Patents by Inventor Antonio Collaro
Antonio Collaro has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10544057Abstract: A method of manufacturing a glass core preform for an optical fibre comprising: providing a porous soot core preform having an outer surface) and a central hole extending axially therethrough; dehydrating the porous soot core preform at a first temperature by exposing the outer surface of the preform to an atmosphere containing chlorine, and simultaneously consolidating the soot core preform and closing the central hole at a second temperature higher than the first temperature to form a glass core preform, wherein consolidating and closing comprises sequentially alternating flowing chlorine containing gas into the central hole and reducing the internal pressure of the central hole.Type: GrantFiled: June 12, 2015Date of Patent: January 28, 2020Assignee: PRYSMIAN S.p.A.Inventors: Franco Cocchini, Antonio Adigrat, Valeria Caronna, Marco Antonio Caiata, Antonio Collaro, Antonio Schiaffo
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Publication number: 20180265395Abstract: A method of manufacturing a glass core preform for an optical fibre comprising: providing a porous soot core preform having an outer surface) and a central hole extending axially therethrough; dehydrating the porous soot core preform at a first temperature by exposing the outer surface of the preform to an atmosphere containing chlorine, and simultaneously consolidating the soot core preform and closing the central hole at a second temperature higher than the first temperature to form a glass core preform, wherein consolidating and closing comprises sequentially alternating flowing chlorine containing gas into the central hole and reducing the internal pressure of the central hole.Type: ApplicationFiled: June 12, 2015Publication date: September 20, 2018Inventors: Franco Cocchini, Antonio Adigrat, Valeria Caronna, Marco Antonio Caiata, Antonio Collaro, Antonio Schiaffo
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Patent number: 9656902Abstract: A method of manufacturing at least one optical fibre preform comprising: providing a plurality of partially porous intermediate preforms, each partially porous intermediate preform having a longitudinal axis and comprising a respective soot intermediate clad layer formed around a respective glass core rod comprising a central core region of radius a and an inner clad region of radius b to define a first core-to-clad ratio a/b; consolidating the formed soot intermediate clad layers to form a respective plurality of intermediate glass preforms, each of the plurality of intermediate glass preforms comprising an intermediate clad region having an external radius c to define a second core-to-clad ratio a/c of from 0.20 to 0.Type: GrantFiled: December 28, 2012Date of Patent: May 23, 2017Assignee: PRYSMIAN S.P.A.Inventors: Antonio Adigrat, Valeria Caronna, Franco Cocchini, Antonio Collaro, Stefano Grieco, Ida Nivelli
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Patent number: 9416045Abstract: A method of manufacturing an optical fibre preform comprising: providing a glass core rod comprising a central core region of radius a and an inner clad region of external radius b to define a first core-to-clad ratio a/b; forming an intermediate glass preform comprising an intermediate clad region surrounding the inner clad region of the glass rod and having an external radius c to define a second core-to-clad ratio a/c, and overcladding the intermediate glass preform by forming an overclad region surrounding the intermediate clad region to form an optical fibre preform, wherein the first core-to-clad ratio a/b is equal to or less than 0.40 and the second core-to-clad ratio a/c is of from 0.20 to 0.25.Type: GrantFiled: December 28, 2012Date of Patent: August 16, 2016Assignee: Prysmian S.p.A.Inventors: Antonio Adigrat, Valeria Caronna, Franco Cocchini, Antonio Collaro, Stefano Grieco, Ida Nivelli
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Publication number: 20150336840Abstract: A method of manufacturing an optical fibre preform comprising: providing a glass core rod comprising a central core region of radius a and an inner clad region of external radius b to define a first core-to-clad ratio a/b; forming an intermediate glass preform comprising an intermediate clad region surrounding the inner clad region of the glass rod and having an external radius c to define a second core-to-clad ratio a/c, and overcladding the intermediate glass preform by forming an overclad region surrounding the intermediate clad region to form an optical fibre preform, wherein the first core-to-clad ratio a/b is equal to or less than 0.40 and the second core-to-clad ratio a/c is of from 0.20 to 0.25.Type: ApplicationFiled: December 28, 2012Publication date: November 26, 2015Inventors: Antonio Adigrat, Valeria Caronna, Franco Cocchini, Antonio Collaro, Stefano Grieco, Ida Nivelli
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Publication number: 20150329403Abstract: A method of manufacturing at least one optical fibre preform comprising: providing a plurality of partially porous intermediate preforms, each partially porous intermediate preform having a longitudinal axis and comprising a respective soot intermediate clad layer formed around a respective glass core rod comprising a central core region of radius a and an inner clad region of radius b to define a first core-to-clad ratio a/b; consolidating the formed soot intermediate clad layers to form a respective plurality of intermediate glass preforms, each of the plurality of intermediate glass preforms comprising an intermediate clad region having an external radius c to define a second core-to-clad ratio a/c of from 0.20 to 0.Type: ApplicationFiled: December 28, 2012Publication date: November 19, 2015Inventors: Antonio Adigrat, Valeria Caronna, Franco Cocchini, Antonio Collaro, Stefano Grieco, Ida Nivelli
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Patent number: 9097868Abstract: A method for detecting faulty laying down of an optical cable exhibiting a measured cut-off wavelength includes providing an optical cable for transmitting optical signals including at least one single-mode optical fiber having an attenuation equal to or larger than a first threshold value as measured when wound for one turn around a bending radius equal to or smaller than 5 mm at at least one predetermined test wavelength, the test wavelength being smaller than the measured cut-off wavelength, and an attenuation smaller than a second threshold value as measured when wound for one turn around a bending radius equal to at least a minimum bending radius at an operative wavelength equal to or larger than the measured cut-off wavelength; laying the optical cable; and measuring the attenuation in the at least one optical fiber at the predetermined test wavelength.Type: GrantFiled: May 7, 2010Date of Patent: August 4, 2015Assignee: PRYSMIAN S.P.AInventors: Marco Ruzzier, Susanna Cattelan, Andrea Macchetta, Antonio Collaro, Valeria Caronna
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Patent number: 9069114Abstract: A single-mode optical fiber for transmitting optical signals includes a central core region for guiding the optical signals, and a cladding region surrounding the core region and including a void-containing annular layer containing randomly distributed voids, wherein the void-containing layer is doped with fluorine at a concentration of less than 1 wt % and has a radial thickness equal to or smaller than 3 ?m.Type: GrantFiled: July 23, 2010Date of Patent: June 30, 2015Assignee: PRYSMIAN S.P.A.Inventors: Antonio Adigrat, Franco Cocchini, Antonio Collaro, Antonello Schiaffo
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Publication number: 20130142491Abstract: A method for detecting faulty laying down of an optical cable exhibiting a measured cut-off wavelength includes providing an optical cable for transmitting optical signals including at least one single-mode optical fibre having an attenuation equal to or larger than a first threshold value as measured when wound for one turn around a bending radius equal to or smaller than 5 mm at at least one predetermined test wavelength, the test wavelength being smaller than the measured cut-off wavelength, and an attenuation smaller than a second threshold value as measured when wound for one turn around a bending radius equal to at least a minimum bending radius at an operative wavelength equal to or larger than the measured cut-off wavelength; laying the optical cable; and measuring the attenuation in the at least one optical fibre at the predetermined test wavelength.Type: ApplicationFiled: May 7, 2010Publication date: June 6, 2013Inventors: Marco Ruzzier, Susanna Cattelan, Andrea Macchetta, Antonio Collaro, Valeria Caronna
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Publication number: 20130121655Abstract: A single-mode optical fibre for transmitting optical signals includes a central core region for guiding the optical signals, and a cladding region surrounding the core region and including a void-containing annular layer containing randomly distributed voids, wherein the void-containing layer is doped with fluorine at a concentration of less than 1 wt % and has a radial thickness equal to or smaller than 3 ?m.Type: ApplicationFiled: July 23, 2010Publication date: May 16, 2013Inventors: Antonio Adigrat, Franco Cocchini, Antonio Collaro, Antonello Schiaffo
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Patent number: 8265437Abstract: Telecommunication cable comprising at least one microstructured optical fiber comprising a core region and a cladding region surrounding the core region, the cladding region comprising an annular void-containing region comprised of randomly arranged voids, the core region including doped silica to provide a positive refractive index relative to pure silica; and at least one protecting layer provided around said optical fiber, the protecting layer being made of a polymeric material having a low ultimate elongation.Type: GrantFiled: September 19, 2008Date of Patent: September 11, 2012Assignee: Prysmian S.p.A.Inventors: Enrico Consonni, Franco Cocchini, Antonio Collaro, Antonio Adigrat
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Patent number: 8089619Abstract: A manufacturing process of a microstructured optical fiber including a void-containing region, includes the steps of: drawing a microstructured optical fiber along a longitudinal direction from a heated preform, wherein the optical fiber is continuously advanced along the longitudinal direction; directing a radiation beam at a longitudinal position in the longitudinal direction of the optical fiber so as to produce an interference pattern; detecting the interference pattern and producing at least one electrical detection signal corresponding to the interference pattern and including a plurality of signal fringe cycles; feeding the first detection signal into a first counter circuit; determining a first number of interference fringe increments in the plurality of signal wave fringe cycles of the at least one detection signal by using the first counter circuit; determining the outer diameter of the optical fiber, and controlling the microstructure of the optical fiber during advancement of the optical fiber.Type: GrantFiled: September 19, 2008Date of Patent: January 3, 2012Assignee: Prysmian S.p.A.Inventors: Franco Cocchini, Antonio Collaro, Antonio Adigrat, Antonio Faraldi, Francesco Di Matteo, Paolo Russo
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Publication number: 20110170836Abstract: Telecommunication cable comprising at least one microstructured optical fibre comprising a core region and a cladding region surrounding the core region, the cladding region comprising an annular void-containing region comprised of randomly arranged voids, the core region including doped silica to provide a positive refractive index relative to pure silica; and at least one protecting layer provided around said optical fibre, the protecting layer being made of a polymeric material having a low ultimate elongation.Type: ApplicationFiled: September 19, 2008Publication date: July 14, 2011Inventors: Enrico Consonni, Franco Cocchini, Antonio Collaro, Antonio Adgrat
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Publication number: 20110157582Abstract: A manufacturing process of a microstructured optical fibre including a void-containing region, includes the steps of: drawing a microstructured optical fibre along a longitudinal direction from a heated preform, wherein the optical fibre is continuously advanced along the longitudinal direction; directing a radiation beam at a longitudinal position in the longitudinal direction of the optical fibre so as to produce an interference pattern; detecting the interference pattern and producing at least one electrical detection signal corresponding to the interference pattern and including a plurality of signal fringe cycles; feeding the first detection signal into a first counter circuit; determining a first number of interference fringe increments in the plurality of signal wave fringe cycles of the at least one detection signal by using the first counter circuit; determining the outer diameter of the optical fibre, and controlling the microstructure of the optical fibre during advancement of the optical fibre.Type: ApplicationFiled: September 19, 2008Publication date: June 30, 2011Inventors: Franco Cocchini, Antonio Collaro, Antonio Adigrat, Antonio Faraldi, Francesco Di Matteo, Paolo Russo
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Patent number: 7849713Abstract: 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, ?deltai %, i=0-3, the subscript i referring to a particular refractive index, the core segments being selected such that ?delta0%>?delta2%>?delta1%?0 and ?delta2%>?delta3%?0. Optical fibers exhibiting low splice loss were drawn at tensions not larger than 150 g, preferably not larger than 100 g.Type: GrantFiled: December 24, 2002Date of Patent: December 14, 2010Assignee: Prysmian Cavi E Sistemi Energia S.R.L.Inventors: Antonio Collaro, Giuseppe Ferri, Alfonso Pannullo
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Publication number: 20070003200Abstract: A process for making a non-zero dispersion shifted optical fibre having low splice loss and low attenuation and to an optical fibre produced by this process. A reduction of the splice loss is observed with decreasing drawing tension. The optical fibre has a core region that includes three segments and an inner cladding segment, each having a maximum refractive index percent difference, ?deltai %, i=0-3, the subscript i referring to a particular refractive index, the core segments being selected such that ?delta0%>?delta2%>?delta1%?0 and ?delta2%>?delta3%?0. Optical fibres exhibiting low splice loss were drawn at tensions not larger than 150 g, preferably not larger than 100 g.Type: ApplicationFiled: December 24, 2002Publication date: January 4, 2007Inventors: Antonio Collaro, Giuseppe Ferri
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Publication number: 20050126227Abstract: A process for manufacturing an optical fibre by producing a glass core rod; measuring the refraction index profile in a plurality of sections of the core rod, for obtaining a corresponding plurality of refractive index profiles; processing the plurality of refractive index profiles for determining a drawing tension variation law; depositing glass soot onto the core rod to obtain a glass preform; consolidating the glass preform; and drawing the optical fibre from the glass preform by applying a drawing tension to the optical fibre, wherein drawing tension is varied in accordance to the drawing tension variation law.Type: ApplicationFiled: December 19, 2001Publication date: June 16, 2005Inventor: Antonio Collaro