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Few-mode multi-core fiber systems tend to be more prone to core misalignments at splice points. By using the true vector modes of few-mode waveguides we analyze how waveguide properties affect the shape of coupling and mode-dependent loss distributions due to alignment errors between waveguides.
We systematically measure the noise properties of wide-band optical comb lightwave out of a dispersion-engineered nonlinear fiber mixer, which has restricted the use of such comb technology in the pilot-tone-aided coherent transmission over multi-core fibers. We compare the performance of three transmission technologies using different carrier sources, a 11.7-km multi-core fiber link and 10-GBaud...
We describe experiments combining high core-count, homogeneous single-mode multi-core fibers with a wideband comb for high-capacity transmission without high-order MIMO reception and demonstrate wideband transmission with coded modulation up to 12,300 km.
We review progress on high-capacity multi-core fiber systems based on homogeneous, single mode MCF and focus on the limits of high capacity transmission. We discuss issues of inter-core crosstalk, dynamic inter-core skew and their impact on multi-core fiber systems such as pilot-tone transmission and high-dimensional modulation formats. We summarize existing work and include some new results about...
We use a wideband optical comb source with 10THz bandwidth for 2.15 Pb/s transmission over 31km of a new, homogeneous 22-core single-mode multi-core fiber using 399 × 25GHz spaced, 6.468 Tb/s spatial-super-channels comprising 24.5GBaud PDM-64QAM modulation in each core.
We describe the design and characterization of a 3-type heterogeneous 36-core, 3-mode fiber with record spatial channel count and density and perform transmission measurements in all 108 spatial channels using 40×100GHz spaced 25GBaud DP-QPSK signals.
We propose and experimentally investigate a family of multi-dimensional modulation formats for multi-core-fibers. Such formats can have power or spectral efficiency advantages or lower symbol energies but implementation difficulties cause an OSNR penalty.
A reduction of up to 103 times in the carrier-phase estimation rate is demonstrated for self-homodyne, space-division multiplexed, PDM-QPSK systems. This enables a significant energy saving in receiver DSP for self-homodyne systems.
We demonstrate for the first time a fully integrated SDN-controlled bandwidth-flexible and programmable SDM optical network utilising sliceable self-homodyne spatial superchannels to support dynamic bandwidth and QoTprovisioning, infrastructure slicing and isolation.
We discuss the recent progress of space division multiplexed transmission using a 19-core fiber. We find that high core-number multi-core fibers can both enable large transmission capacity and potentially reduce system costs and power consumption.
We show on-demand multi-wavelength spectrum and space defragmentation in an SDM and elastic network with four programmable nodes and two multi-core fiber links. The combined approach is shown to reduce blocking and hardware requirements in small nodes.
We investigate the feasibility of new characterization method of crosstalk properties of multi-core fibers using long wavelength probe signals. Sensitivity of the measurement was found to be improved in most combination of input/output cores.
We demonstrate a significant reduction of the required carrier-phase estimation rate for self-homodyne multi-core fiber systems by analyzing experimental data with implementation-constrained digital signal processing, which could enable an improvement on receiver energy consumption.
We demonstrate a 105.1Tb/s self-homodyne transmission system using low-cost DFB lasers with dynamic path length adjustment and reduced DSP requirement in a 19-core-fiber with each signal core carrying 125×25Gbaud QPSK signals on a 50GHz grid.
We have developed a 19-SDM transmission system consisting of a new low-crosstalk 19-core fiber and a prototype 19-core EDFA. The EDFA uses shared free-space optics to couple pump light into cores and thus is SDM transparent. Recirculating loop experiment with PDM-QPSK signals shows the system feasibility for long-haul transmission over 900 km.
An in-service path length alignment subsystem for phase noise cancellation in self-homodyne coherent detection systems is proposed and demonstrated for spatial division multiplexing multi-core fiber links. Sub-centimeter resolution is demonstrated with penalties below 0.5dB.
We investigate transmission penalties in a high capacity self-homodyne coherent detection system using a 19-core fiber. We show small implementation penalties of under 0.5dB and linewidth independence that may enable transmission of high-order modulation formats.
We report a systematic investigation on Mg doped InGaN epilayers grown by plasma-assisted molecular beam epitaxy. Hall effect, thermopower and electrochemical capacitance voltage experiments have been combined to investigate the conduction properties. The results show the realization of p-type InGaN across the entire alloy composition range.
We review our progress in space division multiplexed (SDM) transmission technology enabling 100-300 Tb/s transmission. As the key components, we describe our free-space SDM multiplexer (MUX) and demultiplexer (DEMUX) and novel multi-core fibers.
We demonstrate record 109-Tb/s transmission of spatial division multiplexed (SDM) signals over 16.8 km using a seven-core fiber. Each SDM channel contains 97 WDM channels on a 100-GHz grid and 2×86-Gb/s polarization-multiplexed QPSK signals.
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