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19 September 1980 Power For Repeaters In Long Fiber-Optic Links
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Proceedings Volume 0224, Fiber Optics for Communications and Control; (1980)
Event: 1980 Technical Symposium East, 1980, Washington, D.C., United States
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.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Willard Wells "Power For Repeaters In Long Fiber-Optic Links", Proc. SPIE 0224, Fiber Optics for Communications and Control, (19 September 1980);

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