We propose a resource allocation method that considers the mode dependence of inter-core crosstalk (IC-XT) in space-division multiplexing elastic optical networks with few-mode multi-core fiber (FM-MCF). In FM-MCF environments, IC-XT tends to increase when higher-order modes or detour routes are used. It is not clear whether the IC-XT can be reduced more effectively by preferentially using detour routes or higher-order modes.To make IC-XT as small as possible, this paper proposes a route and mode selection scheme combined with the conventional core prioritization. Simulation results show that the proposed method reduces the lightpath blocking rate to a 50 times smaller value than that of a naïve benchmark.
Space-division multiplexing elastic optical networks (SDM-EONs) with multi-core fibers (MCFs) are expected to meet the exponentially increasing demand for traffic. However, it is inevitable that inter-core crosstalk (IC-XT) will hinder efforts to increase capacity. Thus, attempts have been made to leverage SDM-EONs by solving the route, modulation format, core, and spectrum assignment problems, but the effects of IC-XT still need to be mitigated. Existing methods such as XT-Aware first fit and core prioritization methods are insufficient for addressing this issue. In this paper, we propose generalized hierarchical core prioritization for the graceful degradation of IC-XT in core and spectrum allocation. Simulation results establish that our approach mitigates adverse influences from IC-XT and has high flexibility in network environments. This study shows that the dynamic resource allocation method, despite being heuristic and computationally inexpensive, can sufficiently reduce the blocking probabilities in any SDM-EONs with hexagonal MCFs.
We propose a spectrum allocation for graceful degradation of inter- core crosstalk in space-division multiplexed elastic optical networks, which utilizes pre-calculated thresholds based on coupled power theory with multiple core selection patterns.
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