Abstract
Multicore fibres (MCF) offer the opportunity of both increasing communication capacity as well as offering enhanced flexibility in the network scenario. Software-defined networks (SDN) are capable of handling novel functionalities coming from physical layer with the aim of better exploit overall connectivity. In this paper, network defragmentation is considered combined with space-division multiplexing (SDM). In particular, SDN-driven effective defragmentation technique on a seven-core MCF is demonstrated. This paper includes a networking view about defragmentation principle exploiting SDN control plane. At the same time, an accurate model and numerical investigations reveal feasibility and system constraints. Push–pull operation for a coherent DQPSK transmission has been experimentally demonstrated together with full dynamic defragmentation. By using a high-speed-integrated dual-output intensity modulator switch for core adaptation in combination with hitless frequency shift, quasi-hitless SDN-driven reconfiguration performances are shown. Defragmentation for $40\,\text{Gb/s}$ DQPSK and $80\,\text{Gb/s}$ 16QAM signals is demonstrated. Switching from core 2 to core 1, $100\text{-}\text{GHz}$ frequency shift, and switching back to core 2 is obtained losing just $1800$ and $2600$ symbols, respectively.
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