A5101455181- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Advanced Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Optical Wireless Communication Technologies
- Innovative Microfluidic and Catalytic Techniques Innovation
- Particle Detector Development and Performance
- Fluid Dynamics and Mixing
- Nonlinear Optical Materials Studies
- Advanced Optical Sensing Technologies
- Superconducting and THz Device Technology
- Magnetic Bearings and Levitation Dynamics
- Impact of Light on Environment and Health
- Electric Motor Design and Analysis
- Advanced Wireless Communication Techniques
- Building Energy and Comfort Optimization
- Satellite Communication Systems
- TiO2 Photocatalysis and Solar Cells
- Blind Source Separation Techniques
- Nanofabrication and Lithography Techniques
- Flow Measurement and Analysis
- Adaptive Control of Nonlinear Systems
- Sensor Technology and Measurement Systems
- Laser Design and Applications
ETH Zurich
2025
Mitsubishi Electric (Japan)
2014-2023
Information Technology Laboratory
2022
Mitsubishi Electric (United States)
2017-2020
The University of Tokyo
2010-2015
Toyo University
2015
Mitsubishi Group (Japan)
2012-2013
Kyushu University
2012
Mitsubishi Heavy Industries (Japan)
2012
Mitsubishi Heavy Industries (Germany)
2012
Following on from current 1 Gb/s to 10 based passive optical networks (PON), IEEE 802.3ca has commenced discussion of the first 100 Gb/s-based PON standard in form G Ethernet (100G-EPON), anticipation growing bandwidth demand by emerging applications such as fixed-mobile convergence for 5G and beyond (B5G) where mobile front-haul back-haul (MFH/MBF) will require greatly increased capacity up Tb/s. In move toward these Tb/s class PONs, research into latest coherent technology systems is being...
We propose a 100-Gb/s/λ-based coherent wavelength division multiplexing passive optical network system with hardware-efficient digital signal processing (DSP), which features new adaptive equalization (AEQ) and carrier phase recovery (CPR). While conventional AEQ consists of four finite impulse response (FIR) filters in butterfly configuration, we to split the into 1-tap FIR filter two nonbutterfly halve number long filters, sacrificing compensation differential group delay (DGD). To reduce...
In this paper, we review the latest progress in simplified digital coherent technologies suitable for future beyond-100G optical access systems, which will be a key transport platform meeting very wide range of extreme requirements beyond-5G (B5G) and 6G users. As centerpiece technical challenges recent demonstrations ultimate-capacity passive network systems carrying more than 100 Gb/s per wavelength by using incorporating low-complexity signal processing (DSP) are presented. addition, to...
Future passive optical network (PON) systems supporting more than 50 Gb/s/λ present a challenge for the use of intensity modulation direct detection (IM-DD). Since coherent technology improves receiver sensitivity over that IM-DD, it is promising candidate 100 Gb/s or higher PON systems. Introducing hardware-efficient signal processing technologies tailored to will help render suitable We here review introduce two types simplified adaptive equalization (AEQ), one which sacrifices...
We proposed a novel burst-mode coherent detection scheme for receiving 100-Gb/s DP-QPSK upstream signals. In 100 Gb/s/A-based TDM-PON, fast 816-ns reception on individual wavelength ONUs was demonstrated with achieving 33.0-dB loss budget.
We demonstrated a 9-aperture transmit and single aperture receive FSO system transmitting 35-WDM 400 Gb/s DP-PS-16-QAM signals over 220 m. By splitting the WDM into 9 groups, eye-safe power density was enabled.
We have built a four-pole high temperature superconducting (HTS) permanent magnet synchronous motor (PMSM) in our lab. At this stage, the HTS PMSM uses two 2G racetrack coils, which are YBCO wires, type 344 from AMSC, and four conventional copper coils as stator windings. 75 bulks mounted on surface of rotor. After pulsed field magnetization system had been developed tested lab 2011, rotor can trap magnetic field. This makes possible for application, other than coils. The successfully run at...
We report the design and performance of engineering model digital signal processing system called Pulse Shape Processor (PSP) for Soft X-ray Spectrometer (SXS) onboard ASTRO-H satellite. The SXS employs an microcalorimeter system, in which photons are detected as a heat pulse due to photoelectric absorption. pixelized HgTe absorbers cooled down 50 mK. required energy resolution is 7 eV (FWHM) at 6 keV. Since data link satellite recorder limited 200 kbit s <formula formulatype="inline"...
To achieve a link budget capable of supporting high capacity free space optical communication (FSO), transmit power is required. However, the transmitter can become potentially hazardous to human eye. For C-band be classified as Class 1 eye-safe, intensity should limited such that passing through 24.5 mm diameter area below 10 dBm. In this work we used 9-aperture transmit, single-aperture receive FSO system reduce intensity. Wavelength division multiplexed (WDM) signals were divided into 9...
We implemented distribution matching and dematching (DM/invDM) on an FPGA in a back-to-back configuration, for the first time demonstrating very low BERs.At post-FEC BER of 1.5×10 -15 , after invDM 1.6×10 -14 was measured.
Building a distributed virtual environment that scales to many participants in low bandwidth, high latency networks is technical challenge. The key issues are maintaining acceptable performance the face of links, and consistency shared world data between multiple participants. paper describes overall architecture enables one build such wide area, targeted Internet. relies on spatial partitioning scene reduce communication, replication hide latency, group communications maintain replica...
We propose fast, low-complexity widely-liner compensation for IQ imbalance in 100-Gb/s/λ coherent TDM-PON. The proposed method reduces the power penalty to 0.3 dB, achieving 32.4-dB loss budget 100-Gb/s DP-QPSK bursts with an 826-ns overhead.
To realize energy saving in electrical appliances and electric vehicles, it is necessary to reduce the power consumption of motors operating at variable speeds. We developed a technique that changes poles permanent magnet (PM) motor depending on speed. Here, we propose novel PM number without changing winding connections discuss its basic configurations principles. Pole-changing accomplished using d-axis current proposed for magnetization. Our analysis results confirm pole-changing reduces...
This paper considers a robust sliding mode control scheme using multirate output feedback. Using different plant rates including the former information, sampling error at multiple interval is considered to discrete-time feedback design. As result, performance can be improved. Meanwhile, also guarantee closed-loop system stability.
We review the recent progress of latest 100G to 1T class coherent PON technology using a simplified DSP suitable for forthcoming 5G era optical access systems. The highlight is presentation first demonstration 100 Gb/s/λ × 8 (800 Gb/s) based PON.
We propose a 100 Gb/s/λ-based coherent WDM-PON with hardware-efficient DSP. By introducing 1-tap butterfly filter and an inter-polarization phase offset estimation, multiplications are reduced 40%. Downstream loss budget of 39.7 dB supporting 8 ONU over 80 km was demonstrated.
We present the development status of Pulse Shape Processor (PSP), which is on-board digital electronics responsible for signal processing X-ray microcalorimeter spectrometer instrument (the Soft Spectrometer; SXS) ASTRO-H satellite planned to be launched in 2014. finished design and fabrication engineering model, are currently undertaking a series performance verification environmental tests. In this report, we summarize results obtained part tests completed first half year.
We review hardware-efficient DSP technologies, especially about AEQ and CPR suitable for PON systems. DGD tolerance evaluation in a numerical simulation of 100 Gb/s/λ-based coherent WDM-PON system with is presented.
For high capacity free space optical (FSO) communication systems, expected be used to support extended coverage for the sixth generation mobile service, digital coherent technology and wavelength division multiplexing in fiber communications are promising technologies. These technologies can generate signals supporting Tb/s level capacity. However, achieve link budget required links, transmit power order of 100 W is required, achieving output with an amplifier challenging. In this work we...
We studied laser noise numerically and experimentally in terms of frequency variance within estimation response time, showed that a normalized below 1×10-6 is required to limit the penalty 0.5 dB.