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ajp-jp4199505C5115.pdf - Chemical Vapour Deposition for...

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HAL Id: jpa-00253785 Submitted on 1 Jan 1995 HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL , est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Chemical Vapour Deposition for Optical Fibre Technology L. Cognolato To cite this version: L. Cognolato. Chemical Vapour Deposition for Optical Fibre Technology. Journal de Physique IV Colloque, 1995, 05 (C5), pp.C5-975-C5-987. <10.1051/jphyscol:19955115>. <jpa-00253785>
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JOURNAL DE PHYSIQUE IV Colloque C5, supplkment au Journal de Physique 11, Volume 5, juin 1995 Chemical Vapour Deposition for Optical Fibre Technology L. Cognolato CSELT SPA, Via G. Reiss Romoli 274, 10148 Torino, Italy Abstract. At the beginning of the seventies, a break-through took place in the telecommunication research. The introduction of Chemical Vapour Deposition technology in the manufacture of optical fibres allowed both technical quality and economical convenience to realise optical networks, thus beginning the telecommunication revolution. Since that moment, a great development of the CVD techniques has been performed, introducing several methods to produce fibres with geometry and optical properties optimised for different applications. An overview of the different methods is given, and the problems which have been to be solved in these years are described. 1. INTRODUCTION The first complete theoretical analysis of electromagnetic propagation in dielectric cylinders was performed in 1910 [l]. However, it was only in the 1950s that optical fibres began to find practical applications, as "fiberscopes", flexible bundles for image transmission. But it was not until 1966 that their use in the field of optical communications was considered feasible. The reason of that was the attenuation exhibited by glass fibres available at that time was in the range of thousands of &/km. This allowed transmission only over short - distances. In 1966 it was demonstrated [2] that the attenuation found in glass employed for optical fibres was not a basic property of material but was produced by the presence of impurities, mainly metallic ions and OH groups. The intrinsic material loss is essentially due to Raleigh-type scattering, which decreases as the fourth power of wavelength. Since that loss is very low, reducing the impurity content would make it possible to attain much lower losses than those typically encountered.
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  • Fall '19
  • Chemical vapor deposition, JOURNAL DE PHYSIQUE IV

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