A5015224735- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Advanced Optical Network Technologies
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Advanced Wireless Communication Techniques
- Nuclear Physics and Applications
- Radio Frequency Integrated Circuit Design
- Optical Wireless Communication Technologies
- Semiconductor Quantum Structures and Devices
- Radioactive element chemistry and processing
- X-ray Spectroscopy and Fluorescence Analysis
- Blind Source Separation Techniques
- Hemoglobin structure and function
- Nuclear reactor physics and engineering
- Magnetic Field Sensors Techniques
- Power Line Communications and Noise
- Radioactivity and Radon Measurements
- graph theory and CDMA systems
- Wood Treatment and Properties
- Air Quality and Health Impacts
- Semiconductor materials and devices
Kumamoto University
2001-2025
Tokyo University of Science
2010-2025
NTT (Japan)
2015-2024
Japan Broadcasting Corporation (Japan)
2023
Mitsui Chemicals (Japan)
2023
Waseda University
2018
Harvard University
2004-2015
Shibaura Institute of Technology
2007
Harvard University Press
1999-2005
Kanazawa University
1997-2005
We demonstrate 1.01-Pb/s transmission over 52 km with the highest aggregate spectral efficiency of 91.4 b/s/Hz by using low-crosstalk one-ring-structured 12-core fiber. Our multi-core fiber and compact fan-in/fan-out devices are designed to support high-order modulation formats up 32-QAM in SDM transmission.
This paper describes coherent optical orthogonal frequency division multiplexing (CO-OFDM) techniques for the long-haul transmission of 100-Gb/s-class channels. First, we discuss configurations transmitter and receiver that implement multiplexing/demultiplexing high-speed CO-OFDM transmission. Next, review no-guard-interval (No-GI) scheme which utilizes OFDM signal generation intradyne configuration with digital processing (DSP). We examine characteristics proposed scheme, show No-GI offers...
We demonstrate dense SDM transmission of 20-WDM multi-carrier PDM-32QAM signals over a 40-km 12-core × 3-mode fiber with 247.9-b/s/Hz spectral efficiency. Parallel MIMO equalization enables 21-ns DMD compensation 61 TDE taps per subcarrier.
We demonstrate 102.3 Tb/s transmission over 3×80 km of PSCF by employing 548-Gb/s PDM-64QAM single-carrier frequency-division-multiplexing (SC-FDM) signals with pilot tone and 11.2-THz ultra-wideband low-noise amplification in the C- extended L-bands.
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 1 m.
Induction of haem oxygenase-1 (HO-1) may provide an important protective effect for cells against oxidative stress. Here, we investigated the mechanism cytoprotection HO-1 in solid tumour with a focus on antiapoptotic activity HO-1. Treatment rat hepatoma AH136B HO inhibitor zinc protoporphyrin IX (ZnPP IX) or tin resulted extensive apoptotic changes both vivo and vitro. Caspase-3 ZnPP IX-treated increased significantly. Moreover, IX-induced apoptosis was completely inhibited by simultaneous...
Heme oxygenase (HO) is a key enzyme in heme metabolism; it oxidatively degrades to biliverdin, accompanied by formation of free iron and carbon monoxide. Biliverdin subsequently reduced cytosolic biliverdin reductase form bilirubin, potent antioxidant. We recently found that tumor cells utilize HO protect themselves from oxidative stress producing the antioxidant bilirubin. This result suggested an important potential therapeutic strategy: suppression bilirubin production with use...
The authors demonstrate +11 dBm-per-channel 320 Gbit/s (8 × 40 Gbit/s) WDM transmission over a 367 km zero-dispersion-flattened line with 120 repeater spacing using nonlinearity-tolerant carrier-suppressed return-to-zero format.
We demonstrated, for the first time, a novel spectrum-efficient elastic optical path network 100 Gb/s services and beyond, based on flexible rate transceivers variable-bandwidth wavelength crossconnects.
We demonstrate the record total capacity of 69.1 Tb/s with a spectral efficiency 6.4 b/s/Hz by employing 21.4-Gbaud 16-QAM modulation, blind digital coherent detection, and 10.8-THz ultra-wideband amplification in C- extended L-bands.
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 12.75% realize high-aggregate spectral efficiency 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 fiber in partial recirculating-loop system.
We demonstrate 246 mm cladding 6-mode 19-core fiber and realize twice the spatial density of other multi-core with more than 100 channels, while achieving lowest loss differential mode delay 0.33 ns/km.
For short-reach applications, 40-Gb/s directly modulated semiconductor lasers enable high-capacity transmission with a simple and low-cost configuration. We investigated the chirp characteristics of 1.55-/spl mu/m distributed-feedback laser diodes (DFB-LDs) measured linewidth enhancement factor dynamic chirp. then evaluated fiber-dispersion dependence bit error rates (BERs) dispersion tolerance for transmissions.
As an important part of the civilization in China, ancient Chinese architecture has indigenous and unique system construction that retained its principal characteristics from prehistoric times to present spread influence other countries such as Korea Japan. With exacerbating environmental encroachment time impacts have been reducing their structural resistance, it become imperative preserve this architectural heritage. To provide basic timber structures fundamental information for research...
We demonstrate 102.3 Tb/s transmission over 3⨉80 km of PSCF by employing 548Gb/s PDM-64QAM single-carrier frequency-division-multiplexing (SC-FDM) signals with pilot tone and 11.2-THz ultra-wideband low-noise amplification in the C- extended L-bands.
We demonstrate 12-core × 3-mode dense SDM transmission over 527 km graded-index multi-core few-mode fiber without mode-dispersion management. Employing low baud rate multi-carrier signal and frequency-domain equalization enables 33.2-ns DMD compensation with computational complexity.
A world record capacity 118.5 Tbit/s transmission through optical fiber with a 125 micron cladding diameter was achieved using low loss and 316 km-long full space division multiplexing link incorporating multiple vendor technologies.
We demonstrate the phase sensitive amplification of a high-order quadrature amplitude modulation (QAM) signal using non-degenerate parametric in periodically poled lithium niobate (PPLN) waveguide. The interaction between pump, signal, and phase-conjugated idler enables us to amplify arbitrary components signal. 16QAM signals are amplified without distortion because high gain linearity PPLN-based amplifier (PSA). Both noise reduction capabilities PSA ensured. Phase cancellation is achieved...
By employing 111Gb/s no-guard-interval coherent OFDM and SNR maximized second-order distributed Raman amplification in the extended L-band, we demonstrate record capacity-distance product of 84.3Petabit/s.km (13.5Tb/s × 6,248km), also 1Tb/s transmission over 9,612km.
A heterogeneous single-mode 37-core fiber with a cladding diameter of 248 μm is designed and fabricated. The provides the highest core count low total-crosstalk less than −20 dB/1000 km in C+L band.
We propose ultra-broadband optical frontend module consisting of an IQ-modulator, driver ICs, and bandwidth multiplexers. 192-GBaud QPSK 160-GBaud 8QAM signals were successfully generated by using the 80-GHz based on in-house InP technology.