Objective Optical fibre is the dominant medium for communications systems. Each length of fibre must meet a specified performance before being incorporated into telecommunications networks. The cut-off wavelength defines the wavelength above which only one mode is guided. This parameter cannot be as yet measured with satisfactory precision, especially in the case of active fibres. The overall objective of the project is to reduce the uncertainty with which cut-off wavelength is measured down to +/- 2 nm. The project consists of two phases: 1: research in order to: - carry out a set of studies of the CCITT test method based on the transmitted power technique, to unambiguously identify the nature and cause of spectral anomalies in both passive and active fibres; - investigate an innovative test method for the determination of the cut-off wavelength based on the variation with wavelength of the mode field diameter. This method is expected to be less sensitive to spectral anomalies for all fibre types. 2: round-robin intercomparison of measurements of cut-off wavelength, incorporating the improvements in measurement techniques defined in phase 1. Fields of science engineering and technologyelectrical engineering, electronic engineering, information engineeringinformation engineeringtelecommunicationstelecommunications networksnatural sciencesphysical sciencesopticsfibre optics Programme(s) FP3-MAT - Specific research and technological development programme (EEC) in the field of measurements and testing, 1990-1994 Topic(s) Data not available Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator NPL MANAGEMENT LTD. EU contribution No data Address Queens Road 33 TW11 0LW TEDDINGTON United Kingdom See on map Total cost No data Participants (1) Sort alphabetically Sort by EU Contribution Expand all Collapse all Centro Studi e Laboratori Telecomunicazioni SpA Italy EU contribution No data Address Via G. Reiss Romoli, 274 10148 TORINO See on map Links Website Opens in new window Total cost No data
