Abstract
In this paper, we have investigated an elastic optical network that uses coarse granular routing based on our recently developed coarse granular node architecture. The developed coarse granular optical cross-connect (OXC) architecture that enables routing bandwidth-flexible lightpaths coarse-granularly is based on coarser granular selective spectrum switches. The network takes the advantages of both elastic optical networking and coarse granular routing technologies to cope with the trade-off between the link cost and the node cost in order to build a spectrum-and-cost efficient solution for future Internet backbone networks. We have evaluated the hardware scale requirement and the spectrum utilization efficiency of the network with typical modulation formats under various network and traffic conditions. We also compared the spectrum utilization of our network to that of corresponding traditional WDM network and conventional elastic optical network. Numerical results verified that, similar to conventional elastic optical network, the proposed network offers a substantial spectrum saving comparing to traditional WDM network.
Highlights
The ever-increasing Internet traffic growth has been continuously spurred by newly emerged highperformance and bandwidth-killer applications such as 4k/HD/ultra-HD video, e-Science and cloud/grid computing [1, 2]
The first approach which aims to enhance the spectrum utilization and the network flexibility is currently dominated by the development of elastic optical networking technology [5,6,7,8,9,10,11,12]
In order to exploit elastic optical networking and coarse granular switching for a realizing cost-efficient, spectrum effective and flexible optical transport network, we have recently developed a singlelayer optical cross-connect architecture based on coarse granular switching spectrum selective switches
Summary
The ever-increasing Internet traffic growth has been continuously spurred by newly emerged highperformance and bandwidth-killer applications such as 4k/HD/ultra-HD video, e-Science and cloud/grid computing [1, 2]. Elastic optical networks (EON) realize spectrum- and energy-efficient optical transport infrastructure by exploiting bitrate-adaptive spectrum resource allocation with flexible spectrum/frequency grid and distance-adaptive modulation [8, 9]. They are capable of providing dynamic spectrum-effective and bandwidth-flexible endto-end lightpath connections while offering Telcos (IT/communication service providers) the ability to scale their networks economically with the traffic growth and the heterogeneity of bandwidth requirement [10, 11]. EON is still facing challenges owing to the lack of architectures and technologies to efficiently support bursty traffic on flexible spectrum It requires more complicated switching systems and more sophisticated network planning and provisioning control schemes [12]. A preliminary version of this work with the proposal and limited basic numerical effectiveness evaluation of a bandwidthflexible and coarse granular optical cross-connect architecture was presented at the SoICT conference [19]
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