Free-space optical communication link across 16 kilometers over the Chesapeake Bay to a modulated.pdf

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Free-space optical communication link across 16 kilometers over the Chesapeake Bay to a modulated.pdf

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Free-space optical communication link across 16 kilometers over the Chesapeake Bay to a modulated

F 1 t M L 8 C E W N C 4 W R L 1 R M S 2 S C P N C 4 W C N C 4 W W S 8 V 1 F t c r n 0 Optical Engineering 474, 045001 April 2008 O Downloaded Froree-space optical communication link across 6 kilometers over the Chesapeake Bay o a modulated retroreflector array ark Plett aboratory for the Physical Sciences 050 Greenmead Drive ollege Park, Maryland 20901 -mail: mplett@ illiam S. Rabinovich aval Research Laboratory ode 5654 555 Overlook Avenue SW ashington, DC 20375 ita Mahon -3 Communications Titan Group 1955 Freedom Drive eston, Virginia 20190 ike S. Ferraro FA 200 Defense Highway uite 405 rofton, Maryland 21114 eter G. Goetz aval Research Laboratory ode 5654 555 Overlook Avenue SW ashington, DC 20375 hristopher I. Moore, MEMBER SPIE aval Research Laboratory ode 8123 555 Overlook Avenue SW ashington, DC 20375 ade Freeman mart Logic Inc. 51 Shady Drive Abstract. This paper presents the results of a successful bidirectional free-space optical link across 16 km to a modulated retroreflector array. The link was implemented at the Naval Research Laboratory’s Chesa- peake Bay Detachment laser test range. A 6-W cw 1550-nm class 1 M interrogation beam was used to illuminate an array of three modulated cat’s-eye retroreflectors located on a tower across the Chesapeake Bay on Tilghman Island. The modulated retroreflectors had a diameter of 16 mm and were arranged in a triangular pattern with a spacing of 30 cm. The interrogating terminal employed a 100-rad divergence and a high-speed pointing and tracking system to maintain link alignment. Link testing occurred over 12 days in the months of September, October, and November of 2006. Topics presented in this paper include the link scenario for the 16-km free-space optical link, the link budget, and ter- minal designs, as well as link acquisition and performance. Link perfor- mance results presented include data transmission throughput, scintilla- tion data, and pointing and tracking results. ? 2008 Society of Photo-Optica