Objectif 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. Champ scientifique 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 Thème(s) Data not available Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur NPL MANAGEMENT LTD. Contribution de l’UE Aucune donnée Adresse Queens Road 33 TW11 0LW TEDDINGTON Royaume-Uni Voir sur la carte Coût total Aucune donnée Participants (1) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire Centro Studi e Laboratori Telecomunicazioni SpA Italie Contribution de l’UE Aucune donnée Adresse Via G. Reiss Romoli, 274 10148 TORINO Voir sur la carte Liens Site web Opens in new window Coût total Aucune donnée