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Development of a cascaded fine pointing and tracking control loop for quantum key distribution via free-space optical communications

Rüddenklau, René und Peev, Eltimir und Moll, Florian (2022) Development of a cascaded fine pointing and tracking control loop for quantum key distribution via free-space optical communications. In: Environmental Effects on Light Propagation and Adaptive Systems V 2022 (12266). SPIE. Proceedings Volume 12266, Environmental Effects on Light Propagation and Adaptive Systems V, 2022-09-05 - 2022-09-07, Berlin, Deutschland. doi: 10.1117/12.2636111. ISBN 978-151065535-5. ISSN 0277-786X.

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Kurzfassung

Satellite based quantum key distribution (QKD) enables the delivery of keys for quantum secure communications over long distances. Maturity of the technology as well as industrial interest are ever increasing. Same is true for satellite free-space optical communications (FSOC). In order to enable a robust channel for transmission it is indispensable to account for static and dynamically changing misalignments between the transmitter and receiver pair. This work will focus on the transmitter terminal (Alice) and the design and verification process of the active beam steering system. The novelty is a recently developed variable reluctance fine steering mirror (FSM) including eddy current sensors (ECS) to measure its tip and tilt. A cascaded architecture was chosen in order to combine the optical stabilization objective with the dynamics of the mirror platform. The inner control loop makes use of an observer model whose estimated output is fed into a state controller allowing for an increased responsiveness. While high gains increase the closed loop bandwidth the eigenfrequency of the system introduces a pole to the plant which has to be avoided by the controller output. A digital notch filter was introduced to reject the excitation of the critical frequency band which gets obsolete in a system with high frequency sampling capabilities. The outer loop is engaged when a valid optical signal is received and a transition from a closed loop pointing to a closed loop tracking mode is performed. A proportional-integral (PI) controller keeps the received beam at the 4-quadrant-diode (4QD) whose center is used as the main reference through prior calibration with the transmit beam launching on the same path. The presented cascaded control scheme allows improvements in system performance and reliability.

elib-URL des Eintrags:https://elib.dlr.de/187959/
Dokumentart:Konferenzbeitrag (Vortrag)
Zusätzliche Informationen:The project on which this report is based was funded by the German Federal Ministry of Education and Research under the funding code 16KIS1079. The author is responsible for the content of this publication.
Titel:Development of a cascaded fine pointing and tracking control loop for quantum key distribution via free-space optical communications
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Rüddenklau, RenéRene.Rueddenklau (at) dlr.dehttps://orcid.org/0000-0003-2876-8591NICHT SPEZIFIZIERT
Peev, EltimirEltimir.Peev (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Moll, FlorianFlorian.Moll (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:22 Oktober 2022
Erschienen in:Environmental Effects on Light Propagation and Adaptive Systems V 2022
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.1117/12.2636111
Verlag:SPIE
Name der Reihe:Proceedings of SPIE
ISSN:0277-786X
ISBN:978-151065535-5
Status:veröffentlicht
Stichwörter:free-space optical communications, tracking, fine pointing, cascaded control loop, fine steering mirror, quantum key distribution
Veranstaltungstitel:Proceedings Volume 12266, Environmental Effects on Light Propagation and Adaptive Systems V
Veranstaltungsort:Berlin, Deutschland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:5 September 2022
Veranstaltungsende:7 September 2022
Veranstalter :SPIE
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Kommunikation, Navigation, Quantentechnologien
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R KNQ - Kommunikation, Navigation, Quantentechnologie
DLR - Teilgebiet (Projekt, Vorhaben):R - Project PROSIRIS
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Kommunikation und Navigation > Optische Satellitenlinks
Hinterlegt von: Rüddenklau, René
Hinterlegt am:09 Nov 2022 15:25
Letzte Änderung:24 Apr 2024 20:49

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