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Optical restoration is known to be an effective way to save on network overall cost, using the same available equipment previously used before the failure occurs. However, when backup paths are too long, some regenerators can be required bringing into question the expected gain. In this work, we show that transponder datarate elasticity is a successful(More)
Spectrum Fragmentation (SF) is considered as a drawback of Gridless Technology (GT). In this paper, we study the impact of SF in a specific incremental traffic scenario and show to what extent anticipating traffic growth can reduce this impact and improves the spectrum usage for next generation of transponders. Numerical results indicate that SF is a real(More)
In this work, we propose and investigate a class-of-service-based multilayer architecture for traffic restoration in elastic optical networks. This architecture benefits from both data rate elasticity and low quality of service requirements of best-effort traffic in IP-over-WDM optical networks, combining 1 + 1 IP protection for gold traffic and optical(More)
The exponential traffic growth in optical networks has triggered the evolution from Fixed-Grid to Flex-Grid technology. This evolution allows better spectral efficiency and spectrum usage over current networks in order to facilitate dynamic and huge traffic demands. The integration of Flex-Grid technology increases the number of optical channels established(More)
Flexible grid optical networks allow an efficient utilization of spectrum resources using 12.5-GHz frequency slot multiples instead of a fixed spacing, introducing however spectrum fragmentation (SF). In the literature, SF is often assumed to be a serious problem specifically in a dynamic traffic context. It is mostly related to the bandwidth blocking ratio(More)
The exponential traffic growth in optical networks has triggered the evolution from fixed-grid to flex-grid technology. This evolution allows better spectral efficiency and spectrum usage over current optical networks in order to facilitate huge dynamic traffic demands. The promise of flex-grid technology in terms of increasing the number of optical(More)
Gridless Technology increases the spectral efficiency of optical fiber transmissions, introducing however spectrum fragmentation. In this work, we show that traffic forecast permits to avoid spectrum fragmentation, even with an uncertainty of 10% on the growth rate. Introduction Conventional fixed grid optical networks are characterized by an inefficient(More)
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