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Power and Scintillation measurements with Avalanche Photodetectors

Lippert, Florian (2022) Power and Scintillation measurements with Avalanche Photodetectors. Bachelorarbeit, Munich University of Applied Sciences.

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Kurzfassung

Avalanche photodiode based optical receiver frontends outreach the sensitivity of positive intrinsic negative photodiode receivers and are a key element in free space optical communication. Satellite downlinks are impacted by atmospheric index of refraction turbulence induced fluctuations of signal power and thus must be precisely monitored in order to deploy appropriate countermeasures. Previous methods of power and scintillation monitoring excluded the capabilities of the receiver frontend. The photocurrent is a function of the avalanche multiplication factor M and has a non-linear relation to received optical power. A deviation of received optical power from photodiode current and temperature is presented. The diode’s temperature coefficient is determined and a calculation of the current multiplication factor is implemented. Sensitivity measurements of a receiver frontend for 10 Gbit s−1 verify the found parameters. Optical input power is determined based on direct monitoring of the photodiode current with a high-side current monitor and a power sensor, measuring the output amplitude of the transimpedance amplifier. Results of the power sensor validate the implementations. Synthetic generated power vectors with fixed power scintillation index are used to be measured by the received signal strength indication output of the receiver frontend’s limiting amplifier and the power sensor. The determined power scintillation indices overall match the expectations and show particularly good accuracy when using the power sensor.

elib-URL des Eintrags:https://elib.dlr.de/193869/
Dokumentart:Hochschulschrift (Bachelorarbeit)
Zusätzliche Informationen:Betreuer: Dr. Dirk Giggenbach
Titel:Power and Scintillation measurements with Avalanche Photodetectors
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Lippert, FlorianFlorian.Lippert (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:Dezember 2022
Referierte Publikation:Nein
Open Access:Nein
Seitenanzahl:61
Status:veröffentlicht
Stichwörter:Avalanche photodiode, free space optical communication, optical receiver frontends, power scintillation, LEO downlink, Atmospheric scintillation, KNOCGOP
Institution:Munich University of Applied Sciences
Abteilung:Department of Electrical Engineering and Information Technology
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R - keine Zuordnung
DLR - Teilgebiet (Projekt, Vorhaben):R - keine Zuordnung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Kommunikation und Navigation > Optische Satellitenlinks
Hinterlegt von: Lang, Manuela
Hinterlegt am:13 Feb 2023 17:29
Letzte Änderung:13 Feb 2023 17:29

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