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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.
We demonstrate cladding-pumped six-core Erbium-doped fiber amplifiers (EDFAs) using two different pump coupling schemes: edge-coupled and side-coupled pumping, where a single multimode laser diode can be applied to pump all cores. Using two in-line cladding-pumped EDFAs at the input and output of a 31-km coupled-six-core fiber, we realized 465-km space-division multiplexing and wavelength division...
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.
Photonic-crystal-waveguide-assisted (PCW-assisted) directional coupler fabricated from a hybrid nanophotonic fabrication platform of Si and GaN was studied. The coupler consisted of a Si PCW stacked on top by a GaN ridge waveguide (GaN RdW). High scattered near-infrared intensity at the output ports of the coupler was observed. The maximum coupling found was around 50%. The study may be promising...
Inter-core crosstalk of multi-core fibers is stochastic and heavily dependent on various perturbations such as bend and twist, and of course on fiber structures. Characteristics of the crosstalk are described from theoretical and experimental results.
Various approaches for suppressing inter-core crosstalk of multi-core fiber and state-of-the-art low-crosstalk multi-core fiber feasible to ultra-long-haul transmission are reviewed. Additionally, preferable way to improve spatial spectral efficiency is discussed.
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