Space Optical Links for Communication Networks

Carrasco‐Casado, Alberto; Calvo, Ramon Mata

doi:10.1007/978-3-030-16250-4_34

Cited by 38 publications

(17 citation statements)

References 82 publications

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“…Furthermore, 810 nm enables direct light coupling to the surface of the Si-APD, thus avoiding the use of fibre coupling that introduces losses at the additional optical interfaces. Here we do not consider the alternative of 1064 nm for the following reasons: it is not directly compatible with telecom technology, the wavelength is above the Si-APD cutoff, InGaAs (IGA) has a lower detection efficiency at 1064 nm than at 1550 nm (and a higher noise level than Si), and atmospheric transmission is lower at 1064 nm than at 1550 nm 51 . The comparison between the 810 nm and 1550 nm wavelength must be qualitatively investigated through numerical analysis.…”

Section: Resultsmentioning

confidence: 99%

Satellite-based quantum information networks: use cases, architecture, and roadmap

et al. 2023

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Quantum Information Networks (QINs) attract increasing interest, as they enable connecting quantum devices over long distances, thus greatly enhancing their intrinsic computing, sensing, and security capabilities. The core mechanism of a QIN is quantum state teleportation, consuming quantum entanglement, which can be seen in this context as a new kind of network resource. Here we identify use cases per activity sector, including key performance targets, as a reference for the network requirements. We then define a high-level architecture of a generic QIN, before focusing on the architecture of the Space segment, with the aim of identifying the main design drivers and critical elements. A survey of the state-of-the-art of these critical elements is presented, as are issues related to standardisation. Finally, we explain our roadmap to developing the first QINs and detail the already concluded first step, the design and numerical simulation of a Space-to-ground entanglement distribution demonstrator.

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Section: Resultsmentioning

confidence: 99%

Satellite-based quantum information networks: use cases, architecture, and roadmap

et al. 2023

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“…2. Typical responsivity w.r.t wavelength for Si, InGaAs, and Ge based image sensors (source from [13]).…”

Section: B From Light To Digital Imagesmentioning

confidence: 99%

Unconventional Visual Sensors for Autonomous Vehicles

Li¹,

Moreau²,

Ibañez‐Guzmán³

2022

Preprint

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Autonomous vehicles rely on perception systems to understand their surroundings for further navigation missions. Cameras are essential for perception systems due to the advantages of object detection and recognition provided by modern computer vision algorithms, comparing to other sensors, such as LiDARs and radars. However, limited by its inherent imaging principle, a standard RGB camera may perform poorly in a variety of adverse scenarios, including but not limited to: low illumination, high contrast, bad weather such as fog/rain/snow, etc. Meanwhile, estimating the 3D information from the 2D image detection is generally more difficult when compared to LiDARs or radars. Several new sensing technologies have emerged in recent years to address the limitations of conventional RGB cameras. In this paper, we review the principles of four novel image sensors: infrared cameras, range-gated cameras, polarization cameras, and event cameras. Their comparative advantages, existing or potential applications, and corresponding data processing algorithms are all presented in a systematic manner. We expect that this study will assist practitioners in the autonomous driving society with new perspectives and insights.

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“…The adoption of space-based lasercom is accelerating rapidly in the commercial, civil, and defense sectors [1][2][3][4] . Enabled by reductions in launch costs, proliferated LEO (pLEO) architectures offer tantalizing new capabilities, including both affordable, low-latency consumer satcom with global coverage, as well as resilient data transport for high-priority government missions.…”

Section: Introductionmentioning

confidence: 99%

Implementing and testing generalized pointing, acquisition, and tracking for a space-based adaptive communication node (Space-BACN)

Ulmer,

Reynolds,

Moores

et al. 2024

Free-Space Laser Communications XXXVI

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As lasercom transitions from individual demonstrations to wide-spread deployment, diverging standards and proprietary implementations will impede interoperability between terminals from different suppliers. In this environment, there is an urgent need for a universal lasercom translator terminal capable of supporting multiple acquisition sequences and communication waveforms in order to connect disparate networks. Development of such a generalized terminal is a key goal of the DARPA Space-Based Adaptive Communication Node (Space-BACN) program.Pointing, acquisition, and tracking (PAT) are crucial aspects of interoperability, and multiple styles of PAT sequences have emerged. Even within a given category of beacon generation (e.g., synthesized, in-band, out-of-band), multiple parameters must be specified to define specific entry/exit criteria for each PAT stage, requiring detailed pre-coordination to ensure that terminals from different suppliers can establish a link between them. In addition, extra hardware must be incorporated into the terminal design to accommodate a superset of PAT requirements. Finally, verification testing of multiple PAT sequences in a common testbed drives the testbed implementation requirements.Here, we examine the implications of attempting to accommodate a generalized PAT sequence with a single lasercom terminal. First, we consider the performance of different styles of PAT sequence, and the trades between pointing uncertainty, maximum acquisition range, and allowable scan time. Next, we consider potential hardware requirements for terminals that support multiple PAT sequences. Finally, we consider the testing of such a terminal, and present a testbed architecture intended to accommodate multiple PAT sequences by highly flexible emulation of the remote terminal PAT behavior.

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Space Optical Links for Communication Networks

Cited by 38 publications

References 82 publications

Satellite-based quantum information networks: use cases, architecture, and roadmap

Satellite-based quantum information networks: use cases, architecture, and roadmap

Unconventional Visual Sensors for Autonomous Vehicles

Implementing and testing generalized pointing, acquisition, and tracking for a space-based adaptive communication node (Space-BACN)

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