Optical Network

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Traffic engineering  Traffic grooming  Translucent networks  Transparent island  Transparent networks  

Translucent networks
As discussed, both the electronic switching networks and all-optical transparent networks have their own pros and cons. A translucent network just compromise these two types of networks to take the advantages of the two types of networks to achieve a good balance between cost and network performance. For cost saving, the translucent networks maximally pursue optical bypass opportunities when establishing lightpaths. Only when a lightpath reaches its maximal optical reach, OEO signal regeneration is performed to relay the lightpath. The OEO regeneration can be carried out in either optical channel layer, that is, we just perform signal retiming, reshaping and re-amplifying, but do look into frame detail or perform switching at frame level and grooming subavelength traffic grooming. Another type of OEO regeneration is more advanced, which asks the node for signal regeneration to not only regenerate optical signal, but also look into detail of each frame and perform subwavelength traffic grooming. The latter case can be further divided into L1 and L2 signal regeneration. The L1 signal regeneration only switches and re-grooms time slots, while the L2 signal regeneration switches and re-grooms frames or packets. Translucent optical networks can be divided into two types. The first type is translucent networks with sparsely distributed opaque switch nodes, in which only few switch nodes are electronic and all the other nodes are all-optical. The second type is translucent networks with translucent switch nodes, in which each node is made up of two switch cores, including electronic and optical switches. In most cases, an optical channels just optically bypass an intermediate switch node through the optical switch core, only when the signal quality of the channel becomes poor, requiring to go through a signal regeneration, would the electronic switch core is used to relay the lightpath channel. As the most general case, a translucent optical network can also be comprised of sets of opaque node, translucent nodes, and transparent nodes. Based on today optical transmission technology that generally can be maximally transmitted 2000 to 3000 km before signal regeneration, we think translucent optical networks are the most practical network architecture for next-generation optical transport networks.
Added: 29th July 2010 08:48:31 AM   Modified: 29th July 2010 08:48:31 AM

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