Routing Core and Spectrum Allocation Algorithm for Inter-Core Crosstalk and Energy Efficiency in Space Division Multiplexing Elastic Optical Networks

Abstract

Elastic optical networks (EONs) and space-division multiplexing (SDM) have emerged as a promising technology to accommodate the high-capacity and dynamic bandwidth demands of nextgeneration network. However, the problems of high energy consumption and inter-core crosstalk (ICXT) in space-division multiplexing elastic optical networks (SDM-EONs) are also particularly prominent. In this paper, we proposed an energy efficient grooming and hybrid crosstalk solution (EEG-HCS) algorithm. Firstly, in the routing strategy, a candidate path sorting formula combined the path length and path load state is designed to select the candidate paths and balance the network load. According to the sorting result, whether the current candidate path satisfied the energy efficiency grooming condition or not is determined. When the candidate path meet the energy efficiency grooming condition, the energy efficiency grooming algorithm is used to reduce the transmission energy consumption. For traffic request that do not satisfied the grooming condition, a new optical path is established. Through the core priority grouping, combined with crosstalk avoidance strategy and ICXT aware algorithm, the impact of inter-core crosstalk is minimized, and the probability of successful transmission is improved. In order to evaluate the performance of proposed algorithm, ICXT improvement index is defined. The simulation results show that the proposed algorithm can significantly reduce the energy consumption of space-division multiplexing elastic optical network system while ensuring the optimal blocking probability performance.

An Adaptive Multiobjective Genetic Algorithm with Multi-Strategy Fusion for Resource Allocation in Elastic Multi-Core Fiber Networks

“…Currently, many scholars or teams have been studying the RSCA problem. Among them are: (1) Fujii S, Hirota Y, and Tode H in Osaka, Japan; (2) Muhammad A in Sweden;…”

“…If the crosstalk value of the allocated FSs on the selected transmission path is greater than the given crosstalk threshold, the crosstalk will seriously affect the recovery of the receiver signal and cause the current request to be blocked. Equation ( 2) is used to calculate the mean inter-core crosstalk (XT) [1], which serves as the basis for calculating the crosstalk value for each request and is used widely in existing studies. h = 2k 2 r/(βcp)…”

“…Three connection request groups with different (300, 400, 500) requests are generated as representatives of light, medium, and heavy traffic loads, respectively. The number of FSs required for each connection request in each group is generated in [1,10] uniformly and randomly, and all requests are evenly distributed among source-destination nodes pairs. To avoid the linear and/or nonlinear impairment of MCF, the guardband requires one FS, so that the total number of FSs required for each request is actually in [2,11].…”

“…Therefore, it is urgent to develop a new high-capacity network with variable grids and scalable architecture. Elastic optical networks (EONs) based on orthogonal frequency division multiplexing (OFDM) technology, first proposed in 2008, use the narrow frequency slot (FS) as a unit of resource allocation, which makes it feasible for EONs to dynamically allocate spectrum resources and configure modulation formats according to user demands and traffic volume [1].…”

Analytical Modeling of Switching Fabrics of Elastic Optical Networks

“…The value of parameter η in (20), determining the occupancy distribution in the virtual link, must be matched in such a way as to fulfill the criterion expressed by (19). The value of this parameter is determined in an iterative way, with the following expresions taken into consideration:…”