共查询到19条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
介绍了用于光纤通信非线性补偿中的几种非线性光环路镜(NOLM,包括ANOLM、DALM、NALM、DILM、RA-NOLM、NBLM及DANLM)的构成和功能,给出了部分传输补偿实例,指出NOLM的发展趋势是小型化和集成化。 相似文献
5.
光突发交换中的JET协议 总被引:1,自引:0,他引:1
介绍了光突发交换(OBS)中JET协议的基本概念以及JET协议实现时需要考虑的因素,用排队论模型求得了JET协议下OBS网络的突发包丢失率,并分析了OXC配置时间和突发包平均长度对突发包丢失率的影响。 相似文献
6.
对采用光纤延迟线(FDL)解决竞争问题的光突发交换网络节点,本文提出了一种新的数学分析模型计算OBS节点的突发包丢失率。模型基于Markovian链及光纤延迟线,推导了状态方程,并通过数值求解各状态的概率来得出交换节点总的突发包丢失率。与此同时用C++语言对节点的交换过程进行了仿真模拟。分析模型与仿真结果的比较表明,两者的一致性相当好。 相似文献
8.
光突发交换研究综述与应用展望 总被引:5,自引:1,他引:4
介绍了OBS概念与网络结构,总结了国内外研究OBS的热点问题,给出实现OBS的关键技术与方法。通过讨论OBS在Grid网络环境中的潜在应用,给出了相应的模型结构。最后对光突发交换的发展前景做了初步展望。 相似文献
9.
光纤传输技术和光网络技术的发展使得光网络成为现代高速宽带网络的基础骨干网。文章论述了三种光交换技术,并详细分析了光突发交换网络技术原理、交换结构及相关网络协议。在目前光器件和光信息处理方式未取得重大突破之时,光突发交换技术集成光电路交换和光分组交换的优势并且实现方式可行,能满足现有大容量、高速率的多媒体信息交换与传输,将成为下一代光IP骨干网的核心技术。 相似文献
10.
11.
We propose an architecture for a bufferless packet optical switch employing the wavelength dimension for contention resolution. The optical packet switch is equipped with tunable wavelength converters shared among the input lines. An analytical model Is proposed in order to determine the number of converters needed to satisfy prefixed packet loss probability constraints. This analytical model very accurately fits with simulations results. A sensitivity analysis of the required number of converters as a function of the main system parameters (number of input and output lines, number of wavelengths, …) and traffic parameters has been carried out. Making use of the introduced dimensioning procedure we have observed that the proposed architecture allows a saving in terms of employed number of converters with respect to the other architectures proposed in literature. Such a saving can reach about 95% of the number of converters 相似文献
12.
A crucial issue in optical burst switching (OBS) networks is burst loss caused by resource contention. As a result, many methods
are currently being proposed to reduce burst loss rate. These methods can be summed up into two categories: burst scheduling
algorithms and contention resolutions. Both categories of methods can reduce burst loss rate to a certain degree. However,
to make OBS to become a viable solution, the burst loss rate needs to be further reduced. Furthermore, almost all methods
ignore the fact that an unfortunately scheduled, locally generated single-hop burst could block a number of future incoming
transit bursts, though the burst just travels to its next downstream node. This phenomenon becomes more evident when links
are heavily loaded in mesh OBS networks. To eliminate contention caused by single-hop traffic completely, this paper proposes
a novel transfer mode called packet calking by differentiating between single-hop traffic from multihop traffic for OBS networks.
An analysis model is developed to evaluate the performance of packet calking. Theoretical results are validated through extensive
simulations in both ring and mesh networks. These results show that packet calking outperforms the transfer mode without packet
calking in terms of burst loss rate and link utilization. 相似文献
13.
14.
15.
16.
17.
All-optical NRZ-to-RZ conversion through nonlinear optical loop mirrors (NOLM) is analysed. By computing the time-bandwidth output characteristics, we investigate the dependence of the NOLM switching power and control envelope on the chirp of the switched RZ pulses. The effect of this chirp on further propagation in the soliton regime and related continuum generation is then analysed by an inverse-scattering transform 相似文献
18.
19.
Hoang‐Linh To Suk‐Hwan Lee Won‐Joo Hwang 《International Journal of Communication Systems》2015,28(11):1729-1740
We consider optical delay line buffer as a solution to reduce the number of lost burst in optical burst switching, one of the promising candidates for future networks. Such network takes burst loss as an important performance criteria in the design step. Network performance, however, cannot be captured efficiently using traditional queueing models, because they often ignore the impatience of messages traveling through optical switches which is one of the popular issues in communication networks. In this paper, we develop an analytic model for this system using queueing theory and considering special impatience features. Simulation results show that (i) the developed model with impatience features can decrease burst loss probability ( ? 10%) compared with other approaches, and (ii) applying that model, we demonstrate that shared buffer architecture in optical burst switching network with optical buffer often achieves lower burst loss probability than dedicated buffer way in several different scenarios. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献