Prysmian Cavi E Sistemi Energia S.r.l.

Prysmian S.p.a.

Giuseppe Ferri

Franco Cocchini

Antonio Schiaffo

Alessandro Rossi

Andrea Mazzotti

Marco Antonio Caiata

Antonio Adigrat

Valeria Caronna

Stefano Grieco

Antonio Collaro

Alfonso Pannullo

Apparatus for applying traction to an elongate cylindrical element produced by fusion of an end portion of a preform of glass material, in which a traction device is capable of being connected to a portion of the elongate cylindrical element to provide traction of the elongate cylindrical element along an axis. A device for the rotation of the elongate cylindrical element applies a twist to the elongate cylindrical element about the axis simultaneously with the traction.

Plant for producing an elongate element usable for producing an optical fibre

Apparatus and method for applying traction to an elongate element produced by fusing a preform of glass material and usable in a process for producing an optical fibre

A process for producing a low-attenuation optical fiber by producing a soot core preform by chemical deposition on a substrate; removing the substrate from the soot core preform, thereby forming a central hole along the soot preform; drying and consolidating the soot core preform in a consolidation furnace to form a glass core preform; heating the glass preform in the consolidation furnace above a glass melting temperature to produce a reduction of the diameter of the central hole; and stretching the glass core preform to completely close the central hole.

Process for producing a low-attenuation optical fiber

A process for making a non-zero dispersion shifted optical fiber having low splice loss and low attenuation and to an optical fiber produced by this process. A reduction of the splice loss is observed with decreasing drawing tension. The optical fiber has a core region that includes three segments and an inner cladding segment, each having a maximum refractive index percent difference, &#x394;delta%, i=0-3, the subscriptreferring to a particular refractive index, the core segments being selected such that &#x394;delta%&#x3e;&#x394;delta%&#x3e;&#x394;delta%&#x2267;0 and &#x394;delta%&#x3e;&#x394;delta%&#x2267;0. Optical fibers exhibiting low splice loss were drawn at tensions not larger than 150 g, preferably not larger than 100 g.

Optical fibre having low splice loss and method for making it

Growing community of inventors

Cava Dei Tirreni, Italy

Giuseppe Ferri