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This paper addresses the problem of routing and wavelength assignment of multicast sessions with sub-wavelength traffic demands. The authors consider this problem in the scenario of WDM ring networks. In order to support multicasting, individual nodes need to have the capability to duplicate traffic. The authors consider two different node architectures which perform the duplication in optical and electronic domain, respectively. As traffic duplication at the electronic level is much more expensive than the optical alternative, the authors study the problem of assigning routes and wavelengths to the multicast sessions so as to minimize electronic copying.
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