NDLI: 40-Gbps modem architecture for free-space optical communications

Content Provider	IEEE Xplore Digital Library
Author	Juarez, J.C. Sluz, J.E. Oberc, R.L. Young, D.W.
Copyright Year	2011
Description	Author affiliation: Johns Hopkins University, Applied Physics Laboratory, Laurel, MD 20723, USA (Juarez, J.C.; Sluz, J.E.; Oberc, R.L.; Young, D.W.)
Abstract	A 40-Gbps free-space optical communications (FSOC) link architecture incorporating high-sensitivity modems and a high-dynamic range optical automatic gain controller (OAGC) is presented. The architecture leverages 10-Gbps modems, each supporting 10-Gigabit Ethernet, to ease interfaces to commercial network systems. The 10-Gbps modems employ return-to-zero differential phase shift keying waveforms and a commercial Reed-Solomon forward error correction system for maximum channel sensitivity. For transmission over the FSOC link, the modem channels are wavelength multiplexed. When coupled with the OAGC, the communications system achieves a sensitivity of better than 10 photons per bit. Low-noise optical gain is provided by the OAGC with a noise figure of better than 3.1 dB and a dynamic range of greater than 60 dB. This paper discusses the development of the high-sensitivity modem architecture and high-dynamic range OAGC, addresses system level considerations with regards to operation over highly turbulent FSOC links, discusses metrics for characterizing their performance, and presents results of system tests against field-collected scintillation reproduced in the laboratory.
Starting Page	578
Ending Page	582
File Size	610060
Page Count	5
File Format	PDF
ISBN	9781467300797
ISSN	21557578
e-ISBN	9781467300810
DOI	10.1109/MILCOM.2011.6127735
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-11-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fiber communication Optical sensors Optical receivers Optical fibers Adaptive optics Optical amplifiers optical turbulence free-space optical communication RZ-DPSK
Content Type	Text
Resource Type	Article

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