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Inter-core crosstalk is one of the most serious impairments for signaltransmission in a multi-core fiber (MCF) optical network. On the other hand,because of wide deployment of data centers (DCs), we are seeing an increasingbidirectional traffic demand asymmetry, which leads to significant capacitywastage in designing and operating an optical transport network. To alleviatethese effects, for an MCF optical network, we propose to assign fiber cores inan MCF in an asymmetric and counter-propagating manner. This can not onlysignificantly reduce inter-core crosstalk between counter-propagating fibercores but also flexibly assign different numbers of fiber cores in the oppositedirections of a fiber link, thereby overcoming network capacity wastage due tothe bidirectional traffic demand asymmetry. To evaluate the benefits of theproposed strategy, we consider the routing, spectrum, and core assignment(RSCA) problem for the MCF optical network. An integer linear programming (ILP)model and an auxiliary graph (AG) based heuristic algorithm are developed tooptimize network spectrum resource utilization. Simulation studies show theeffectiveness of the proposed core counter-propagation strategy, which cansignificantly outperform its counterpart, i.e., the co-propagation scheme, interms of the total number of MCFs used and average inter-core crosstalk. Inaddition, the proposed RSCA heuristic algorithm is efficient to perform closeto the ILP model, which can minimize the number of MCFs used and crosstalkbetween neighboring cores.

Counter-Propagating Core Assignment in Multi-Core Fiber Optical Networks to Reduce Inter-Core Crosstalk and Capacity Wastage