A5057060134- Optical Wireless Communication Technologies
- Satellite Communication Systems
- Semiconductor Lasers and Optical Devices
- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Space Satellite Systems and Control
- Orbital Angular Momentum in Optics
- Spacecraft Design and Technology
- Advanced Optical Sensing Technologies
- Advanced Optical Network Technologies
- Adaptive optics and wavefront sensing
- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Gamma-ray bursts and supernovae
- Quantum Computing Algorithms and Architecture
- Opportunistic and Delay-Tolerant Networks
- Ocular and Laser Science Research
- Astrophysics and Cosmic Phenomena
- Optical Network Technologies
- Impact of Light on Environment and Health
- Inertial Sensor and Navigation
- Radiation Detection and Scintillator Technologies
- Image Enhancement Techniques
- Infrared Target Detection Methodologies
- Quantum optics and atomic interactions
National Institute of Information and Communications Technology
2015-2024
Toshima Manufacturing (Japan)
2019
Engineering Science Analysis (United States)
2019
Meta (United States)
2019
University of Portland
2019
Instituto de Tecnologías Físicas y de la Información “Leonardo Torres Quevedo”
2016
Consejo Superior de Investigaciones Científicas
2014-2016
Heinz Optical Engineering (United States)
2016
Unidades Centrales Científico-Técnicas
2014
Universidad Carlos III de Madrid
2011-2013
Models of quantum systems on curved space-times lack sufficient experimental verification. Some speculative theories suggest that properties, such as entanglement, may exhibit entirely different behavior to purely classical systems. By measuring this effect or thereof, we can test the hypotheses behind several models. For instance, predicted by Ralph and coworkers [T C Ralph, G J Milburn, T Downes, Phys. Rev. A, 79(2):22121, 2009, Pienaar, New Journal Physics, 16(8):85008, 2014], a bipartite...
Quantum communication, and more specifically Key Distribution (QKD), enables the transmission of information in a theoretically secure way, guaranteed by laws quantum physics. Although fiber-based QKD has been readily available since several years ago, global communication network will require development space links, which remains to be demonstrated. NICT launched LEO satellite 2014 carrying lasercom terminal (SOTA), designed for in-orbit technological demonstrations. In this paper, we...
The use of free-space optical (FSO) systems as secure transmission media has recently attracted research efforts worldwide. However, their secrecy performance may be compromised by the presence an adversarial eavesdropper. In addition, misalignments between transceivers could severely affect legitimate FSO channel and increase eavesdropping risks. This paper, for first time, offers a complete framework to analyze impact eavesdropper's location on terrestrial under generalized atmospheric...
Free-space optics (FSO)-based, low-earth orbit (LEO) satellite-assisted Internet of vehicles (IoVs) has recently attracted research efforts worldwide. For the majority applications, transmission control protocol (TCP) is one most widely deployed protocols. Nevertheless, a complete understanding TCP performance over FSO-based IoVs networks still lacking in literature. This highly challenging issue, as consequence non-trivial interdependencies between losses caused by dynamics/uncertainty...
The utilization of drones as flying base stations (BSs) in the sixth-generation (6G) cellular networks has attracted much attention recently. In this context, free-space optical (FSO) systems could be deployed to provide high-capacity fronthaul/backhaul links between and ground BSs. Particularly, a drone-to-ground FSO communication link can established by equipping drone with modulating retro-reflector (MRR) modulate incoming beam reflect modulated back along same path. This helps alleviate...
Free-space optical (FSO) systems are compulsory to realize high capacity and interference-free communication links from low-Earth orbit (LEO) satellite constellations as well spacecraft space stations the Earth. To be integrated with high-capacity ground networks, collected portion of incident beam should coupled into an fiber. accurately evaluate signal-to-noise ratio (SNR) bit-error rate (BER) performance metrics, probability density function (PDF) fiber coupling efficiency (CE) must...
The Japanese National Institute of Information and Communications Technology (NICT) plans to launch a 6U CubeSat into Low Earth Orbit (LEO) during the fiscal year 2025. primary payload for this mission is CubeSOTA (CubeSat’s Small Optical TrAnsponder), miniaturized free-space optical communication terminal currently under development. A key component amplifier, which must provide high transmission gain overcome significant losses caused by long distances involved in space communications....
Due to the recent rapid growth of computing technologies, today's encrypted information based on classical computational complexities will soon no longer remain secure. Quantum cryptography, or quantum key distribution (QKD), relying physical laws mechanics, stands out as a more powerful cryptographic solution that enables secret be shared securely over publicly unsecured communication channels in presence eavesdroppers. QKD can possibly implemented both optical fiber and free-space (FSO)...
Abstract Laser communications from small satellite platforms empowers the establishment of quantum key distribution (QKD), relying on superposition states single photons to realize unconditional security between distant parties at a global scale. Although recent breakthrough experiments have demonstrated feasibility satellite-to-ground QKD links, underlying statistical characteristics atmospheric channels not been well-understood and experimentally verified in literature. In this paper, we...
Research and development of space optical communications is conducted in the National Institute Information Communications Technology (NICT). The NICT developed Small Optical TrAnsponder (SOTA), which was embarked on a 50kg-class satellite launched into low earth orbit (LEO). space-to-ground laser communication experiments have been with SOTA. Atmospheric turbulence causes signal fadings becomes an issue to be solved satellite-to-ground links. Therefore, as error-correcting functions,...
In this article, we introduce our vision for the future non-terrestrial networks beyond 5G and discuss possible implementation scenarios free-space optical communication technology in it, especially regarding satellite communications segment. We show some of latest system developments globally field small satellites. Together with projects National Institute Information Communications Technology (NICT) Japan payloads moving platforms, a specific trend is clearly defined. further newly...
CubeSats are excellent platforms to rapidly perform simple space experiments. Several hundreds of have already been successfully launched in the past few years and number announced launches grows every year. These provide an easy access for universities organizations which otherwise could not afford it. However, these spacecraft still rely on RF communications, where spectrum is crowded cannot support growing demand data transmission ground. Lasercom holds promise be solution this problem,...
Free-space quantum key distribution links in urban environment have demanding operating needs, such as functioning daylight and under atmospheric turbulence, which can dramatically impact their performance. Both effects are usually mitigated with a careful design of the field view receiver. However, trade-off is often required, since narrow improves background noise rejection but it linked to an increase turbulence-related losses. In this paper, we present high-speed automatic tracking...
An air-to-ground free-space optical communication system has been designed and partially developed. The design covers both the communications between airborne ground station, acquisition, tracking pointing. A strong effort made in order to achieve minimum payload power, size weight, for which a MEMS modulating retroreflector chosen. In new technique fine pointing, based on liquid crystal device, is proposed will be demonstrated, as well other improvements with aim of optimizing station performance.
Low photon-level signals used in most free-space quantum communication systems require a narrow field of view the receiver to minimize amount background noise coupled into single photon detectors. This can be achieved through beam tracking techniques, which compensate atmospheric effects, such as wander, receiver, reducing long-term area. However, diameter this area below few microns, typically necessary achieve low level solar and successful daylight transmission, fine precision...
With the goal of meeting diverse requirements many different types platforms, ranging from small drones to big satellites, and being applied in a variety scenarios, fixed terrestrial links moving platforms general, operating within wide range conditions distances, Japanese National Institute Information Communications Technology (NICT) is currently working towards development series versatile miniaturized free-space laser-communication terminals. By choosing appropriate terminal...
The Japanese National Institute of Information and Communications Technology (NICT) is currently developing a high-performance laser-communication terminal for CubeSats aiming at providing high-datarate communication solution LEO satellites requiring to transmit large volumes data from the orbit. A key part system high-power optical amplifier capable enough gain transmitted signals be able close link on its counterpart's receiver with smallest impact in terms energy power CubeSat's platform....
Broadband communication using satellites requires use of the Ka band. Services this type are now emerging all over world, some with capacities in excess 100 Gbps. However, as radio bandwidth resources become exhausted, high-speed optical can be used instead to achieve ultra-broadband communications. The National Institute Information and Communications Technology (NICT) Japan researches develops next generation space technology. A hybrid satellite system frequencies is being studied. Here,...
In National Institute of Information and Communications Technology (NICT) JAPAN, an ultra high speed optical satellite communication equipment onboard the engineering test IX has been developing. The is planned to be launched geosynchronous orbit in 2021. this project, we are aiming for high-speed data transmission at world's highest level 10 [Gbps] both uplink downlink between ground stations satellite. This paper outlines mission, scheduled experiment, examination HICALI based system...
We study a dynamic scheme for optimizing the beam waist in low earth orbit-to-geostationary orbit (LEO-to-GEO) laser communication small satellites under influence of pointing error on transmitting side. Using Marcum Q-function, we express channel gain link closed form. Based this expression, obtain an accurate approximation optimal value via both numerical and analytical approaches to achieve minimal average bit probability (ABEP) LEO-to-GEO communication. The has simple form can be...
Beyond-5G (B5G) technology plays a pivotal role in the next generation of communication infrastructure to support future Society 5.0, concept introduced 5th Basic Plan for Science and Technology by Japanese Cabinet define long-term growth strategy reconciling economic development with resolution social issues through promotion science technologies. Free-space laser is key element boosting data transmission capabilities required B5G applications. The NICT will complete 2024 first fully...