光分组交换网络技术展望

Advances in photonic packet switching systems

综述了当前光网络向高速大容量、智能化和向分组交换转变的发展趋势。介绍了在光域上直接实现数据包的传送、路由、波长变换、存贮和转发的光分组交换技术的优点和目前能够实现光分组交换的几种解决方案 ,包括光突发交换、光标记交换和全光时分复用交换等。光分组交换的核心是光信号处理技术。由于当前缺乏光子存储器和光子集成芯片 ,该技术还处于探索阶段 ,有待光子学新概念和新器件的突破。因此 。

This paper overviews the research and development trends of optical networks moving to high capacity, intelligent and packet switching. The advantage of optical packet switching is that by dividing the information into packets, it can fully utilize the bandwidth statistically by sharing a wavelength pass and obtains high capacity with higher efficiency and flexibility. The core technologies of optical packet switching are the transferring, routing, wavelength converting, buffering and forwarding of optical packets. A few approaches to realize these technologies are briefly introduced including optical burst switching, optical label switching and all optical time division multiplexing switching. The implementation of optical packet switching is difficult at present, and mainly is limited by the need for optical memory and photonic integrated circuits with optical logic functions. For this reason, creative new concepts and novel photonic devices are crucial issues for the research work and commercialization of optical packet switched networks.