Architecture and design of optical path networks utilizing waveband virtual links
Architecture and design of optical path networks utilizing waveband virtual links
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利用波段虚拟链路的光路网络的体系结构和设计
DOI：
10.1117/12.2209466
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Ken
中科院分区：
文献类型：
--
作者：
Yusaku Ito;Y. Mori;H. Hasegawa;Ken
我们提出了一种新的光网络架构，使用波带虚拟链路，其中每一个可以携带几个光路，直接桥接遥远的节点对。未来的光子网络不仅应该透明地覆盖扩展区域，而且还应该扩展光纤容量。然而，由于频谱变窄，许多ROADM节点的穿越损害了光信号。为了抑制这种退化，需要增加保护带的带宽，这降低了光纤频率利用率。波带粒度切换允许我们在ROADM处应用更宽的通带滤波，并以最小的频率利用偏移在波带之间插入足够的保护带。该方案解决了严重的频谱窄化效应。此外，可以最小化波段中的光信道之间的保护带，这增加了每个光纤可以容纳的路径的数量。在网络中，波长路径粒度路由没有利用波带虚拟链路，它仍然遭受频谱窄化。提出了一种新的网络设计算法，通过限制跳数（需要波长路径级路由的遍历节点）来限制频谱窄化效应。该算法根据业务分布的变化动态地改变波段虚拟链路的配置，其中需要多个节点跳数的光路径有效地由虚拟链路承载。数值实验表明，与传统的光路网络相比，所需的光纤数量减少了23%。
We propose a novel optical network architecture that uses waveband virtual links, each of which can carry several optical paths, to directly bridge distant node pairs. Future photonic networks should not only transparently cover extended areas but also expand fiber capacity. However, the traversal of many ROADM nodes impairs the optical signal due to spectrum narrowing. To suppress the degradation, the bandwidth of guard bands needs to be increased, which degrades fiber frequency utilization. Waveband granular switching allows us to apply broader pass-band filtering at ROADMs and to insert sufficient guard bands between wavebands with minimum frequency utilization offset. The scheme resolves the severe spectrum narrowing effect. Moreover, the guard band between optical channels in a waveband can be minimized, which increases the number of paths that can be accommodated per fiber. In the network, wavelength path granular routing is done without utilizing waveband virtual links, and it still suffers from spectrum narrowing. A novel network design algorithm that can bound the spectrum narrowing effect by limiting the number of hops (traversed nodes that need wavelength path level routing) is proposed in this paper. This algorithm dynamically changes the waveband virtual link configuration according to the traffic distribution variation, where optical paths that need many node hops are effectively carried by virtual links. Numerical experiments demonstrate that the number of necessary fibers is reduced by 23% compared with conventional optical path networks.
DOI：
10.1364/jocn.5.000774
发表时间：
2013-07
期刊：
IEEE/OSA Journal of Optical Communications and Networking
影响因子：
--
作者：
Y. Taniguchi;Yoshiyuki Yamada;H. Hasegawa;Ken-ichi Sato
通讯作者：
Y. Taniguchi;Yoshiyuki Yamada;H. Hasegawa;Ken-ichi Sato