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A complete, realistic integrated system is investigated, consisting of directly spliced 7-core MCF, cladding-pumped 7-core amplifiers, isolators, and couplers. The system is demonstrated in a 16QAM C-band WDM scenario over 720 km.
We present in-service inter-core crosstalk monitoring for MCF transmission systems. We transmit 54-WDM PDM-16QAM signals over 111.6-km 32-core DSDM transmission line incorporating cladding-pumped 32-core MC-EYDFA, and demonstrate −30 dB crosstalk monitoring without affecting transmission performance.
A heterogeneous single-mode 37-core fiber with a cladding diameter of 248 μm is designed and fabricated. The fiber provides the highest core count and low total-crosstalk less than −20 dB/1000 km in C+L band.
We demonstrate the first 1-Pb/s unidirectional inline-amplified transmission over 205.6-km of single-mode 32-core fiber within C-band only. 96-Gbaud LDPC-coded PDM-16QAM channels with FEC redundancy of 12.75% realize high-aggregate spectral efficiency of 217.6 b/s/Hz.
We demonstrate 32-core dense space-division multiplexed (DSDM) unidirectional transmission of PDM-16QAM 20-WDM signals over 1644.8 km employing a low-crosstalk single-mode heterogeneous 32-core fiber in a partial recirculating-loop system.
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.
We review OTDR technique for measuring a crosstalk (XT) and longitudinal fiber parameters such as mode field diameter (MFD), and relative-index difference in multi-core fibers.
A mode-unbundled ROADM, composed of fiber-based mode-mux/demux and a multi-port MEMS switch, is proposed for MDM networks. The experimental demonstration was performed in single- and two-node configurations, for uni- and bi-directionally mode assigned QPSK and 16-QAM signals, without MIMO DSP.
We propose a technique for measuring properties of cores in a multi-core fibre (MCF) simultaneously by using OTDR and fan-in/out devices. Mode field diameter and relative-index difference of cores in the MCF are successfully estimated by present method.
The inter-core crosstalk of a fabricated few-mode multicore fibre is theoretically and experimentally investigated. By changing the direction of the LP11 mode, the crosstalk between the LP11 mode and the LP01 mode decreased by more than 10 dB.
A homogeneous 31-core fibre with a cladding diameter of 230 μm for quasi-single-mode transmission is designed and fabricated. LP01-crosstalk of −38.4 dB/11 km at 1550 nm is achieved by using few-mode trench-assisted cores.
A novel mode-selective packet switching, based on mode-multiplexers/demultiplexers and multi-port optical MEMS switches, has been proposed and experimentally demonstrated over a 30-km long few-mode fiber link using 16-QAM signals without serious signal impairments.
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.
A mode multiplexer/demultiplexer with a fused-fibre fan-in/fan-out device for three-mode operation of LP01, LP11a, and LP11b is demonstrated using a partially elongated multi-core fibre. A fabricated mode multiplexer/demultiplexer exhibited a coupling efficiency greater than 79% over the C band.
Few-mode multicore fiber (FM-MCF) has the potential to improve the transmission capacity of a fiber drastically. Challenges in designing FM-MCF and characteristics of our fabricated FM-MCF for highly dense space-division multiplexing are reviewed.
An inter-core crosstalk measurement method in a multi-core erbium-doped fibre amplifier that uses a single-wavelength signal with multiple intensity tones is investigated. Its feasibility is confirmed and the output signal power dependence of the crosstalk values for the same signal gains between cores is successfully characterised.
Features of MCFs with dual-ring structure are reviewed. A dual-ring MCF with 12 cores can realize a large Aeff of 105.8 μm2 and small 1550-nm inter-core crosstalk of −51 dB/100 km under limited cladding diameter.
Fan-in/fan-out device for splicing to 12 core multi-core fiber is fabricated. Maximum loss of 4.7 dB at C-band and the worst crosstalk of −45 dB are confirmed in fan-in and fan-out with 20 m-long MCF.
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