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A world record capacity 118.5 Tbit/s transmission through optical fiber with a 125 micron cladding diameter was achieved using a low loss and 316 km-long full space division multiplexing link incorporating multiple vendor technologies.
A 128-GS/s 63-GHz-bandwidth 2:1 analog-multiplexer (AMUX) module has been developed for ultrabroadband digital-to-analog (D/A) conversion subsystems. The AMUX IC was fabricated using 0.5-μm-emitter InP HBTs, which have a peak ft and fmax of 290 and 320 GHz, respectively. The IC has a through bandwidth of 67 GHz. We developed an ultra-low-loss metal package equipped with G3PO (SMPS) connectors. The...
Methodologies for DMD and MDL mitigation in SDM transmission are reviewed. We clarify frequency selective channels over a multicore few-mode fiber with experimental evaluations, and their impact on signal transmission from a signal processing perspective.
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 review the recent progress of long-haul SDM transmission experiments and the issues to be addressed. Also described are advanced MIMO processing techniques we have developed to achieve low-complexity DMD compensation and MDL-tolerant transmission.
We demonstrated an excellent output power (Pout) density performance using a novel InAlGaN/GaN-HEMT with an 80-nm gate for a high-power W-band amplifier. The developed HEMT showed basic reliability for commercial products. A unique double-layer silicon nitride (SiN) passivation film with oxidation resistance was adopted to suppress current collapse. The developed discrete InAlGaN/GaN-HEMT achieved...
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.
A method is described for applying space-time coding implemented by Hadamard transform to SDM transmission. Experiments demonstrated that the method substantially improves mode dependent loss tolerance and enables transmission reach to be enhanced by 20%.
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.
We experimentally demonstrate that a single coherent receiver can successfully receive mode and polarization division multiplexed signal using MDM-to-FDM signal conversion scheme based on our proposed mode-selective coherent detection technique to develop low-complexity MDM systems.
Steep subthreshold-slope (SS) devices are attracting much interest because of their capability of reducing the power dissipation in digital ICs. However, the mechanism for obtaining a steep SS often interferes with the low on-resistance that is required for a high on-current. The introduction of a doped superlattice into the source was recently proposed as a solution to this problem. However, to our...
We demonstrated an excellent output power (Pout) density performance using a novel InAlGaN/GaN-HEMT with an 80-nm gate for a W-band amplifier. To eliminate current collapse, a unique double-layer silicon nitride (SiN) passivation film with oxidation resistance was adopted. The developed discrete GaN-HEMT achieved a Pout density of 3.0 W/mm at 96 GHz, and we fabricated W-band amplifier MMIC using the...
Hafnium Disulfide (HfS2) is one of the transition metal dichalcogenides which is expected to have high electron mobility and finite bandgap. However, the fabrication process for HfS2 based electron devices has not been established, and it is required to bring out the superior transport properties of HfS2. In this report, we have investigated the effects of ALD HfO2 passivation on the current properties...
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.
Issues that need to be addressed for long-haul SDM transmission are discussed. Newly developed advanced MIMO processing schemes are presented that achieve low-complexity mode dispersion compensation and tolerance enhancement for mode dependent loss.
We successfully developed fabrication process of 16nm InGaAs channel multi gate MOSFETs with regrown source and drain by using MOVPE. This device showed 707 µA/µm of Id.max and 498 µS/µm of gm.max. On-off ratio was 103 @ Vd = 0.5V.
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