Abstract
We focus on the efficient modeling and optimization of the flow restoration in the spectrally-spatially flexible optical networks (SS-FONs) realized using a single mode fiber bundle. To this end, we study a two-phase optimization problem, which consists of: (i) the network planning with respect to the spectrum usage and (ii) the flow restoration after a failure aiming at maximizing the restored bit-rate. Both subproblems we formulate using the integer linear programming with two modeling approaches—the node-link and the link-path. We perform simulations divided into: (i) a comparison of the proposed approaches, (ii) an efficient flow restoration in SS-FONs—case study. The case study focuses on the verification whether the spectral-spatial allocation may improve the restoration process (compared to the spectral allocation) and on the determination of the full restoration cost (the amount of additional resources required to restore whole traffic) in two network topologies. The results show that the spectral-spatial allocation allows us to restore up to 4% more traffic compared to the restoration with only the spectral channels. They also reveal that the cost of the full traffic restoration depends on plenty of factors, including the overall traffic volume and the network size, while the spectral-spatial allocation allows us to reduce its value about 30%.
Highlights
Due to the increasing number of network users, connected devices and their special interest in bandwidth-intensive services, the overall network traffic rapidly increases and is expected to exceed transmission possibilities of currently deployed solutions in the near future
In this paper we put our attention on the singlemode fiber bundle (SMFB) due to its support for the largest range of the switching policies, including (i) independent switching (IndSw)—each spatial mode can be freely directed to any output port, and (ii) fractional switching (FracSw)—spatial modes can be switched in groups containing a subset of all modes [2,3,4]
The second part of the investigation was a case study which evaluated the potential benefits of the spectral-spatial allocation in the flow restoration process as well as determining the cost of full restoration in spectrally-spatially flexible optical network (SS-FON)
Summary
Due to the increasing number of network users, connected devices and their special interest in bandwidth-intensive services, the overall network traffic rapidly increases and is expected to exceed transmission possibilities of currently deployed solutions in the near future. The restoration process, which is in the focus of that paper, is run after a failure occurs It aims at the restoring as much traffic as possible (i.e., re-allocating demands whose paths are no longer available) with respect to the current network resource availability. Electronics 2021, 10, 1468 a single link failure aiming at maximizing the restored bit-rate Both related subproblems we formulate using the integer linear programming (ILP) approach applied with two flow modeling techniques—the node-link (ND) and the link-path (LP). We verify whether the spectral-spatial allocation may improve the flow restoration in SS-FON (compared to the restoration with only spectral channels) and we determine the cost (i.e., the required amount of additional spectrum resources) of the full traffic restoration.
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