共查询到19条相似文献,搜索用时 359 毫秒
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对DWDM系统中的光功率和色散自动调整进行了介绍,并根据40Gbit/s DWDM系统的具体应用提出了包括光功率和色散自动调整在内的链路自动调整实现方式。 相似文献
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随着光网络的发展,特别是DWDM系统和超长传输的出现,利用光放大器直接对光信号进行放大的中继方式被运用到光纤传输系统中,这种方式能极大地延长传输距离,降低系统成本,使得整个系统更加简单、灵活、高效。 相似文献
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基于性能分析的网络攻击效果评估方法研究 总被引:1,自引:0,他引:1
李雄伟 《电子信息对抗技术》2005,20(3):39-42
网络攻击效果评估理论和方法研究在信息系统的安全评估过程中具有深刻的理论指导意义和重要的应用价值。目前,相关研究较少,理论尚不成熟。简要概述了目前一些主要的网络安全评估的理论和方法,在此基础上,分析了网络攻击效果评估的安全性能指标,提出了两种网络攻击效果的评估方法。 相似文献
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Failure Location Algorithm for Transparent Optical Networks 总被引:5,自引:0,他引:5
《Selected Areas in Communications, IEEE Journal on》2005,23(8):1508-1519
Fault and attack management has become a very important issue for network operators that are interested to offer a secure and resilient network capable to prevent and localize, as accurately as possible, any failure (fault or attack) that may occur. Hence, an efficient failure location method is needed. To locate failures in opaque optical networks, existing methods which allow monitoring of the optical signal at every regeneration site can be used. However, to the best of our knowledge, no method exists today that performs failure location for transparent optical networks. Such networks are more vulnerable to failures than opaque networks since failures propagate without being isolated due to optoelectronic conversions. In this paper, we present a failure location algorithm that aims to locate single and multiple failures in transparent optical networks. The failure location algorithm developed in this paper can cope with ideal scenarios (i.e., no false and/or lost alarms), as well as with nonideal scenarios having false and/or lost alarms. 相似文献
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介绍了大信号功率(HSP)攻击和参数比较法的原理;从理论上分析了用参数比较法检测光信噪比实现对HSP攻击检测的可行性,提出了大信号功率攻击的检测器件判决方法。仿真结果表明:被检测器件EDFA的输入和输出端光信噪比之差在有无攻击时的差值,随着攻击功率的增大不断增大,通过测量和计算,可以找出一个合适的差值作为门限来检测光网络中有无HSP攻击的存在。 相似文献