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Fibers For High-Speed Measurement

The purpose of this chapter is to provide information on multimode and single mode optical fibers (SMF) which will assist in their use for high-speed analog data collection schemes. The length and type of fiber required will vary depending on the application. Generally lengths will be 1 km or less; however, some experimenters with applications such as nuclear testing or others may want to run links several kilometers to a distant recording station. This is possible if the fiber has sufficiently low attenuation and large enough bandwidth to meet the requirements. Examples of applications for fast analog data systems which have used or might conceivably utilize high bandwidth fibers are: nuclear and non-nuclear weapons testing, fusion diagnostics, laser weapons testing, electric or magnetic field measurements of pulsed rf sources, and diagnostics in experiments using pulsed particle accelerators. The properties of fibers relating to transmission of analog data only are treated in this chapter. The uses of fibers as analog sensors or as amplifiers are treated in other chapters.