Sirti S.p.a.

Sip - Societa Italiana Per L-esercizio Delle Telecomunicazioni P.a.

Sip - Societa Italiana Per L'escercizio Delle Telecomunicazioni P.a.

Sip - Societa Italiana Per L-esbercizio Delle Telecommunicazioni P.a.

Societa Italiana Per L'esercizio Delle Telecommicazioni P.a.

Livio Cognolato

Angelantonio Gnazzo

Giuseppe Parisi

In order to fabricate strip monomode active optical waveguides for optical elecommunications, a layer of vitreous soot is deposited on a substrate and is impregnated with a solution of a precursor of a rare-earth dopant, and a radiation with a wavelength comprised in an absorption band of the dopant is moved along the soot, along a trajectory corresponding to the geometrical shape desired for the guide, thereby forming a vitrified strip.

Fabricating strip waveguides by consolidating a rare-earth-doped layer

In order to fabricate strip monomode active optical waveguides for optical telecommunications, a layer of vitreous soot is deposited on the interior of a tubular substrate and is impregnated with a solution of a precursor of a rare-earth dopant, and a radiation with a wavelength comprised in an absorption band of the dopant is moved along the soot, along a trajectory corresponding to the geometrical shape desired for the guide, thereby forming a vitrified strip.

Method of fabricating strip monomode active optical waveguides by

An article for use in producing silica optical fibers doped with a metal de obtained by synthesis from low pressure vapor reactants is made from an outer supporting tube extending along a longitudinal axis and having first and second longitudinally opposite ends and an inner surface on which silica and a dopant formed by a reaction between vapor-state reactants can be deposited over a longitudinally extending silica-deposition zone. Respective first and second joints engage the ends of the supporting tube and each have a fixed part and a rotating part. Each rotating part supports the respective end for rotation relative to the respective fixed part about the axis. At least one of the reactants is introduced into the supporting tube through the first joint and depleted gases are discharged through the second joint. An inner tube extends through one of the joints into the outer tube and is formed between the outer-tube ends with a radially throughgoing and axially extending slit in which is held a high-purity wool of wires of metal. The inner tube is supplied internally with a gaseous compound reactive with the metal wool to form the oxide and forming a compound therewith constituting one of the reactants.

Apparatus for manufacture of a silica optical fiber

Silica intended to form the core of an optical-fibre preform is deposited as an unvitrified soot inside a reaction tube, where a non-aqueous solution of dopant precursor(s) is then introduced without removing the tube from the lathe. The precursor(s) of the dopant(s) are dissolved in an anhydrous organic solvent. The solution containing the dopant precursor(s) is introduced into the reaction tube without removing the tube from the lathe so that the solution covers the whole surface of the deposited soot layer and impregnation of the deposited soot layer occurs.

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Baldissero Torinese, Italy

Livio Cognolato