Article
Computer Science, Information Systems
Eylem Erdogan, Ibrahim Altunbas, Gunes Karabulut Kurt, Michel Bellemare, Guillaume Lamontagne, Halim Yanikomeroglu
Summary: This paper explores the importance and advantages of laser satellite communication, focusing on downlink laser SatCom and proposing an optimization model for reliable connectivity and site diversity. The study derives closed-form outage probability and ergodic capacity expressions, conducts asymptotic analysis, and examines the impact of aperture diameter on performance.
Article
Optics
Dirk Giggenbach, Christian Fuchs, Christopher Schmidt, Benjamin Roediger, Steffen Gaisser, Sabine Klinkner, Duy-Ha Phung, Julien Chabe, Clement Courde, Nicolas Maurice, Herve Mariey, Etienne Samain, Geraldine Artaud
Summary: This article reports on the downlink measurement campaigns conducted with the optical downlink terminal OSIRISv1 onboard the LEO satellite Flying Laptop. The measurements were carried out in collaboration with the French Observatoire de la Cote d'Azur and two Optical Ground Stations of the German Aerospace Center. The data transmission was performed by modulating on/off keyed data at 39 Mb/s on the laser signal, and the pointing of the laser terminal was achieved through open-loop body pointing of the satellite orientation.
Article
Optics
Yiming Bian, Yan Li, Donghao Zheng, Tao Dong, Erhu Chen, Wei Li, Xiaobin Hong, Jifang Qiu, Yin Jie, Yuwei Su, Jian Wu
Summary: This study introduces a geostationary satellite-to-ground communications system using hybrid diversity, which combines aperture diversity with mode diversity, to improve satellite-to-ground laser communications. The performance analysis of the proposed hybrid diversity reception system shows excellent outcomes in terms of outage probability and average bit error rate. The hybrid diversity technique proves to be more efficient in reducing power consumption compared to schemes utilizing only aperture diversity or only six-mode diversity, demonstrating its potential for enhancing satellite-to-ground communications.
OPTICS COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Nilesh Maharjan, Nikesh Devkota, Byung Wook Kim
Summary: This study examines the impact of the atmosphere on satellite-ground FSO communications and provides analysis on FSO channel elements and performance based on different atmospheric conditions. The findings recommend the use of 1550 nm wavelength and larger receiver apertures for improved channel performance.
APPLIED SCIENCES-BASEL
(2022)
Article
Physics, Multidisciplinary
Yoshihiko Saito, Hideki Takenaka, Koichi Shiratama, Yasushi Munemasa, Alberto Carrasco-Casado, Phuc Trinh, Kenji Suzuki, Tetsuharu Fuse, Yasuhiro Takahashi, Toshihiro Kubo-oka, Morio Toyoshima
Summary: The necessity of free-space optical communications has increased in recent years, but they are significantly impacted by the atmosphere. Site diversity technique and transportable optical ground station are two solutions to mitigate the atmospheric influence on FSO communications.
FRONTIERS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Anwen Liao, Zhen Gao, Dongming Wang, Hua Wang, Hao Yin, Derrick Wing Kwan Ng, Mohamed-Slim Alouini
Summary: This paper investigates terahertz Ultra-Massive (UM)-MIMO-based aeronautical communications and proposes an effective channel estimation and tracking scheme to solve the performance degradation problem caused by the unique triple delay-beam-Doppler squint effects of aeronautical terahertz UM-MIMO channels. By utilizing prior-aided iterative algorithms for angle and Doppler shift estimation, and developing a data-aided decision-directed based channel tracking algorithm, the proposed solution effectively mitigates delay-beam squint and Doppler squint, ensuring accurate path delays and channel gains estimation for improved data transmission.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Chao Zhai
Summary: Recent research has shown the significance of anisotropy in atmospheric turbulence for satellite optical communication networks. A new turbulence spectrum model applicable to both vertical and slant links has been proposed in this paper, along with a method to calculate fiber-coupling efficiency.
RESULTS IN PHYSICS
(2021)
Proceedings Paper
Engineering, Aerospace
Luis Fernando Rodriguez Ramos, Joan Torras Estruch, Noelia Martinez Rey, Jorge Socas Negrin, Iciar Montilla, Marcos Reyes Garcia-Talavera, Alex Oscoz, Angel Alonso Sanchez, Pablo Gonzalez de Chaves Fernandez
Summary: IACTEC, the technology transfer division of the Instituto de Astrofisica de Canarias (IAC), is initiating a program to apply optical communications and quantum key distribution using its facilities and experience in free-space optical communications and Adaptive Optics. The main objective of the program is to improve the performance of a Transportable Optical Ground Station (TOGS) by compensating for atmospheric turbulence. This compensation is particularly challenging during daytime operations and in various locations, including ordinary city buildings. Adaptive Optics plays a crucial role in correcting wavefront aberrations caused by atmospheric turbulence, especially when using superconducting nanowire detectors with low dark counts.
2022 IEEE INTERNATIONAL CONFERENCE ON SPACE OPTICAL SYSTEMS AND APPLICATIONS (ICSOS)
(2022)
Proceedings Paper
Engineering, Aerospace
Jorge Socas Negrin, Luis Fernando Rodriguez Ramos, Joan Torras, Iciar Montilla, Angel Alonso, Pablo Gonzalez de Chaves, Noelia Martinez Rey
Summary: This article summarizes the results of a system engineering approach to the design of a Transportable Optical Ground Station (TOGS) intended for quantum key distribution. Adaptive Optics (AO) is proposed to compensate for the effects of atmospheric turbulence and improve signal coupling efficiency.
FREE-SPACE LASER COMMUNICATIONS XXXIV
(2022)
Article
Engineering, Aerospace
Alberto Carrasco-Casado, Koichi Shiratama, Phuc Trinh, Dimitar Kolev, Yasushi Munemasa, Tetsuharu Fuse, Hiroyuki Tsuji, Morio Toyoshima
Summary: NICT is working on developing a miniaturized laser communication terminal that can be installed on small satellites and compatible with various platforms to meet different bandwidth requirements.
Proceedings Paper
Optics
Florian Moll, Dirk Giggenbach, Christopher Schmidt, Christian Fuchs
Summary: This paper investigates the power scintillation phenomenon in free-space optical communications and characterizes it through experiments. The statistical data of power scintillation index over elevation is provided based on the experimental results, and the statistical data of fading margin for link budget calculation is derived.
ENVIRONMENTAL EFFECTS ON LIGHT PROPAGATION AND ADAPTIVE SYSTEMS V
(2022)
Article
Optics
Yousef K. Chahine, Adam C. Wroblewski, John E. Malowicki, Joseph M. Flatico, Gunnar Ristroph, Alex Hsia, Rani Megally, Adam Resnick
Summary: This study presents an analysis of optical scintillation and fade on long slant-path atmospheric channels through a comparison between wave-optics-based numerical simulations and experimental flight data. The simulated power fluctuations, including power spectral density, fade probability, and mean fade time, were found to be in good agreement with measurements taken at slant-path distances ranging from 60 to 113 km and aircraft speeds up to 70 m/s.
OPTICAL ENGINEERING
(2021)
Article
Optics
Muhsin Caner Gokce, Yalcin Ata, Yahya Baykal
Summary: In this study, the effect of adaptive optics corrections on the performance of an aeronautical free-space optical (FSO) system is analyzed. The impact of various system parameters on the bit-error-rate is demonstrated through experiments.
Article
Engineering, Electrical & Electronic
Shaoqi Chen, Xuefen Chi
Summary: In this study, we propose analytical models for Optical Camera Communications (OCC) and derive the maximum data rate for statistical Quality of Service (QoS) guarantee. We also build an imaging model for receiver demodulation and validate our theoretical OCC models through extensive field experiments.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Sabino Piazzolla, William T. Roberts, Joseph Kovalik, Michael Peng, Vachik Garkanian, Christine Chen, William Buehlman, Mark Brewer, Gerardo Ortiz, Kittrin Matthews, Angel Velasco, Abhijit Biswas
Summary: The TBIRD technology demonstration began its operation in June 2022 after being launched in late May 2022. The ground station for TBIRD was set up using the 1-meter diameter telescope at the Jet Propulsion Laboratory, which was equipped with lasers and modem electronics provided by MIT Lincoln Laboratory. The existing Optical Ground Station (OGS-1) supporting NASA's Laser Communications Relay Demonstration (LCRD) was utilized with slight modifications to accommodate TBIRD operations.
FREE-SPACE LASER COMMUNICATIONS XXXV
(2023)