elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Fading testbed for free space optical communications

Shrestha, Amita and Giggenbach, Dirk and Ramírez, Julio and Pacheco, Jorge and Rein, Fabian (2016) Fading testbed for free space optical communications. In: Proc. SPIE 9991, Advanced Free-space Optical Communication Techniques and Applicatons II, 9991, pp. 999105-1. SPIE Security + Defense 2016, 26-29 September 2016, Edinburgh, United Kingdom. DOI: 10.1117/12.2239111

[img] PDF
408kB

Official URL: http://spiedigitallibrary.org

Abstract

Free-space optical (FSO) communication is a very attractive technology offering very high throughput without spectral regulation constraints, yet allowing small antennas (telescopes) and tap-proof communication. However, the transmitted signal has to travel through the atmosphere where it gets influenced by atmospheric turbulence, causing scintillation of the received signal. In addition, climatic effects like fogs, clouds and rain also affect the signal significantly. Moreover, FSO being a line of sight communication requires precise pointing and tracking of the telescopes, which otherwise also causes fading. To achieve error-free transmission, various mitigation techniques like aperture averaging, adaptive optics, transmitter diversity, sophisticated coding and modulation schemes are being investigated and implemented. Evaluating the performance of such systems under controlled conditions is very difficult in field trials since the atmospheric situation constantly changes, and the target scenario (e.g. on aircraft or satellites) is not easily accessible for test purposes. Therefore, with the motivation to be able to test and verify a system under laboratory conditions, DLR has developed a fading testbed that can emulate most realistic channel conditions. The main principle of the fading testbed is to control the input current of a variable optical attenuator such that it attenuates the incoming signal according to the loaded power vector. The sampling frequency and mean power of the vector can be optionally changed according to requirements. This paper provides a brief introduction to software and hardware development of the fading testbed and measurement results showing its accuracy and application scenarios.

Item URL in elib:https://elib.dlr.de/107389/
Document Type:Conference or Workshop Item (Speech)
Title:Fading testbed for free space optical communications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Shrestha, AmitaAmita.Shrestha (at) dlr.deUNSPECIFIED
Giggenbach, DirkDirk.Giggenbach (at) dlr.deUNSPECIFIED
Ramírez, Juliojulio.ramirez (at) dlr.deUNSPECIFIED
Pacheco, JorgeJorge.Pacheco (at) dlr.deUNSPECIFIED
Rein, Fabianfabian.rein (at) dlr.deUNSPECIFIED
Date:21 October 2016
Journal or Publication Title:Proc. SPIE 9991, Advanced Free-space Optical Communication Techniques and Applicatons II
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:9991
DOI :10.1117/12.2239111
Page Range:pp. 999105-1
Status:Published
Keywords:KNOCGOP, FSO, Optical Communication, Laser Communication, Fading emulator, testbed
Event Title:SPIE Security + Defense 2016
Event Location:Edinburgh, United Kingdom
Event Type:international Conference
Event Dates:26-29 September 2016
Organizer:SPIE
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Communication, Navigation and Surveillance
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Satellite Networks
Deposited By: Shrestha, Amita
Deposited On:14 Nov 2016 14:17
Last Modified:31 Jul 2019 20:04

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.