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We demonstrate 246 μm cladding 6-mode 19-core fiber and realize twice the spatial density of other multi-core fiber with more than 100 channels, while achieving the lowest loss and differential mode delay of 0.33 ns/km.
High-density single-mode multicore fibers were designed and fabricated. A heterogeneous 30-core fiber realized a low crosstalk of −55 dB. A quasi-single-mode homogeneous 31-core fiber attained the highest core count as a single-mode multicore fiber.
Multicore fibers and few-mode fibers have the potential to realize dense-space-division multiplexing systems. Several dense-space-division multiplexing system transmission experiments over multicore fibers and few-mode fibers have been demonstrated so far. Multicore fibers, including recent results by our group, are reviewed in this paper.
A 30-core fiber with heterogeneous cores that achieved large spatial multiplicity and low crosstalk of less than −40 dB at 100 km was demonstrated. The correlation lengths were estimated to be more than 1 m.
We demonstrate 120.7-Tb/s SDM/WDM unrepeatered transmission over a 204-km 7-core fiber with aggregate spectral efficiency of 53.6 b/s/Hz using a remotely pumped 7-core EDFA and Raman amplification. 17.2-Tb/s (180 × 95.8 Gb/s) PDM-32QAM signals have been transmitted at each core.
A method to improve the multicore-fiber cable core density is presented. A cable with a core density of 6 cores/mm2 was fabricated. Further improvements in cable core density using a few-mode multi-core fiber are discussed.
Crosstalk characteristic of heterogeneous MCF with homogeneous Aeff is investigated. It is experimentally confirmed that radius around which the crosstalk peaks (Rpk) of smaller than 50 mm is realizable by Δneff of larger than 0.0010.
Characteristics of a 10-core fiber with two-pitch layout were investigated. A core pitch was optimized by simulation. The fabricated fiber realized Aeff larger than 115 μm2 and low-crosstalk characteristics with about 200-μm cladding diameter.
The various types of MCFs with very low crosstalk, large Aeff and low micro-bending loss were discussed. A 10-core MCF with two-pitch layout and a moderate cladding diameter was proposed.
A novel analyzing model of bi-direction OTDR measurement in a hole-assisted fiber (HAF) is proposed. Using this model, both information on the air-hole structure and air-hole surface roughness in a HAF can be detected.
Trench-assisted multi-core fiber (TA-MCF) is proposed to achieve high dense MCF design with a solid structure. The crosstalk value at 1.55 μm of fabricated TA-MCF is estimated to be -35 dB at 100 km.
Power-conversion efficiency reduction on a quasi-homogeneous solid multi-core fiber is numerically investigated. The fiber length dependence of measured crosstalk of fabricated fibers is in good agreement of simulation result by power-coupled equation.
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