HydRON: High throughput optical network

Hauschildt, Harald; Elia, C.; Moeller, Hermann Ludwig; El-Dali, Wael; Navarro, Tomás Gómez; Guta, Maria; Mezzasoma, Silvia; Perdigués, J.

doi:10.1117/12.2511391

Cited by 14 publications

(13 citation statements)

References 3 publications

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“…It will utilize all-optical payloads interconnected via Tbps optical inter-satellite links to realize a true "Fiber in the Sky" network. The HydRON system is expected to have the following main functionalities: bidirectional very high-capacity laser inter-satellite links and reliable very high-capacity optical feeder links; interface compatibility with RF/optical customer payloads for traffic distribution/collection to/from these payloads; on-board fast transparent optical switching and on-board fast regenerative electrical switching; and network optimization using artificial intelligence [19].…”

Section: Motivationmentioning

confidence: 99%

When to Crossover From Earth to Space for Lower Latency Data Communications?

Chaudhry

Yanıkömeroğlu

2022

IEEE Trans. Aerosp. Electron. Syst.

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For data communications over long distances, optical wireless satellite networks (OWSNs) can offer lower latency than optical fiber terrestrial networks (OFTNs). However, when is it beneficial to switch or crossover from an OFTN to an OWSN for lower latency data communications? In this work, we introduce a crossover function that enables to find the crossover distance, i.e., a distance between two points on the surface of the Earth beyond which switching or crossing over from an OFTN to an OWSN for data communications between these points is useful in terms of latency. Numerical results reveal that a higher refractive index of optical fiber (or 𝑖) in an OFTN and a lower altitude of satellites (or ℎ) in an OWSN result in a shorter crossover distance. To account for the variation in the end-to-end propagation distance that occurs over the OWSN, we examine the crossover function in four different scenarios. Numerical results indicate that the crossover distance varies with the end-to-end propagation distance over an OWSN and is different for different scenarios. We calculate the average crossover distance over all scenarios for different ℎ and 𝑖 and use it to evaluate the simulation results. Furthermore, for a comparative analysis of OFTNs and OWSNs in terms of latency, we study three different OFTNs having different refractive indices and three different OWSNs having different satellite altitudes in three different scenarios for long-distance intercontinental data communications, including connections between New York and Dublin, Sao Paulo and London, and Toronto and Sydney. All three OWSNs offer better latency than OFTN2 (with 𝑖 2 = 1.3) and OFTN3 (with 𝑖 3 = 1.4675) in all scenarios. For example, for Toronto-Sydney connection, OWSN1 (with ℎ 1 = 300 km), OWSN2 (with ℎ 2 = 550 km) and OWSN3 (with ℎ 3 = 1,100 km) perform better than OFTN2 by 18.11%, 16.08%, and 10.30%, respectively, while they provide an improvement in latency of 27.46%, 25.67%, and 20.54%, respectively, compared to OFTN3. The OWSN1 performs better than OFTN1 (with 𝑖 1 = 1.1) for Sao Paulo-London and Toronto-Sydney connections by 2.23% and 3.22%, respectively, while OWSN2 outperforms OFTN1 for Toronto-Sydney connection by 0.82%. For New York-Dublin connection, all OWSNs while for Sao Paulo-London connection, OWSN2 and OWSN3 exhibit higher latency than OFTN1 as the corresponding average crossover distances are greater than the shortest terrestrial distances between cities in these scenarios. Multiple satellites (or laser inter-satellite links) on its shortest paths drive up the propagation distance to the extent that OWSN3 ends up with a higher latency than OFTN1 for the Toronto-Sydney inter-continental connection scenario although the related average crossover distance is less than the shortest terrestrial distance between Toronto and Sydney. The challenges related to OWSNs and OFTNs that may arise from this work in future are also highlighted.

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Section: Motivationmentioning

confidence: 99%

When to Crossover From Earth to Space for Lower Latency Data Communications?

Chaudhry

Yanıkömeroğlu

2022

IEEE Trans. Aerosp. Electron. Syst.

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“…The European Data Relay System (EDRS) 14 of ESA, under operation on orbit, equips a Laser Communication Terminal (LCE) using a 1064 nm Homodyne system for 1.8 Gbps user data transmission (a 2.8125 Gbps channel rate), with a much higher data rate in the planning. 15,16 PSK will meet the requirements for transmitting a 2.5 or 5 Gbps channel rate from the Moon.…”

Section: Preliminary Study Of Lunar-earth Optical Communications Linkmentioning

confidence: 99%

“…Especially, low-rate has not be demonstrated even in the laboratory. The coherent digital receiver should also have a high-performance forward error correction code (FEC) like DVB-S2 16,17 . These technologies are not mature under space environment (TLR=3), so further investigation and development will be needed.…”

Section: Virtual Conference 30 March-2 April 2021mentioning

confidence: 99%

A trade-off study of lunar-earth optical communication links

Araki

2021

International Conference on Space Optics — ICSO 2020

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A new era of manned lunar exploration is dawning. Optical communication technology is expected to become indispensable for high-speed data transmission from lunar explorers to the Earth. This paper describes the expectations for contents from the Moon and the estimated amount of information. Then, two types of Lunar-Earth optical communication systems are discussed, including a comparison between direct communication with an optical ground station (OGS) and communication through a data relay satellite in geostationary orbit (GEO) around the Earth.

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“…Future optical feeder link satellites networks [4,5] will require a more reliable approach to cope with atmospheric distortions occurring during OFL. An alternative consists in using the Laser Guide Stars (LGS) approach, a key technology of AO used in astronomy, to create an artificial beacon in the desired line of sight [6][7][8].…”

Section: Virtual Conference 30 March-2 April 2021mentioning

confidence: 99%

Paving the way to daytime optical feeder links based on LGS assisted adaptive optics

Alaluf

Centrone

Calia³

et al. 2021

International Conference on Space Optics — ICSO 2020

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We report on experiments performed with the Swedish Solar Telescope (SST) located in La Palma (Canary Islands) to observe the sodium Laser Guide Star (LGS) during daytime. The ESO Wendelstein Laser Guide Star Unit 20W CW 589nm laser was used to generate an LGS plume at Earth's Mesosphere, the laser launch telescope being at a distance of 92m from the SST, where a special daytime receiver was installed. The photometry of the LGS plume and the background effects were measured as a function of the angular separation between the plume and the Sun. The ultimate goal is to demonstrate closed-loop LGS Adaptive Optics (AO) during daytime, for Optical Feeder Satellite Communications operating 24/7, as well as for astrophysics of the Sun Coronal Mass Ejections. Other applications of daytime LGS-AO are for thermal imaging of astrophysical objects. This paper presents several system aspects of the daytime LGS-AO setup and discusses the experimental results obtained. We conclude that using an ultra-narrow band magneto-optical filter installed in the daytime SST receiver, the sky background flux is very efficiently suppressed and the LGS flux is well sufficient to drive LGS-AO during daytime for correction at visible wavelengths.

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HydRON: High throughput optical network

Cited by 14 publications

References 3 publications

When to Crossover From Earth to Space for Lower Latency Data Communications?

When to Crossover From Earth to Space for Lower Latency Data Communications?

A trade-off study of lunar-earth optical communication links

Paving the way to daytime optical feeder links based on LGS assisted adaptive optics

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