EPON和WDM-PON的分析比较

文章分析了以太网无源光网络(EPON)和波分复用无源光网络(WDM-PON)的多址技术、物理层关键技术和二层协议,特别针对这两种技术点对点仿真(P2PE)的实现给出了详细的分析,比较了这两种技术的性能,最后给出了结论并指出了二者不同的应用方向.     

FAULT-TOLERANT DESIGN OF BATCHER–BANYAN CLASS ATM SWITCHES

Many proposed packet switching systems for high-speed networks have employed the Batcher–banyan fabric due to its modular structure, self-routeing functionality, and distributed conflict-resolving mechanism. In this paper, we present a systematic fault-tolerant design for the Batcher–banyan class of switches. Our first concern is the development of an on-line error detection mechanism which is the prerequisite of any effective fault tolerant operation. Based on the technique developed by Davis, we propose a general fault-testing technique and verify it for a variety of unique-path self-routeing networks. Furthermore, we extend this method to Batcher sorting networks and construct a fault-tolerant Batcher sorter. Lastly, after contemplating the technique constraints and system performance, we deploy the above techniques into different levels of the Batcher–banyan networks and achieve a fault-tolerant version of the StarBurst switch, a member of the Batcher–banyan class of switches.     

光码分多址技术在光接入网中的应用

无源光网络是光接入网的主要发展方向,ＦＴＴＨ是ＰＯＮ的最终方式,将ＯＣＤＭＡ,ＷＤＭ等技术用于光接入网中,是帝现接入网宽带化的途径之一。介绍了ＯＣＤＭＡ的技术报目前光接入网中多址技术的弊端,探讨了ＯＣＭＤＡ用于光接入网的可能性和优势,提出实现无源光网络多址接入的ＷＤＭ／ＣＤＭＡ方案。     

Design and Analysis of a Synchronous Transmission WDMA Protocol

In this paper, we propose a synchronous WDMA protocol for a passive star topology and suggest a new architecture for the network interface of each station. The multichannel nature of WDM networks involves receiver collision phenomena at the destination. We develop an analytical model based on a finite number of tunable receivers and a finite number of stations to investigate the performance of the proposed protocol. Numerical results are showing the performance behaviour for various number of channels, stations, and tunable receivers. Also simulation results are presented for comparison with the results obtained by the performance analysis.     

一种混合WDMA-OCDMA系统归一化吞吐量性能研究

理论分析了一种混合WDMA-OCDMA系统的归一化吞吐量性能.研究了光差拍噪声对系统归一化吞吐量性能的影响.提出了BCH信道编码的方案来改善系统性能.结果表明,当系统负载较轻时,归一化吞吐量略微下降;但当系统负载中等或较重时,归一化吞吐量明显提高.同时,BCH信道编码提高了WDMA-OCDMA系统的归一化吞吐量峰值.     

一种混合WDMA-OCDMA系统的性能分析

分析了一种混合WDMA OCDMA系统的性能,该系统将可用带宽划分成两部分,一部分用于OCDMA用户,另一部分用于WDMA用户。当可用带宽在WDMA与OCDMA之间不同的分配情况下,研究了该混合系统的总用户数和频谱效率。分析结果表明,在要求的误比特率条件下,随着OCDMA系统占用波长信道数目的增加,WDMA OCDMA混合系统的总用户数将增加,而系统的频谱效率将急剧下降。     

多波长OCDMA与WDMA系统的性能分析和比较

分析了色散效应对多波长光码分多址(MWOCDMA)系统的归一化吞吐量性能的影响.光脉冲信号的切普宽度越小,色散效应就越大,MWOCDMA系统的归一化吞吐量性能也就下降得越严重.在考虑色散效应和多用户干扰的情况下,比较了MWOCDMA系统与波分多址(WDMA)系统的归一化吞吐量性能.结果表明:当负载较小时,MWOCDMA系统的性能不如WDMA系统;当负载较大时,MWOCDMA系统的性能优于WDMA系统.     

WaveEPON技术及其应用

介绍了WaveEPON技术及其在FFTH的应用方案,也与TDMA-EPON进行了比较,指出了WaveEPON技术的广阔应用前景。     

Performance analysis and improvement of spectrally amplitude encoded/decoded OCDMA system

This paper describes a performance analysis of an incoherent optical code-division multiple-access scheme based on wavelength/time (W/T) codes. The system supports 16 users operating at 2.5Gb/s/user while maintaining bit-error rate (BER) < 10⁻¹¹ for the correctly decoded signal. It has been observed that there are two major problems giving rise to performance degradation of the system in terms of number of users and type of code.In this paper we have studied the optical simulator Encoding/Decoding for different lengths & gain in terms of Quality factor (Q) and Bit Error Rate (BER) performance. The system supports 16 users while maintaining bit-error rate (BER) < 10⁻¹¹ for the correctly decoded signal. Our aim is to design and simulate a Tree Network Topology Optical Code Division Multiple Access System for large number of users using wavelength–time code and to analyze the performance of the system based on BER and Eye Diagram under the influence of number of simultaneous users with different received powers.     

波分复用OCDMA系统的性能分析

分析了波分复用(WDM)光码分多址(OCDMA)系统的归一吞吐量性能。当同时用户数均匀分配到不同的波长时,得到了WDM OCDMA系统归一化吞吐量性能的上界;当同时用户数尽量分配到同一个波长时,得到了WDM OCDMA系统归一化吞吐量性能的下界。在所有用户均匀分配到不同波长信道的条件下,比较了WDM OCDMA与多波长(MW)OCDMA系统的归一化吞吐量性能。结果表明,当负载较小时,两者的性能基本相当;当负载较大时,WDM 0CDMA的性能优于MW OCDMA系统。同时,WDM OCDMA的归一化吞吐量峰值高于MW OCDMA系统的归一化吞吐量峰值。