Pub Date : 2022-03-28DOI: 10.1109/ICSOS53063.2022.9749711
A. Carrasco-Casado, K. Shiratama, P. Trinh, D. Kolev, F. Ishola, T. Fuse, H. Tsuji, M. Toyoshima
With the goal of meeting the diverse requirements of many different types of platforms, ranging from small drones to big satellites, and being applied in a variety of diverse scenarios, ranging from fixed terrestrial links to moving platforms in general, and operating within a wide range of conditions and distances, the Japanese National Institute of Information and Communications Technology (NICT) is currently working towards the development of a series of versatile miniaturized free-space laser-communication terminals. By choosing the appropriate terminal configuration for any given scenario, the basic conditions of operations can be satisfied without the need of customization, and the adaptive design of the terminals can close the gap to achieve an optimum solution that meets the communication requirements. This paper presents NICT's current efforts regarding the development of this series of lasercom terminals and introduces the first prototypes developed for validation and test purposes.
{"title":"NICT's versatile miniaturized lasercom terminals for moving platforms","authors":"A. Carrasco-Casado, K. Shiratama, P. Trinh, D. Kolev, F. Ishola, T. Fuse, H. Tsuji, M. Toyoshima","doi":"10.1109/ICSOS53063.2022.9749711","DOIUrl":"https://doi.org/10.1109/ICSOS53063.2022.9749711","url":null,"abstract":"With the goal of meeting the diverse requirements of many different types of platforms, ranging from small drones to big satellites, and being applied in a variety of diverse scenarios, ranging from fixed terrestrial links to moving platforms in general, and operating within a wide range of conditions and distances, the Japanese National Institute of Information and Communications Technology (NICT) is currently working towards the development of a series of versatile miniaturized free-space laser-communication terminals. By choosing the appropriate terminal configuration for any given scenario, the basic conditions of operations can be satisfied without the need of customization, and the adaptive design of the terminals can close the gap to achieve an optimum solution that meets the communication requirements. This paper presents NICT's current efforts regarding the development of this series of lasercom terminals and introduces the first prototypes developed for validation and test purposes.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126687925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749726
S. Yamakawa, Yohei Satoh, T. Itahashi, Y. Takano, Shintaroh Hoshi, Y. Miyamoto, M. Sugiho, Takeshi Yoshizawa, Yusuke Koizumi, Masakazu Yukizane, Sota Suzuki, H. Kohata
After 13 years successful operation of Japanese first data relay satellite “KODAMA” (DRTS), JAXA launched a new data relay satellite which adopts optical inter-satellite communication technology in 2020 successfully. The first user satellite, named as ALOS-3 is planned to be launch in 2022 Japanese fiscal year. First demonstrations of optical data-relay satellite system are planned between these two satellites In this paper, the authors outline the plan of the program and its technology.
{"title":"LUCAS: The second-generation GEO satellite-based space data-relay system using optical link","authors":"S. Yamakawa, Yohei Satoh, T. Itahashi, Y. Takano, Shintaroh Hoshi, Y. Miyamoto, M. Sugiho, Takeshi Yoshizawa, Yusuke Koizumi, Masakazu Yukizane, Sota Suzuki, H. Kohata","doi":"10.1109/icsos53063.2022.9749726","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749726","url":null,"abstract":"After 13 years successful operation of Japanese first data relay satellite “KODAMA” (DRTS), JAXA launched a new data relay satellite which adopts optical inter-satellite communication technology in 2020 successfully. The first user satellite, named as ALOS-3 is planned to be launch in 2022 Japanese fiscal year. First demonstrations of optical data-relay satellite system are planned between these two satellites In this paper, the authors outline the plan of the program and its technology.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130578804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749731
T. Araki, H. Kotake, Y. Saito, H. Tsuji, M. Toyoshima, K. Makino, Masaru Koga, Naoki Sato
The ARTEMIS program aims to explore Mars and the Moon through international cooperation [1]. Japan is improving high-speed data transmission between the Moon and the Earth. The target of the data rate is 1 Gbps. Conventional RF technology cannot achieve this target. It is expected that bidirectional transmission that can deliver a massive volume of data will be needed after the 2030s. Under various scenarios, JAXA and NICT have started joint research. This paper reports on their preliminary study of Moon-to-Earth optical communication systems. Several technical issues and our R&D plans are discussed. We hope this paper encourages the standardization and partnerships for these optical data links between the Moon and Earth.
{"title":"Recent R&D activities of the Lunar – the Earth Optical Communication Systems in Japan","authors":"T. Araki, H. Kotake, Y. Saito, H. Tsuji, M. Toyoshima, K. Makino, Masaru Koga, Naoki Sato","doi":"10.1109/icsos53063.2022.9749731","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749731","url":null,"abstract":"The ARTEMIS program aims to explore Mars and the Moon through international cooperation [1]. Japan is improving high-speed data transmission between the Moon and the Earth. The target of the data rate is 1 Gbps. Conventional RF technology cannot achieve this target. It is expected that bidirectional transmission that can deliver a massive volume of data will be needed after the 2030s. Under various scenarios, JAXA and NICT have started joint research. This paper reports on their preliminary study of Moon-to-Earth optical communication systems. Several technical issues and our R&D plans are discussed. We hope this paper encourages the standardization and partnerships for these optical data links between the Moon and Earth.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125018350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749738
Ryuichi Hirayama, S. Nakasuka
This study focuses on the maximum angular velocity of the tracking gimbal, which can be one of the constraints for inter-satellite optical communication crosslinks between two intersecting orbits in a constellation. The angular constraint is due to the limits of both the tracking gimbal movement and the establishment of laser links. The torque caused by the angular acceleration of the gimbal can have little effect on the attitude control of the entire satellite. General formula and analysis for the azimuth and elevation gimbal angles in the satellite body-fixed coordinates system, including the case between rapid passing two orbits, have been shown in this study. Sensitivity analysis for various orbital phase and altitude differences is performed for some values. When the optical link vector passes near the zenith direction of the 2-axis gimbal, the angular velocity of the azimuth or elevation angle may increase beyond the constraint value. For avoiding this problem, it is necessary to set the phase difference between the satellites in both orbits. The margin of the altitude difference between both orbits can also mitigate the peak of rapid angular changes when they cross.
{"title":"Analysis of Tracking Gimbal Angles for Inter-Satellite Optical Communication System Between Two Orbits","authors":"Ryuichi Hirayama, S. Nakasuka","doi":"10.1109/icsos53063.2022.9749738","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749738","url":null,"abstract":"This study focuses on the maximum angular velocity of the tracking gimbal, which can be one of the constraints for inter-satellite optical communication crosslinks between two intersecting orbits in a constellation. The angular constraint is due to the limits of both the tracking gimbal movement and the establishment of laser links. The torque caused by the angular acceleration of the gimbal can have little effect on the attitude control of the entire satellite. General formula and analysis for the azimuth and elevation gimbal angles in the satellite body-fixed coordinates system, including the case between rapid passing two orbits, have been shown in this study. Sensitivity analysis for various orbital phase and altitude differences is performed for some values. When the optical link vector passes near the zenith direction of the 2-axis gimbal, the angular velocity of the azimuth or elevation angle may increase beyond the constraint value. For avoiding this problem, it is necessary to set the phase difference between the satellites in both orbits. The margin of the altitude difference between both orbits can also mitigate the peak of rapid angular changes when they cross.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131275910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749718
A. Thieu, Lulu Liu
The AMS Beacon is a ½-U laser guidestar payload, scheduled to launch in April 2022 aboard the Agile MicroSat (AMS) 6-U CubeSat. This payload, carrying $a$ 500 mW, 976 nm laser, will be the first to provide an active lasing low Earth orbit reference for high-angle rate adaptive optics (AO). During the science phase of the mission, it will establish a space-to-ground link with an AO-equipped ground station. Due to budget constraints and size, weight, and power (SWaP) limitations, AMS Beacon was designed without gimbals or fast-steering mirrors, to utilize only open-loop body-pointing and generic CubeSat attitude control software. This paper presents the radiometric link analysis that informed our selection of compatible ground station components and fed into the development of an on-orbit search scan pointing re-characterization procedure to mitigate pointing risks. Within the limits of our attitude determination and control system (ADCS), our search mode can accommodate up to 1.75° of pointing error during a single pass, and has the capability to potentially search larger areas by concatenating data from multiple successive passes. As our expected pointing error is approximately 0.1°, this search mode is a fail-safe in case of larger than expected pointing shifts during launch and deployment. Our scheme utilizes AMS's body-pointing capability, AMS telemetry, and ground-based radiometric readings to recover and re-characterize beam alignment knowledge on-orbit. Because this procedure relies on standard CubeSat pointing capabilities and telemetry, we believe that our procedure could be used for future laser guidestar CubeSat payloads.
{"title":"On-Orbit Risk Mitigation for a ½-U Orbital Laser Guidestar Link","authors":"A. Thieu, Lulu Liu","doi":"10.1109/icsos53063.2022.9749718","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749718","url":null,"abstract":"The AMS Beacon is a ½-U laser guidestar payload, scheduled to launch in April 2022 aboard the Agile MicroSat (AMS) 6-U CubeSat. This payload, carrying $a$ 500 mW, 976 nm laser, will be the first to provide an active lasing low Earth orbit reference for high-angle rate adaptive optics (AO). During the science phase of the mission, it will establish a space-to-ground link with an AO-equipped ground station. Due to budget constraints and size, weight, and power (SWaP) limitations, AMS Beacon was designed without gimbals or fast-steering mirrors, to utilize only open-loop body-pointing and generic CubeSat attitude control software. This paper presents the radiometric link analysis that informed our selection of compatible ground station components and fed into the development of an on-orbit search scan pointing re-characterization procedure to mitigate pointing risks. Within the limits of our attitude determination and control system (ADCS), our search mode can accommodate up to 1.75° of pointing error during a single pass, and has the capability to potentially search larger areas by concatenating data from multiple successive passes. As our expected pointing error is approximately 0.1°, this search mode is a fail-safe in case of larger than expected pointing shifts during launch and deployment. Our scheme utilizes AMS's body-pointing capability, AMS telemetry, and ground-based radiometric readings to recover and re-characterize beam alignment knowledge on-orbit. Because this procedure relies on standard CubeSat pointing capabilities and telemetry, we believe that our procedure could be used for future laser guidestar CubeSat payloads.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132614182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749741
D. Kolev, K. Shiratama, A. Carrasco-Casado, Y. Saito, Y. Munemasa, Junichi Nakazono, P. Trinh, H. Kotake, H. Kunimori, T. Kubooka, T. Fuse, M. Toyoshima
National Institute of Information and Communications Technology (NICT) has initiated several R&D projects related to satellite laser communications. In this paper we present some of the recent activities in the field, including the development of the optical ground station for geostationary orbit satellite-to-ground optical feeder link experiments with High-speed Communication with Advanced Laser Instrument (HICALI) and the optical bench preliminary experiment results with stars, planets and international collaboration with the OSIRIS payload from the German Aerospace Center (DLR). Furthermore, we present two main fields for future research - deep learning implementation for cloud recognition for site-diversity technology, and space optical communications with Cubesats.
{"title":"Status Update on Laser Communication Activities in NICT","authors":"D. Kolev, K. Shiratama, A. Carrasco-Casado, Y. Saito, Y. Munemasa, Junichi Nakazono, P. Trinh, H. Kotake, H. Kunimori, T. Kubooka, T. Fuse, M. Toyoshima","doi":"10.1109/icsos53063.2022.9749741","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749741","url":null,"abstract":"National Institute of Information and Communications Technology (NICT) has initiated several R&D projects related to satellite laser communications. In this paper we present some of the recent activities in the field, including the development of the optical ground station for geostationary orbit satellite-to-ground optical feeder link experiments with High-speed Communication with Advanced Laser Instrument (HICALI) and the optical bench preliminary experiment results with stars, planets and international collaboration with the OSIRIS payload from the German Aerospace Center (DLR). Furthermore, we present two main fields for future research - deep learning implementation for cloud recognition for site-diversity technology, and space optical communications with Cubesats.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134360486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749712
Z. Sodnik, D. Miklusis, H. Smit, H. Hauschildt, E. Xilouris, Panayotis Hantzios, J. Alikakos, A. Gourzelas, Athanasios Maroussis, S. Basilakos, M. Plionis
Via the Greek participation in ESA's Strategic Programme Line for Optical and Quantum Communication - ScyLight, the Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, which is part of the National Observatory of Athens (NOA) made its 2.3 m Aristarchos telescope of the Chelmos observatory available for experiments on Optical/Quantum and Deep-Space Communication. This paper describes the tests performed with Alphasat and outlines the optical communication equipment installations to convert the Chelmos observatory into an optical ground station (OGS). This is performed in view of ESA's High thRoughput Optical Network (HydRON) project and the European Quantum Communication Initiative (EuroQCI), in which two more Greek observatories (Skinakas on Crete and Cholomondas near Thessaloniki) will participate.
{"title":"Greek Chelmos Observatory readies for Optical and Quantum Communication","authors":"Z. Sodnik, D. Miklusis, H. Smit, H. Hauschildt, E. Xilouris, Panayotis Hantzios, J. Alikakos, A. Gourzelas, Athanasios Maroussis, S. Basilakos, M. Plionis","doi":"10.1109/icsos53063.2022.9749712","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749712","url":null,"abstract":"Via the Greek participation in ESA's Strategic Programme Line for Optical and Quantum Communication - ScyLight, the Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, which is part of the National Observatory of Athens (NOA) made its 2.3 m Aristarchos telescope of the Chelmos observatory available for experiments on Optical/Quantum and Deep-Space Communication. This paper describes the tests performed with Alphasat and outlines the optical communication equipment installations to convert the Chelmos observatory into an optical ground station (OGS). This is performed in view of ESA's High thRoughput Optical Network (HydRON) project and the European Quantum Communication Initiative (EuroQCI), in which two more Greek observatories (Skinakas on Crete and Cholomondas near Thessaloniki) will participate.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114881929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rapid demand in global broadband requirements are driving advanced commercial Low Earth Orbit (LEO) satellite communications systems that can deliver global broadband capacity at terrestrial level costs and performance. Flight demonstration programs such as the Defense Advanced Research Projects Agency (DARPA) “Blackjack” program are exploring the utility of Optical Inter-Satellite Links (OISLs) for these new LEO systems. For global communications, LEO systems, such as that being developed by Telesat, provide unprecedented broadband capabilities. In addition, Telesat's new LEO system, Lightspeed™ represents very low latency communications, fiber-like mesh connectivity via OISLs increasing the capabilities for data dissemination and delivery across the globe. The ability for a User Terminal (UT) to reach back without the need for anchor relay stations through multiple OISL hops between communication satellites, provides secure and resilient connectivity. Unilateral global (including high latitude polar) connectivity, at fiber like speeds, provides a dramatic change to high-capacity data distribution and dissemination while delivering robust reliable and trusted information. The purpose of this paper is to provide an architectural overview of the Lightspeed mesh network interfaces as spacecraft-to-spacecraft (via OISL) relay data between spacecraft, ground stations, satellite operations center, and network operations center concepts. The mesh connectivity created by Telesat's Lightspeed network enables managed data service flexibility and should be considered as an important step in interleaving optical communication space systems within the Lightspeed commercial constellation. Additionally, Lightspeed introduces an incremental constellation construct of polar and inclined shells that can integrate and manage various capabilities to deliver key network metrics, prioritizations, performance, at Gbps data rates. We identify and address challenges associated with operating OISLs within Lightspeed's mesh network, to include acquisition, tracking, tasking, efficient data routing, and managing network data. Lastly, we present enabling standards and technologies that enhance network flexibility, inter-operability and identify areas of future capability development.
{"title":"Telesat Lightspeed™- Enabling Mesh Network Solutions for Managed Data Service Flexibility Across the Globe","authors":"G. Jansson","doi":"10.1117/12.2646211","DOIUrl":"https://doi.org/10.1117/12.2646211","url":null,"abstract":"Rapid demand in global broadband requirements are driving advanced commercial Low Earth Orbit (LEO) satellite communications systems that can deliver global broadband capacity at terrestrial level costs and performance. Flight demonstration programs such as the Defense Advanced Research Projects Agency (DARPA) “Blackjack” program are exploring the utility of Optical Inter-Satellite Links (OISLs) for these new LEO systems. For global communications, LEO systems, such as that being developed by Telesat, provide unprecedented broadband capabilities. In addition, Telesat's new LEO system, Lightspeed™ represents very low latency communications, fiber-like mesh connectivity via OISLs increasing the capabilities for data dissemination and delivery across the globe. The ability for a User Terminal (UT) to reach back without the need for anchor relay stations through multiple OISL hops between communication satellites, provides secure and resilient connectivity. Unilateral global (including high latitude polar) connectivity, at fiber like speeds, provides a dramatic change to high-capacity data distribution and dissemination while delivering robust reliable and trusted information. The purpose of this paper is to provide an architectural overview of the Lightspeed mesh network interfaces as spacecraft-to-spacecraft (via OISL) relay data between spacecraft, ground stations, satellite operations center, and network operations center concepts. The mesh connectivity created by Telesat's Lightspeed network enables managed data service flexibility and should be considered as an important step in interleaving optical communication space systems within the Lightspeed commercial constellation. Additionally, Lightspeed introduces an incremental constellation construct of polar and inclined shells that can integrate and manage various capabilities to deliver key network metrics, prioritizations, performance, at Gbps data rates. We identify and address challenges associated with operating OISLs within Lightspeed's mesh network, to include acquisition, tracking, tasking, efficient data routing, and managing network data. Lastly, we present enabling standards and technologies that enhance network flexibility, inter-operability and identify areas of future capability development.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122654225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749710
A. Billaud, Andrew Reeves, A. Orieux, Helawae Friew, F. Gomez, Stephane Bernard, T. Michel, D. Allioux, J. Poliak, R. M. Calvo, O. Pinel
Current LEO satellites are generating more and more data which needs to be brought back to Earth for processing and analysis. Robust optical communications links are compulsory to be able to follow this growing demand for high-speed downlink with targets ranging from 10Gbps to 1Tbps. Atmospheric turbulences compensation is a key element to achieve such throughput. Here we investigate the capacity of turbulence mitigation via the use of a MPLC followed by an active optical recombiner, also called Tilba-Atmo. The MPLC demultiplexes the incoming turbulent beam into a set of gaussians beams whose relative energy distribution and relative phase evolves according to turbulence fluctuations. These gaussians are then sent into an active system based on a photonic integrated chip where the channels are optically recombined two-by-two in separate Mach-Zehnder interferometers. An 8-HGmode MPLC was placed at the reception end of a free space optical link in C or L-band. Different configurations where tried such as different levels of turbulence. Two different link lengths were tested, a 200m link with a 20cm telescope and a 10 km link at the DLR with a 10cm telescope which is normally use for testing and developing adaptive optics solutions. The first link showed high level of phase degradation on the received beam whilst on the second link the main effect of atmospheric turbulence was scintillation inside the pupil. In both cases tip-tilt was compensated via an auxiliary system and was not implemented inside the Tilba-Atmo component. The results are focused on comparison of fading in CW condition and in OOK communication between an SMF channel and the Tilba-Atmo channel. As this first version Tilba-Atmo is contributing to optical losses and optical recombining might be limited by the control electronics, a numerical sum of the demultiplexed modes is also performed to determine the upper limits of such a system.
{"title":"Turbulence Mitigation via Multi-Plane Light Conversion and Coherent Optical Combination on a 200 m and a 10 km Link","authors":"A. Billaud, Andrew Reeves, A. Orieux, Helawae Friew, F. Gomez, Stephane Bernard, T. Michel, D. Allioux, J. Poliak, R. M. Calvo, O. Pinel","doi":"10.1109/icsos53063.2022.9749710","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749710","url":null,"abstract":"Current LEO satellites are generating more and more data which needs to be brought back to Earth for processing and analysis. Robust optical communications links are compulsory to be able to follow this growing demand for high-speed downlink with targets ranging from 10Gbps to 1Tbps. Atmospheric turbulences compensation is a key element to achieve such throughput. Here we investigate the capacity of turbulence mitigation via the use of a MPLC followed by an active optical recombiner, also called Tilba-Atmo. The MPLC demultiplexes the incoming turbulent beam into a set of gaussians beams whose relative energy distribution and relative phase evolves according to turbulence fluctuations. These gaussians are then sent into an active system based on a photonic integrated chip where the channels are optically recombined two-by-two in separate Mach-Zehnder interferometers. An 8-HGmode MPLC was placed at the reception end of a free space optical link in C or L-band. Different configurations where tried such as different levels of turbulence. Two different link lengths were tested, a 200m link with a 20cm telescope and a 10 km link at the DLR with a 10cm telescope which is normally use for testing and developing adaptive optics solutions. The first link showed high level of phase degradation on the received beam whilst on the second link the main effect of atmospheric turbulence was scintillation inside the pupil. In both cases tip-tilt was compensated via an auxiliary system and was not implemented inside the Tilba-Atmo component. The results are focused on comparison of fading in CW condition and in OOK communication between an SMF channel and the Tilba-Atmo channel. As this first version Tilba-Atmo is contributing to optical losses and optical recombining might be limited by the control electronics, a numerical sum of the demultiplexed modes is also performed to determine the upper limits of such a system.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133370671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749730
B. Edwards, Trisha Randazzo, Nidhin Suresh Babu, Kendall Murphy, S. Albright, N. Cummings, Javier Ocasio-Perez, W. Potter, Russell Roder, Sharon A. Zehner, Ricardo Salah, Joan C. Woodward
The Laser Communications Relay Demonstration (LCRD) is a space flight technology demonstration mission, led by the National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC) in Greenbelt, Maryland and sponsored by NASA's Technology Demonstration Missions (TDM) Program and Space Communications and Navigation (SCaN) Program Office. The LCRD payload is hosted on the Department of Defense (DoD) Space Test Program (STP) Satellite-6 (STPSat-6) space vehicle and will operate in geostationary orbit (GEO). Launching in late 2021, the mission will conduct a minimum of two years of communication experiments with optical terminals at NASA's Jet Propulsion Laboratory (JPL) Table Mountain Facility, in Hawaii, on the International Space Station in LEO, and via a high bandwidth radio link to White Sands Complex (WSC), New Mexico. This paper focuses on the assembly, integration, and test (AI&T) campaign spanning more than four years, using multiple test facilities, and involving multiple partner collaborations.
{"title":"Challenges, Lessons Learned, and Methodologies from the LCRD Optical Communication System AI&T","authors":"B. Edwards, Trisha Randazzo, Nidhin Suresh Babu, Kendall Murphy, S. Albright, N. Cummings, Javier Ocasio-Perez, W. Potter, Russell Roder, Sharon A. Zehner, Ricardo Salah, Joan C. Woodward","doi":"10.1109/icsos53063.2022.9749730","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749730","url":null,"abstract":"The Laser Communications Relay Demonstration (LCRD) is a space flight technology demonstration mission, led by the National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC) in Greenbelt, Maryland and sponsored by NASA's Technology Demonstration Missions (TDM) Program and Space Communications and Navigation (SCaN) Program Office. The LCRD payload is hosted on the Department of Defense (DoD) Space Test Program (STP) Satellite-6 (STPSat-6) space vehicle and will operate in geostationary orbit (GEO). Launching in late 2021, the mission will conduct a minimum of two years of communication experiments with optical terminals at NASA's Jet Propulsion Laboratory (JPL) Table Mountain Facility, in Hawaii, on the International Space Station in LEO, and via a high bandwidth radio link to White Sands Complex (WSC), New Mexico. This paper focuses on the assembly, integration, and test (AI&T) campaign spanning more than four years, using multiple test facilities, and involving multiple partner collaborations.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132038593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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