Abstract
In this work, we present an experimental demonstration of real-time transoceanic space-division multiplexed transmission with coupled-core multicore fibers. To compensate for modal coupling in the coupled-core multicore fibers, we implement real-time multiple-input multiple-output (MIMO) digital signal processing based on field programmable gate array circuits. Using optical receivers with a real-time MIMO, we demonstrate 16-channel wavelength-division multiplexed coupled four-core fiber transmission over 7200 km. The results show the feasibility of real-time coupled-core multicore fiber transmission.
Highlights
I N optical submarine cable systems, as a part of the global communication infrastructure, the total cable capacity must be continuously enlarged to meet the vast future traffic demands
To further increase the number of space division multiplexing (SDM) channels in optical cables, mode division multiplexing (MDM) techniques based on few-mode fibers (FMFs) and coupled-core multicore fibers (CC-Multicore fibers (MCFs)) are more advantageous than the MCF approach
Because spatial mode couplings are inevitable during FMF and CC-MCF propagation, which should be compensated by introducing multiple-input multiple-output (MIMO) digital signal processing (DSP) in optical receivers
Summary
I N optical submarine cable systems, as a part of the global communication infrastructure, the total cable capacity must be continuously enlarged to meet the vast future traffic demands. To further increase the number of SDM channels in optical cables, mode division multiplexing (MDM) techniques based on few-mode fibers (FMFs) and coupled-core multicore fibers (CC-MCFs) are more advantageous than the MCF approach. Because spatial mode couplings are inevitable during FMF and CC-MCF propagation, which should be compensated by introducing multiple-input multiple-output (MIMO) DSP in optical receivers. Real-time MDM transmission experiments over CC-MCFs have been recently reported with real-time FPGA-implemented MIMO DSP for mode equalization [14,15]. With the real-time MIMO DSP in optical coherent receivers, we conduct 16 wavelength-division multiplexed (WDM) 4 MDM dualpolarization (DP) quadrature phase shift keying (QPSK) transmission over a 7,200-km coupled four-core fiber. ・ The number of FIR taps considering the SMD of the coupled four-core fiber and the resource requirement of the FPGA implementation of MIMO processing are described
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