Research on performance of multicasting in optical packet switched networks

Different multicasting schemes in optical packet switched networks are discussed, including the parallel mode, serial mode, and hybrid mode multicasting schemes. Simulated modeling technique is applied to compare the network-level performance of the three multicasting schemes. A conclusion can be drawn from the results that since the hybrid-mode multicasting scheme can increase the multicast success ratio and reduce the packet retransmission times compared with the other two schemes, it is the best choice for delivering multicasting sessions in the optical packet switched networks.     

Key module for a novel all-optical network coding scheme

<正>We introduce a novel network-coding scheme that can be implemented in all-optical multicast networks.A simple and successful module based on the all-optical XOR gate is designed to realize the network coding scheme.The module is a key hardware component in realizing the proposed scheme.The working principle and the experimental results of the module are also presented.Experimental results show that the function of the module is sufficient in satisfying the requirements of the proposed network coding scheme.     

光分组交换矩阵的实验研究

对光交换矩阵的基本机理进行了研究,介绍了所研制成功的光分组交换矩阵的基本结构、功能、性能和相关的实现技术,重点分析了质子交换型铌酸锂（APE：LiNbO3)光波导开关与相应的系统技术,给出了2．5Gbit/s异步转移模式（ATM）光信元交换实验研究结果。     

全光可调移相器的实现机制与实验研究

本文介绍了我们在国内首次研制成功的全光可调移相器,它采用气隙距离调节法,可在光域上直接实现 ps量级的高速光信号相位(时延)调节,最大调整相位量为 600ps,插入损耗 <7dB,调节精度 <0.03ps.对实现光分组交换、光时分复用、光信号处理等具有重要意义.另外,本文还介绍了光信号相位的精密测量方法     

全光地址识别机理的研究

在面向分组业务的全光交换系统中,采用全光地址处理技术可以减少处理时延,大大提高信息处理速度和网络吞吐量,对全光网络的研究具有重要意义。分析了光正交码的自相关性与互相关性,并将其特性应用于全光传送网中,以针对未来基于光分组业务的全光环网为例,提出了一种光分插复用器的新型结构,给出了总体应用设计规则,重点研究和分析了全光地址识别机理和相关的应用设计方法,给出了针对全光环网组网规模的仿真分析结构和基本实验结果。结果表明采用所提出的设计原则和设计方法来实现全光地址识别是可行的。