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Design and fabrication results of a 6-mode 19-core fiber with the highest relative core multiplicity factor of 30 for weakly-coupled mode-multiplexed uncoupled-core-multiplexed transmission are detailed. Technical challenges for long-haul transmission are also discussed.
The characteristics of coupled-core multi-core fibers (CC-MCF) are reviewed. Random mode coupling and low differential group delay properties of the CC-MCF are discussed, and relationships between differential modal group delay, bends, and twists are also investigated.
We experimentally demonstrate 6×6 coherent multiple-input multiple-output (MIMO) crosstalk mitigation after simultaneous transmission of 3 spatially multiplexed 112-Gb/s PDM-QPSK channels over 24 km of a strongly-coupled 3-core fiber. The crosstalk in the fiber is about −4 dB and is almost completely canceled by MIMO processing.
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