A5017696825- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Advanced Optical Network Technologies
- Advanced Wireless Communication Techniques
- Elasticity and Material Modeling
- Error Correcting Code Techniques
- Advanced Fiber Laser Technologies
- Blind Source Separation Techniques
- Fluid Dynamics and Turbulent Flows
- Cellular Mechanics and Interactions
- Aerodynamics and Acoustics in Jet Flows
- Aerodynamics and Fluid Dynamics Research
- Fluid Dynamics and Heat Transfer
- Bone Tissue Engineering Materials
- Syntax, Semantics, Linguistic Variation
- Radiomics and Machine Learning in Medical Imaging
- Connective tissue disorders research
- Aortic aneurysm repair treatments
- Lattice Boltzmann Simulation Studies
- Neural Networks and Applications
- PAPR reduction in OFDM
- Advanced Fiber Optic Sensors
- Aortic Disease and Treatment Approaches
NTT (Japan)
2015-2025
Hachinohe National College of Technology
2025
Institute of Astronomy and Astrophysics, Academia Sinica
2025
Nagoya Institute of Technology
2017-2024
Waseda University
2011-2022
The University of Tokyo
2022
Senshu University
2000-2016
Sekisui Chemical (Japan)
2016
Saitama University
2011-2014
Osaka City University
2013
SUZUKI, O., NAKAMURA, M., MIYASAKA, Y., KAGAYAMA, M. and SAKURAI, Bone Formation on Synthetic Precursors of Hydroxyapatite. Tohoku J. Exp. Med., 1991, 164 (1), 37-50-The aim this study was to investigate the reaction skeletal tissue various synthetic calcium phosphate (Ca-P) compounds in vivo.Five Ca-P were implanted into subperiosteal area calvaria 7-week-old BALB/c mice for one 15 weeks. dicalcium (DCP), octacalcium (OCP), amorphous (ACP), Ca-deficient hydroxyapatile (HA). Implanted DCP,...
Ultra-wideband (UWB) wavelength division multiplexed (WDM) transmission using high-order modulation formats is one of the key techniques to expand capacity per optical fiber. For UWB systems, nonlinear interaction caused by inter-band stimulated Raman scattering (SRS) must be considered. Therefore, we have proposed and demonstrated a scheme optimize fiber input powers for systems considering signal power transition SRS. We single-mode 150.3 Tb/s optimization with 13.6-THz in S-, C-, L-bands...
We report a promising IQ optical modulator for beyond 100-GBd transmitter. By introducing both new n-i-p-n heterostructure and an optimized capacitance-loaded traveling-wave electrode (CL-TWE), high-frequency electrical losses of the can be drastically reduced. As result, we extended electro-optic (EO) bandwidth without degrading other properties, such as half-wave voltage (Vπ) losses. The 3-dB EO 1.5-V Vπ reaches 80 GHz. Furthermore, demonstrated up to 128-GBd modulations by co-assembling...
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.
In the optical communication, ultra-wide band (UWB) wavelength division multiplexing (WDM) transmission systems have been gathering considerable attention because it is becoming rapidly difficult to increase capacity per fiber within conventional limited bandwidths. Our aim extend for UWB WDM from widely used C or L bands additional such as S, E, and O bands. For these wavelengths be in a practical manner, necessary study how repeater configurations multiplexer amplifiers inter-channel...
This article proposes an optical parametric amplifier (OPA), as inline-repeater, using a periodically-poled-LiNbO 3 (PPLN) waveguide with over-10-THz amplification bandwidth, and also presents wide-band wavelength-division-multiplexing (WDM) inline-amplified transmission the OPA.Our PPLN-based OPA is polarization-independent has spectrally efficient configuration by filtering phase-conjugated signals (idlers).We implemented our half its ideal bandwidth because of limited number PPLN...
Optical transmission links are generally composed of optical fibers, amplifiers, and filters. In this paper, we present a channel reconstruction method (CRM) that extracts physical characteristics multiple link components such as longitudinal fiber losses, chromatic dispersion (CD), amplifiers' gain spectra, filters' responses, only from receiver-side (Rx) digital signal processing (DSP) data-carrying signals. The concept is to reconstruct virtual copy an actual in the domain, where fibers...
The optical parametric amplifier (OPA) has attractive features for communications, such as a wideband, high gain, and fast transient response. In addition, by using idler light, which is phase-conjugated light generated in the amplification process, various kinds of signal processing, fiber-nonlinearity mitigation, wavelength conversion, phase-sensitive amplification, can be performed. A periodically poled LiNbO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
This article presents an optical transmitter front-end based on 2:1 analog multiplexer (AMUX) for beyond-1-Tb/s/carrier coherent communications systems. An AMUX is monolithically integrated with modulator driver to realize AMUX-Driver IC that can directly drive modulator. The fabricated by using our in-house 250-nm InP double heterojunction bipolar transistors (DiBTs), which have a peak cutoff frequency (f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Simple high-speed optical transmission technologies are desired for use in intra-and inter-datacenter networks. In this study, we demonstrate simple single-carrier intensity-modulated direct-detection (IMDD) transmissions at a net data rate of 400 Gbps (516.7 gross) over 20 km with compact transmitter subassembly. The subassembly consists 2:1 analog multiplexer (AMUX) and an InP Mach-Zehnder modulator (MZM) placed close to each other connected via wires. We employed 162-Gbaud...
Abstract The Blandford-Znajek (BZ) process is steady electromagnetic energy release from rotating black holes (BHs) along magnetic field lines threading them and widely believed to drive relativistic jets. This successfully demonstrated in general magnetohydrodynamic (MHD) simulations with the coordinate system regular on event horizon, which outward Poynting flux horizon considered reduce BH energy. Meanwhile, alternative pictures for reduction that invoke infall of negative objects were...
Data center networks (DCNs) require a low-cost, low-power optical transceiver to handle increased traffic from generative artificial intelligence, video streaming services, and more. Improving the required signal-to-noise ratio (RSNR) by digital signal processing such as forward error correction (FEC) mitigates requirements for electrical components. The transceivers in DCNs exploit low-complexity soft-decision (SD) FEC, consisting of short block-length linear error-correcting codes SD...
We propose that in Tagalog, a language of the Philippines, two-place predicates can appear with an ergative Agent and absolutive Theme or alternatively bears inherent Case. According to our analysis, couched within Minimalist Program, Case is exceptionally assigned Themes inside VP, these need not move outside VP for Case-checking. note such must be nonspecific interpretation under most circumstances we relate their specificity syntactic position VP. further describe contexts where this...
High-capacity carrier signals with high-order modulation are being considered for data center interconnection (DCI) applications as they can reduce the cost per bit by decreasing number of devices and increasing fiber capacity. However, signal quality degradation due to device imperfections affecting frequency response has limited capacity PDM-256QAM under 400 Gbps. Here, it is possible use a calibration method dealing wherein fixed equalizer separately calibrates transmitter receiver. Our...
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.
We numerically and experimentally investigate the laser phase noise tolerance of probabilistically shaped (PS) uniformly (US) quadrature amplitude modulation (QAM) signals. In simulations, we compare PS-64QAM to US-16QAM, PS-256QAM US-64QAM, PS-1024QAM US-256QAM under same information rate (IR). confirm that a sufficient shaping gain is observed with narrow linewidth lasers, whereas degradation clearly when large high order formats are assumed. our experiments,...
We demonstrate the full C-band 1-Tb/s/λ WDM 800-km transmission with 35-Tb/s capacity employing novel complex 8 × 2 MIMO equalizer which enables simultaneous compensation of imperfections transmitter and receiver 120-Gbaud probabilistically-shaped-64QAM signals.
We demonstrate a 110.7-Tb/s net bitrate over 13×80-km low-water-peak G.652.D fiber transmission using hybrid backward Raman amplifier and TDFA/EDFA in 18.3-THz triple-band WDM with an average 907.6-Gb/s/λ channel rate for 122-channel 144-GBaud PDM-PCS-16/64QAM signals.
A record capacity of 150.3-Tb/s SMF transmission over 40-km is achieved with 13.6- THz ultrawideband WDM 45-GBaud PDM-128QAM signals 11.05-b/s/Hz spectral efficiency by using our proposed optimization scheme fibre input powers considering the nonlinear interaction stimulated Raman scattering.