Placement of Virtualized Elastic Regenerator with Threshold of Path Length in Distance-adaptive Translucent Elastic Optical Networks

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Presented at CRYPIS 2020 by

Distance-adaptive Elastic Optical Networks (EONs) is an efficient network environment, traffic demands in it can flexibly assign the number of Frequency slots (FSs) according to the bandwidth. In distanceadaptive EON, routing, modulation format, and spectrum assignment (RMSA) is the main issue to be solved. Appropriately choosing a routing path and trying to select a better modulation format, the spectral resource can be allocated efficiently. However, due to maximum transmission distance (MTD) constraints, if the transmission distance exceeds MTD, the optical path may fail to be setup unless virtualized elastic regenerators (VERs) are exploited. VERs can regenerate signal and reset the accumulated length of experienced path. For deployment cost reduction, placing VERs strategically would be an important issue. Such a network with limited amount of VERs is so-called translucent EON. In previous studies, neither MTD nor the criticality of a node in all shortest paths and hence the spectrum efficiency is not significant. In this work, we proposed two VER placement strategies to compare with related literature. Our strategies tend to place VERs on the nodes in longer transmission segments and result in better FS consumption. Simulation results demonstrate that the proposed schemes attain notable improvement on blocking performance.