and Peter Herczfeld

(ECE Department of the University of Massachusetts Dartmouth.

& Drexel University)

时 间： 2010年4月29日（周四）下午15:00-17:00

地 点： 东南大学(四牌楼校区) 李文正楼 6楼 614会议室

主办单位: 东南大学毫米波国家重点实验室

IEEE AP-MTT-EMC Joint Nanjing Chapter

江苏省电子学会天线与微波专委会

内容简介：

In radar frontends it is desirable to replace bulky coax cables with optical fibers in order to achieve smaller size, lighter weight and the immunity to electro-magnetic interference. Unlike the baseband fiber-optic links that dominate the present long haul telecommunications, the fiber-optic links for RF signal transmission are still immature. In particular, they suffer from limited dynamic range due to the nonlinearities in the optical modulation/demodulation processes. Recently a coherent fiber-optic link employing an Optical Phase-Locked Loop (OPLL) phase demodulator was proposed. This new fiber-optic link can offer a dynamic range improvement of 20dB or larger over the current state-of-the-art. The challenge is to implement a high gain wideband OPLL phase demodulator. The OPLL tightly integrates local optical phase modulators, high power photodetectors and other photonic components. There are three critical issues in implementing OPLL photonic integrated circuit: minimizing the loop propagation delay, improving the local phase modulator linearity, and increasing the photodetector saturation photocurrent. In this talk we will discuss the approaches for solving these problems, the design of OPLL photonic integrated circuits, and the related experimental results.