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Remote-Ended Time Domain Bandwidth Measurements on Installed Regenerator Sections of Multimode Optical Fibre Cable in the British Telecom Network,
BRITISH TELECOM LONDON (ENGLAND)
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The measurement of bandwidth of multimode optical fibres is an established technique. It has normally been made on drums of fibre in the laboratory and on installed fibres where the distant-ends have been looped. In these cases both ends of the fibre are available at one location. This paper describes a technique developed for making time domain bandwidth measurements when both ends of the fibre are separated ie at two locations as in a telecommunication system. In the UK early systems had regenerator sections of up to 10 km long and 30 dB optical loss. The method described in the appear enables easy synchronisation of the transmitter and receiver of the measurement system over these sections. A comparison of results obtained for fibre on drum when tested with ends adjacent and when simulating ends remote is discussed. Measurements made on part of the British Telecom network of installed optical fibre cables are described and the uncertainties involved in these measurements are discussed. Author
APPROVED FOR PUBLIC RELEASE