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Proceedings Paper

Power For Repeaters In Long Fiber-Optic Links
Author(s): Willard Wells
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Paper Abstract

Coaxial cables that carry data over long distances, say 500 to 3000 miles, require repeaters every 20 miles, more or less, depending on the information bandwidth and cable design. The same coaxial conductors may also carry dc power to the repeaters, and usually this additional function has little if any effect on the design of the cable as determined by rf considerations. The situation is very different when fiber-optic cable is used in the same application. Conductors and insulation for repeater power are a major factor in cable size and cost. This paper reports optimum sizes of conducting and insulating layers for repeater power. The resulting cable design is suitable for a benign environment. However, most routes of practical interest impose extra requirements such as strength and armor that increase the cable size and cost beyond our estimates, which serve as a base from which to upgrade the design. For example, we find that a basic cable 3000 miles long, powered from only one end can be less than a quarter inch in diameter. In all cases the optimum design varies along the length of the cable. Repeaters are connected in series, and so the insulation is thickest near the power supply where voltage is highest. The optimum conductor crossection tapers the other way being thinnest near the power supply.

Paper Details

Date Published: 19 September 1980
PDF: 8 pages
Proc. SPIE 0224, Fiber Optics for Communications and Control, (19 September 1980); doi: 10.1117/12.958676
Show Author Affiliations
Willard Wells, Tetra Tech, Inc. (United States)

Published in SPIE Proceedings Vol. 0224:
Fiber Optics for Communications and Control
Charles W. Kleekamp, Editor(s)

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