Dr. Alberto Carrasco-Casado Profile

Dr. Alberto Carrasco-Casado

Researcher at NICT

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Dr. Carrasco-Casado received his B.S. degree in telecommunication engineering from Málaga University (Spain) in 2005.

He received a M.S. degree in telecommunication engineering in 2008 and a M.S. degree in space research in 2009, both from Alcalá University, Madrid (Spain).

He received his Ph.D. in electric, electronic and automation engineering from Carlos III University of Madrid and Spanish National Research Council in 2015.

In 2015, he joined the Space Communications Laboratory, at NICT (National Institute of Information and Communications Technology) in Tokyo (Japan).

His research interests focus on free-space optics, satellite communications, space engineering and quantum cryptography.

Proceedings Article | 15 March 2023 Presentation + Paper

Conceptual design and analysis of a compact liquid crystal on silicon non-mechanical optical beam steering antenna for lean platforms

F. Ishola, D. Kolev, H. Kunimori, A. Carrasco-Casado, H. Tsuji, M. Toyoshima

Proceedings Volume 12413, 124130N (2023) https://doi.org/10.1117/12.2648857

KEYWORDS: Beam steering, Antennas, Phased array optics, Liquid crystals, Liquid crystal on silicon, Beam shaping, Phase shifts, Telecommunications, Photonic integrated circuits, Design and modelling

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Proceedings Article | 4 March 2022 Presentation + Paper

Preparation of high-speed optical feeder link experiments with HICALI payload

Dimitar Kolev, Koichi Shiratama, Alberto Carrasco-Casado, Yoshihiko Saito, Yasushi Munemasa, Junichi Nakazono, Phuc Trinh, Hideaki Kotake, Hiroo Kunimori, Toshihiro Kubooka, Tetsuharu Fuse, Morio Toyoshima

Proceedings Volume 11993, 119930R (2022) https://doi.org/10.1117/12.2610635

KEYWORDS: Satellites, Telescopes, Sensors, Wavefronts, Adaptive optics, Atmospheric turbulence, Satellite communications

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Proceedings Article | 11 June 2021 Open Access

Modeling of piezoelectric actuator's hysteresis and its effect on the control accuracy of a LEO-to-GEO laser-communication for a small satellite

Phong Xuan Do, Ryo Suzumoto, Alberto Carrasco-Casado, Florian Moll, Takayuki Hosonuma, Morio Toyoshima, Shinichi Nakasuka

Proceedings Volume 11852, 118523B (2021) https://doi.org/10.1117/12.2599541

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Compared to conventional large satellites in the past, small satellite classes (less than 150 kg) show their advantages for mass production, such as short time and low cost for development and launch, to cope with the demand for emerging missions that require a sufficient number of satellites in orbit. However, the traditional communication method, in which a low earth orbit (LEO) small satellite sends data to a ground station using radio frequency, has several disadvantages. Firstly, the limitation of radio-frequency bandwidth leads to a low data rate and difficulty in getting a frequency license. Secondly, there is a significant delay during which data cannot be sent to the ground due to lacking a line of sight between the LEO satellite and the ground station. Additionally, the duration time for the small satellite to communicate with the ground station is just less than 10 minutes approximately. To resolve the above issues, we investigate the case that a less-than-150-kg satellite carries out a laser communication link from LEO to a satellite in geostationary orbit (GEO). Due to the constraints of size, weight, and power (SWaP), traditional bulky LEO-GEO relay systems cannot be applied for the small satellite. However, using the combination of the satellite body pointing and a piezo Fast-Steering Mirror (FSM), which reduces the SWaP considerably, makes it feasible that the LEO-to-GEO communication can be implemented in a small satellite for the first time. While utilizing laser communication can increase the data rate, the relay communication via the GEO satellite helps the small satellite to extend the communication duration significantly. Moreover, since there is a line of sight between the two terminals in any of about 15 orbits per day of the LEO satellite, data taken by the small satellite can be downloaded to the ground via the GEO one in almost real time. This research aims at investigating and proving the feasibility of a small satellite to transmit a laser communication link to its GEO counterpart. In this paper, we describe the LEO-to-GEO laser communication of the small satellite with a study of pointing-budget and link-budget analysis. Furthermore, a hardware-based simulation of the fine control mechanism is conducted. The hysteresis that affects severely to the piezo mechanism, and hence, the final control accuracy, is modeled accurately and its effect is shown.

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Proceedings Article | 12 July 2019 Open Access

Feasibility study of a scalable laser communication terminal in NICT for next-generation space networks

Yasushi Munemasa, Yoshihiko Saito, Alberto Carrasco-Casado, Phuc Trinh, Hideki Takenaka, Toshihiro Kubo-oka, Koichi Shiratama, Morio Toyoshima

Proceedings Volume 11180, 111805W (2019) https://doi.org/10.1117/12.2536131

KEYWORDS: Telecommunications, Satellites, Laser communications, Satellite communications, Optical communications, Ka band, RF communications, Relays, Laser development, Data communications

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Proceedings Article | 12 July 2019 Open Access

Research and Development of a Transportable Ground Optical Station in NICT

Yoshihiko Saito, Yasushi Munemasa, Hideki Takenaka, Hiroo Kunimori, Dimitar Kolev, Alberto Carrasco-Casado, Yoshisada Koyama, Koichi Shiratama, Toshihiro Kubo-oka, Morio Toyoshima

Proceedings Volume 11180, 111805S (2019) https://doi.org/10.1117/12.2536127

KEYWORDS: Telescopes, Free space optics, Active optics, Satellites, Optical communications, Satellite communications, Roads, Optical benches, Telecommunications, Receivers

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Proceedings Article | 12 July 2019 Open Access

Development of “HICALI”: high speed optical feeder link system between GEO and ground

T. Kubo-oka, H. Kunimori, K. Suzuki, Y. Koyama, K. Shiratama, Y. Munemasa, H. Takenaka, D. Kolev, A. Carrasco Casado, T. Phuc, M. Toyoshima

Proceedings Volume 11180, 1118060 (2019) https://doi.org/10.1117/12.2536135

KEYWORDS: Optical communications, Satellite communications, Satellites, Telecommunications, Adaptive optics, Telescopes, Atmospheric optics, Astronomical imaging, Data communications, RF communications

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Proceedings Article | 12 July 2019 Open Access

Effects of atmospheric turbulence and misalignment-induced fading on the secrecy performance of IM/DD free-space CV-QKD systems using a Gaussian beam

Phuc Trinh, Alberto Carrasco-Casado, Anh Pham, Morio Toyoshima

Proceedings Volume 11180, 111801Y (2019) https://doi.org/10.1117/12.2535989

KEYWORDS: Receivers, Transmitters, Modulation, Gaussian beams, Quantum key distribution, Signal detection, Free space optics, Atmospheric propagation, Atmospheric modeling, Atmospheric turbulence

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Proceedings Article | 4 March 2019 Paper

Research and development of highly secure free-space optical communication system for mobile platforms in NICT

Yoshihiko Saito, Hiroyuki Endo, Hideki Takenaka, Yasushi Munemasa, Mikio Fujiwara, Alberto Carrasco-Casado, Phuc Trinh, Mitsuo Kitamura, Toshihiro Kubo-oka, Masahiro Takeoka, Masahide Sasaki, Morio Toyoshima

Proceedings Volume 10910, 109100I (2019) https://doi.org/10.1117/12.2513873

KEYWORDS: Telecommunications, Free space optics, Transmitters, Telescopes, Satellites, Receivers, Free space optical communications, Quantum key distribution, Satellite communications, Quantum communications

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Proceedings Article | 14 May 2018 Paper

QKD from a microsatellite: the SOTA experience

Alberto Carrasco-Casado, Hideki Takenaka, Mikio Fujiwara, Mitsuo Kitamura, Masahide Sasaki, Morio Toyoshima

Proceedings Volume 10660, 106600B (2018) https://doi.org/10.1117/12.2309624

KEYWORDS: Quantum key distribution, Satellites, Polarization, Receivers, Telescopes, Quantum communications, Satellite communications, Information security, Photons, Beam splitters

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Proceedings Article | 15 February 2018 Presentation + Paper

Design status of the development for a GEO-to-ground optical feeder link, HICALI

Yasushi Munemasa, Tetsuharu Fuse, Toshihiro Kubo-oka, Hiroo Kunimori, Dimitar Kolev, Alberto Carrasco-Casado, Hideki Takenaka, Yoshihiko Saito, Phuc Viet Trinh, Kenji Suzuki, Yoshisada Koyama, Morio Toyoshima

Proceedings Volume 10524, 105240F (2018) https://doi.org/10.1117/12.2291881

KEYWORDS: Satellites, Telecommunications, Satellite communications, Optical communications, Laser communications, Ka band, Laser development, Data communications, RF communications, Radio optics

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Proceedings Article | 15 March 2016 Paper

In-orbit verification of small optical transponder (SOTA): evaluation of satellite-to-ground laser communication links

Hideki Takenaka, Yoshisada Koyama, Maki Akioka, Dimitar Kolev, Naohiko Iwakiri, Hiroo Kunimori, Alberto Carrasco-Casado, Yasushi Munemasa, Eiji Okamoto, Morio Toyoshima

Proceedings Volume 9739, 973903 (2016) https://doi.org/10.1117/12.2214461

KEYWORDS: Free space optics, Satellites, Transponders, Satellite communications, Optical communications, Laser communications, Atmospheric propagation, Error analysis, Forward error correction, Sensors, Optical design, Atmospheric optics

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SPIE Journal Paper | 22 August 2014

Correction of beam wander for a free-space quantum key distribution system operating in urban environment

Alberto Carrasco-Casado, Natalia Denisenko, Veronica Fernandez

OE, Vol. 53, Issue 08, 084112, (August 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.8.084112

KEYWORDS: Receivers, Quantum key distribution, Sensors, Turbulence, Atmospheric turbulence, Optical fibers, Optical tracking, Mirrors, Transmitters, Optical engineering

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Proceedings Article | 29 September 2011 Paper

Design and early development of a UAV terminal and a ground station for laser communications

Alberto Carrasco-Casado, Ricardo Vergaz, José Sánchez Pena

Proceedings Volume 8184, 81840E (2011) https://doi.org/10.1117/12.898216

KEYWORDS: Unmanned aerial vehicles, Retroreflectors, Modulation, Polarization, Laser communications, Acquisition tracking and pointing, Laser systems engineering, Infrared cameras, Telescopes, Telecommunications

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Proceedings Article | 5 October 2007 Paper

Ground to survey aerostatic platform bidirectional free space optical link

F. López Hernández, M. Geday, G. del Campo, D. Martin-Fuertes, A. Carrasco-Casado, P. Munuera

Proceedings Volume 6736, 673616 (2007) https://doi.org/10.1117/12.737897

KEYWORDS: Liquid crystals, Modulators, Polarization, Modulation, Receivers, Prisms, Switching, Birefringence, Free space, Free space optics

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