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Independent Component Analysis for Preprocessing Optical Signals in Support of Multi-User CommunicationIn an effort to construct an optical transceiver for supporting multi-point communication, researchers developed large field-of-view FSO transceivers with wide apertures for facilitating rapid acquisition and optical signal tracking. The design is constructed from fiber-bundle(s) intelligently arranged to provide multiple optical pathways within a single transceiver, with each pathway limited to a particular optical directionality. Because designs with wide apertures are susceptible to receiving several optical signals simultaneously from multiple transmitters, accurately decoding individual signals and achieving true multi-user communication can be difficult. The work detailed in this paper investigated the use of blind source separation techniques, mainly independent component analysis (ICA), to estimate transmitted signals from their observed, combined mixtures sans information. Effects of signal power, format, data rate, wavelength, and turbulence severity on signal separation, as well as signal demodulation accuracy was also analyzed using experimental optical signals and corresponding mixtures. Signal generators, laser sources, turbulence emulator, beam profiler, photodiodes, and oscilloscopes comprised the experiment setup. Optical signals with varying power, format, and wavelength were generated and propagated through turbulence with varying degree severity, and finally received by the fiber-bundle-based optical transceiver. Results demonstrate that an ICA technique can accurately process the combined signals into corresponding individual components. The investigation further identified signal characteristics (e.g., power levels, format, data rate) and turbulence severity under which ICA is unable to accurately perform signal separations.
Document ID
20180004685
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Aveta, Federica
(Oklahoma Univ. Norman, OK, United States)
Refai, Hazem H.
(Oklahoma Univ. Norman, OK, United States)
LoPresti, Peter
(Tulsa Univ. OK, United States)
Tedder, Sarah A.
(NASA Glenn Research Center Cleveland, OH, United States)
Schoenholz, Bryan L.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 27, 2018
Publication Date
January 27, 2018
Subject Category
Optics
Communications And Radar
Report/Patent Number
GRC-E-DAA-TN52055
Meeting Information
Meeting: SPIE Photonics West
Location: San Francisco, CA
Country: United States
Start Date: January 27, 2018
End Date: February 1, 2018
Sponsors: International Society for Optical Engineering
Funding Number(s)
WBS: WBS 405034.04.05.03.02
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Optics
Communications
Fibers
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