Mr. Benjamin Rödiger Profile

Benjamin Rödiger

at Deutsches Zentrum für Luft- und Raumfahrt e. V.

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Publications (5)

Proceedings Article | 11 June 2021 Open Access

Dual wavelength optical system for multiple quantum communication transmitters in Cubesat platform

Christian Menninger, Florian Moll, Benjamin Rödiger

Proceedings Volume 11852, 118525M (2021) https://doi.org/10.1117/12.2599965

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Quantum Key Distribution (QKD) systems will play an important role in future networks for secure data communication. In order to provide a global coverage of a future QKD service, satellites are needed to bridge large distances. These satellite systems must be cost efficient to facilitate deployment since many network nodes will be needed. The CubeSat standard is frequently used for New Space projects as a versatile platform for satellite payloads. It is also chosen as a baseline for the construction of the system described in this paper. The DLR Institute of Communications and Navigation develops optical free space communication systems for scientific research in classical and quantum communications. A previous development of a 1/3 U CubeSat communication terminal for up to 100 Mbit/s downlinks is adapted to be used for quantum communications tests with multiple transmitters. Since the original laser terminal was designed for C-band wavelengths, a redesign of the optical system is needed to achieve polychromatic performance for the three sources. The optical system consists of a fiber collimator, a beam steering system and an afocal telescope. Most important requirement of the latter is a similar magnification for all wavelengths to ensure concentric beams pointing to the OGS. Scenarios in which the system is optimized either for lowest divergences or a similar magnification of the telescope are demonstrated in Figure 1. As the afocal telescope is used bidirectionally, it also needs to be optimized for the incident wave-front of the beacon from the OGS with respect to the beam shape at the four quadrant detector. These parameters are important for a correct pointing control. A fiber-based wavelength division multiplexer (WDM) is used for combining signals from three sources into one output fiber. As shown in the block diagram in Figure 2, it is based on cascaded thin film interference filters which are coupled to the fibers. Especially the propagation of 850 nm and 1550 nm signals in one single mode fiber is critical. Therefore the types of optical fibers were selected with respect to the bend loss, single mode propagation behavior, polarization integrity and optimal cladding diameter for the production.

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Proceedings Article | 22 August 2020 Presentation + Paper

High data-rate optical communication payload for CubeSats

Benjamin Rödiger, Christian Menninger, Christian Fuchs, Lukas Grillmayer, Saskia Arnold, Christoph Rochow, Philipp Wertz, Christopher Schmidt

Proceedings Volume 11506, 1150604 (2020) https://doi.org/10.1117/12.2567035

KEYWORDS: Satellites, Optical communications, Space operations, Satellite communications, Commercial off the shelf technology, Interfaces, Telecommunications

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Proceedings Article | 22 August 2020 Presentation + Paper

Demonstration of an FSO/RF hybrid-communication system on aeronautical and space applications

Benjamin Rödiger, David Ginthör, Jorge Pacheco Labrador, Julio Ramirez, Christopher Schmidt, Christian Fuchs

Proceedings Volume 11506, 1150603 (2020) https://doi.org/10.1117/12.2567034

KEYWORDS: Free space optics, Error control coding, Telecommunications, Switching, Data communications, Optical communications, RF communications, Atmospheric optics

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Proceedings Article | 4 March 2019 Paper

Update on DLR's OSIRIS program and first results of OSIRISv1 on Flying Laptop

Christian Fuchs, Christopher Schmidt, Jonas Keim, Florian Moll, Benjamin Rödiger, Michael Lengowski, Steffen Gaißer, Dirk Giggenbach

Proceedings Volume 10910, 109100S (2019) https://doi.org/10.1117/12.2514349

KEYWORDS: Satellites, Satellite communications, Cameras, Collimators, Telecommunications, Optical tracking, Optical communications, Data communications, Optical amplifiers, Navigation systems

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Proceedings Article | 24 February 2017 Presentation + Paper

DLR's free space experimental laser terminal for optical aircraft downlinks

Christian Fuchs, Christopher Schmidt, Benjamin Rödiger, Amita Shrestha, Martin Brechtelsbauer, Julio Ramirez Molina, Jorge Pacheco, Veronika Gstaiger

Proceedings Volume 10096, 1009610 (2017) https://doi.org/10.1117/12.2254791

KEYWORDS: Free space optics, Free space, Laser optics, Laser communications, Telecommunications, Cameras, Forward error correction, Computing systems, Global Positioning System, Telescopes

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