Patents by Inventor Ruchi Tandon

Ruchi Tandon 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).

  • Patent number: 11407682
    Abstract: An optical fiber draw system and method of coating an optical fiber. The system includes a furnace for heating an optical fiber preform, a draw assembly for drawing the optical fiber at a draw speed greater than 50 meters per second, a first coating applicator for applying a first coating onto the fiber, and a first curing assembly comprising a first plurality of light sources comprising light-emitting diodes for partially curing the first coating. The optical fiber draw system also includes a second coating applicator for applying a second coating onto the fiber on top of the first coating, and a second curing system comprising a second plurality of light sources for curing the second coating, wherein the first coating is further cured in the range of 15-50 percent after leaving the first curing assembly.
    Type: Grant
    Filed: July 16, 2020
    Date of Patent: August 9, 2022
    Assignee: Corning Incorporated
    Inventors: Dana Craig Bookbinder, Pushkar Tandon, Ruchi Tandon
  • Patent number: 11194107
    Abstract: The high-density FAU comprises a support substrate having a grooved front-end section that supports glass end sections of the small diameter low-attenuation optical fibers. A cover is disposed on the front-end section and secured thereto to hold the glass end sections in place. The substrate and the cover can be made of the same glass or glasses having about the same CTE. The glass end sections have a diameter d4 so that the pitch P2 of the fibers at the front end of the FAU can be equal to or greater than d4, wherein d4=2r4, with r4 being the radius of the glass end section as defined by the optical fiber cladding. The glass end section has a radius r4 less than 45 microns, allowing for a high-density FAU and a high-density optical interconnection device.
    Type: Grant
    Filed: August 14, 2020
    Date of Patent: December 7, 2021
    Assignee: Corning Incorporated
    Inventors: Kevin Wallace Bennett, Scott Robertson Bickham, Ximao Feng, Wen-Lung Kuang, Pushkar Tandon, Ruchi Tandon, Shudong Xiao, Bryan William Wakefield, Andy Fenglei Zhou
  • Publication number: 20210373273
    Abstract: Embodiments of an optical fiber cable are provided. The cable includes a cable jacket and at least one buffer tube. Each buffer tube surrounds a plurality of optical fibers. The cable jacket surrounds the at least one buffer tube. Further, a coating of superabsorbent, swellable hot melt is applied to at least one of the following locations: (i) along at least a portion of the length of at least one of the plurality of optical fibers; (ii) along at least a portion of the length of the exterior or interior surface of the at least one buffer tube; or (iii) along at least a portion of the length of the interior surface of the cable jacket. Moreover, the superabsorbent, swellable hot melt is capable of absorbing at least 50 g of water per gram of superabsorbent, swellable hot melt.
    Type: Application
    Filed: August 17, 2021
    Publication date: December 2, 2021
    Inventors: Dana Craig Bookbinder, Ruchi Tandon
  • Patent number: 11187853
    Abstract: An optical fiber comprising: (a) a core having an outer radius r1; (b) a cladding having an outer radius r4<32.5 microns; (c) a primary coating surrounding the cladding having an outer radius r5, a thickness tP>8 microns, in situ modulus EP?0.35 MPa and a spring constant ?P<2.0 MPa, where ?P=2EP r4/tP; and (d) a secondary coating surrounding said primary coating, the secondary coating having an outer radius r6 and a thickness tS=r6?r5, and in situ modulus ES of 1200 MPa or greater; tS>8 microns, r6?56 microns. The fiber has a mode field diameter MFD greater than 8.2 microns at 1310 nm; a fiber cutoff wavelength of less than 1310 nm; and a bend loss at a wavelength of 1550 nm, when wrapped around a mandrel having a diameter of 10 mm, of less than 1.0 dB/turn.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: November 30, 2021
    Assignee: Corning Incorporated
    Inventors: Kevin Wallace Bennett, Scott Robertson Bickham, Pushkar Tandon, Ruchi Tandon
  • Patent number: 11181687
    Abstract: An optical fiber comprising: a core having an outer radius r1; a cladding having an outer radius r4<45 microns; a primary coating surrounding the cladding and having an outer radius r5 and a thickness tp>8 microns, the primary coating having in situ modulus EP of 0.35 MPa or less and a spring constant ?P<1.6 MPa, where ?P=2EP r4/tP; and a secondary coating surrounding said primary coating, the secondary coating having an outer radius r6, a thickness tS=r6?r5, in situ modulus ES of 1200 MPa or greater, wherein >10 microns and r6?85 microns. The fiber has a mode field diameter MFD greater than 8.2 microns at 1310 nm; a cutoff wavelength of less than 1310 nm; and a bend loss at a wavelength of 1550 nm, when wrapped around a mandrel having a diameter of 10 mm, of less than 1.0 dB/turn.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: November 23, 2021
    Assignee: Corning Incorporated
    Inventors: Kevin Wallace Bennett, Scott Robertson Bickham, Pushkar Tandon, Ruchi Tandon, Bryan William Wakefield
  • Patent number: 11181686
    Abstract: An optical fiber comprising: a core having an outer radius r1; a cladding having an outer radius r4?31 microns; a primary coating surrounding the cladding having an outer radius r5, a thickness tp>10 microns, in situ modulus EP of 0.5 MPa or less, and a spring constant ?P<1 MPa, where ?P=2EP r4/tP; and a secondary coating surrounding said primary coating, the secondary coating having an outer radius r6, a thickness tS=r6-r5, in situ modulus ES of 1200 MPa or greater; tS greater than 9.5 microns, wherein r6 is 50 to 67.5 microns. The fiber has a mode field diameter MFD greater than 8.2 microns at 1310 nm; a fiber cutoff wavelength of less than 1310 nm; and a bend loss at a wavelength of 1550 nm, when wrapped around a mandrel having a diameter of 10 mm, of less than 1.0 dB/turn.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: November 23, 2021
    Assignee: CORNING INCORPORATED
    Inventors: Kevin Wallace Bennett, Scott Robertson Bickham, Pushkar Tandon, Ruchi Tandon
  • Patent number: 11119270
    Abstract: The present description provides reduced-diameter multimode optical fibers. The optical fibers include a reduced-diameter glass fiber and/or reduced-thickness coatings. The overall diameter of the optical fibers is less than 210 ?m and examples with diameters less than 160 ?m are presented. Puncture resistant secondary coatings enable thinning of the secondary coating without compromising protection of the glass fiber. The optical fibers are suitable for data center applications and features high modal bandwidth, low attenuation, low microbending sensitivity, and puncture resistance in a compact form factor.
    Type: Grant
    Filed: February 18, 2020
    Date of Patent: September 14, 2021
    Assignee: Corning Incorporated
    Inventors: Scott Robertson Bickham, Yangbin Chen, Ching-Kee Chien, Ming-Jun Li, Pushkar Tandon, Ruchi Tandon
  • Patent number: 11105998
    Abstract: Embodiments of an optical fiber cable are provided. The cable includes a cable jacket and at least one buffer tube. Each buffer tube surrounds a plurality of optical fibers. The cable jacket surrounds the at least one buffer tube. Further, a coating of superabsorbent, swellable hot melt is applied to at least one of the following locations: (i) along at least a portion of the length of at least one of the plurality of optical fibers; (ii) along at least a portion of the length of the exterior or interior surface of the at least one buffer tube; or (iii) along at least a portion of the length of the interior surface of the cable jacket. Moreover, the superabsorbent, swellable hot melt is capable of absorbing at least 50 g of water per gram of superabsorbent, swellable hot melt.
    Type: Grant
    Filed: November 18, 2019
    Date of Patent: August 31, 2021
    Assignee: CORNING RESEARCH & DEVELOPMENT CORPORATION
    Inventors: Dana Craig Bookbinder, Ruchi Tandon
  • Patent number: 11054573
    Abstract: The present description provides multimode optical fibers with reduced cladding thickness. The optical fibers include a reduced-diameter glass fiber and/or reduced-thickness coatings. The overall diameter of the optical fibers is less than 210 ?m and examples with diameters less than 160 ?m are presented. Puncture resistant secondary coatings enable thinning of the secondary coating without compromising protection of the glass fiber. The optical fibers are suitable for data center applications and features high modal bandwidth, low attenuation, low microbending sensitivity, and puncture resistance in a compact form factor.
    Type: Grant
    Filed: February 4, 2020
    Date of Patent: July 6, 2021
    Assignee: Corning Incorporated
    Inventors: Scott Robertson Bickham, Pushkar Tandon, Ruchi Tandon
  • Patent number: 11036000
    Abstract: The present disclosure provides optical fibers with an impact-resistant coating system. The fibers feature low attenuation. The coating system includes a primary coating and a secondary coating. The primary coating and secondary coating have reduced thickness to provide low-diameter fibers without sacrificing protection. The primary coating has high tear strength and is resistant to damage caused by mechanical force. The secondary coating has high puncture resistance. The outer diameter of the optical fiber is less than or equal to 190 ?m.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: June 15, 2021
    Assignee: Corning Incorporated
    Inventors: Scott Robertson Bickham, Ming-Jun Li, Pushkar Tandon, Ruchi Tandon
  • Publication number: 20210132289
    Abstract: An optical fiber includes an outer diameter less than 220 ?m, a glass fiber that includes a glass core and a glass cladding, a primary coating, and a secondary coating. The glass cladding surrounds and is in direct contact with the glass core. The primary coating surrounds and is in direct contact with the glass fiber. The primary coating can have a Young's modulus less than 0.5 MPa and a thickness less than 30.0 ?m. The secondary coating surrounds and is in direct contact with the primary coating. The secondary coating can have a thickness less than 27.5 ?m. A pullout force of the optical fiber can be less than a predetermined threshold when in an as-drawn state. The pullout force may increase by less than a factor of 2.0 upon aging the primary and secondary coatings on the glass fiber for at least 60 days.
    Type: Application
    Filed: October 6, 2020
    Publication date: May 6, 2021
    Inventors: Ching-Kee Chien, Pushkar Tandon, Ruchi Tandon
  • Publication number: 20210094873
    Abstract: An optical fiber curing component includes a first tube comprising a first body defining a first interior surface and a first exterior surface, the first tube defining a first aperture and a second aperture on opposite ends of a first cavity, wherein the first tube defines a central axis extending through the first cavity; light sources coupled to the first body of the first tube and configured to emit light toward the central axis of the first tube, wherein each of the light sources intersect a common plane defined perpendicular to the central axis of the first tube; a silica glass article, having an anti-reflective coating, disposed between each of the plurality of light sources and the central axis of the first tube; and a reflective coating positioned on the interior surface of the first body and configured to reflect the light toward the central axis of the first tube.
    Type: Application
    Filed: September 24, 2020
    Publication date: April 1, 2021
    Inventors: Dana Craig Bookbinder, Stephan Lvovich Logunov, Darren Andrew Stainer, Pushkar Tandon, Ruchi Tandon
  • Publication number: 20210055490
    Abstract: The high-density FAU comprises a support substrate having a grooved front-end section that supports glass end sections of the small diameter low-attenuation optical fibers. A cover is disposed on the front-end section and secured thereto to hold the glass end sections in place. The substrate and the cover can be made of the same glass or glasses having about the same CTE. The glass end sections have a diameter d4 so that the pitch P2 of the fibers at the front end of the FAU can be equal to or greater than d4, wherein d4=2r4, with r4 being the radius of the glass end section as defined by the optical fiber cladding. The glass end section has a radius r4 less than 45 microns, allowing for a high-density FAU and a high-density optical interconnection device.
    Type: Application
    Filed: August 14, 2020
    Publication date: February 25, 2021
    Inventors: Kevin Wallace Bennett, Scott Robertson Bickham, Ximao Feng, Wen-Lung Kuang, Pushkar Tandon, Ruchi Tandon, Shudong Xiao, Bryan William Wakefield, Andy Fenglei Zhou
  • Publication number: 20210032160
    Abstract: An optical fiber draw system and method of coating an optical fiber. The system includes a furnace for heating an optical fiber preform, a draw assembly for drawing the optical fiber at a draw speed greater than 50 meters per second, a first coating applicator for applying a first coating onto the fiber, and a first curing assembly comprising a first plurality of light sources comprising light-emitting diodes for partially curing the first coating. The optical fiber draw system also includes a second coating applicator for applying a second coating onto the fiber on top of the first coating, and a second curing system comprising a second plurality of light sources for curing the second coating, wherein the first coating is further cured in the range of 15-50 percent after leaving the first curing assembly.
    Type: Application
    Filed: July 16, 2020
    Publication date: February 4, 2021
    Inventors: Dana Craig Bookbinder, Pushkar Tandon, Ruchi Tandon
  • Publication number: 20200369563
    Abstract: The systems and methods of forming optical fiber coatings with reduced defects include moving a bare optical fiber through first and second coating sub-systems. The first coating sub-system forms a first coating on the bare optical fiber by depositing a first coating material and then curing the deposited first coating material with actinic light. This process also results in the formation of stray actinic light. The process also includes moving the coated optical fiber through a second coating sub-system to form a second coating on the first coating. A light-blocking device resides between the first and second coating sub-systems to block the stray actinic light. Without the light-blocking device, the stray actinic light can enter the second coating sub-system and reach the second coating material therein and form a gel therefrom, which in turn leads to defects in the coated optical fiber exiting the second coating sub-system.
    Type: Application
    Filed: May 12, 2020
    Publication date: November 26, 2020
    Inventors: Benjamin David Bayless, Dana Craig Bookbinder, Stephan Lvovich Logunov, Darren Andrew Stainer, Ruchi Tandon
  • Patent number: 10775557
    Abstract: An optical fiber includes an outer diameter less than 220 ?m, a glass fiber that includes a glass core and a glass cladding, a primary coating, and a secondary coating. The glass cladding surrounds and is in direct contact with the glass core. The primary coating surrounds and is in direct contact with the glass fiber. The primary coating can have a Young's modulus less than 0.5 MPa and a thickness less than 30.0 ?m. The secondary coating surrounds and is in direct contact with the primary coating. The secondary coating can have a thickness less than 27.5 m. A pullout force of the optical fiber can be less than a predetermined threshold when in an as-drawn state. The pullout force may increase by less than a factor of 2.0 upon aging the primary and secondary coatings on the glass fiber for at least 60 days.
    Type: Grant
    Filed: November 4, 2019
    Date of Patent: September 15, 2020
    Assignee: Corning Incorporated
    Inventors: Ching-Kee Chien, Pushkar Tandon, Ruchi Tandon
  • Publication number: 20200271857
    Abstract: The present description provides multimode optical fibers with reduced cladding thickness. The optical fibers include a reduced-diameter glass fiber and/or reduced-thickness coatings. The overall diameter of the optical fibers is less than 210 ?m and examples with diameters less than 160 ?m are presented. Puncture resistant secondary coatings enable thinning of the secondary coating without compromising protection of the glass fiber. The optical fibers are suitable for data center applications and features high modal bandwidth, low attenuation, low microbending sensitivity, and puncture resistance in a compact form factor.
    Type: Application
    Filed: February 4, 2020
    Publication date: August 27, 2020
    Inventors: Scott Robertson Bickham, Pushkar Tandon, Ruchi Tandon
  • Publication number: 20200271858
    Abstract: The present description provides reduced-diameter multimode optical fibers. The optical fibers include a reduced-diameter glass fiber and/or reduced-thickness coatings. The overall diameter of the optical fibers is less than 210 ?m and examples with diameters less than 160 ?m are presented. Puncture resistant secondary coatings enable thinning of the secondary coating without compromising protection of the glass fiber. The optical fibers are suitable for data center applications and features high modal bandwidth, low attenuation, low microbending sensitivity, and puncture resistance in a compact form factor.
    Type: Application
    Filed: February 18, 2020
    Publication date: August 27, 2020
    Inventors: Scott Robertson Bickham, Yangbin Chen, Ching-Kee Chien, Ming-Jun Li, Pushkar Tandon, Ruchi Tandon
  • Publication number: 20200225404
    Abstract: The present disclosure provides optical fibers with an impact-resistant coating system. The fibers feature low attenuation. The coating system includes a primary coating and a secondary coating. The primary coating and secondary coating have reduced thickness to provide low-diameter fibers without sacrificing protection. The primary coating has high tear strength and is resistant to damage caused by mechanical force. The secondary coating has high puncture resistance. The outer diameter of the optical fiber is less than or equal to 190 ?m.
    Type: Application
    Filed: December 17, 2019
    Publication date: July 16, 2020
    Inventors: Scott Robertson Bickham, Ming-Jun Li, Pushkar Tandon, Ruchi Tandon
  • Patent number: 10689544
    Abstract: Fiber coatings with low Young's modulus, low fiber pullout force for fibers in the as-drawn state, and small time-dependent increases in pullout force as the fiber ages. The fiber coatings are cured products of coating compositions that include an oligomer formed from an isocyanate, a hydroxy acrylate compound and a polyol. The oligomer includes a polyether urethane acrylate and a di-adduct compound. The reaction mixture used to form the oligomer includes a molar ratio of isocyanate:hydroxy acrylate:polyol of n:m:p, where when p is 2, n is in the range from 3.0 to 5.0 and m is in the range from 1.50n-3 to 2.50n-5. Control of the n:m:p ratio leads to compositions that, when cured, provide coatings and cured products having low Young's modulus, low pullout force on glass, and weak variations with time as the fiber ages.
    Type: Grant
    Filed: May 1, 2019
    Date of Patent: June 23, 2020
    Assignee: Corning Incorporated
    Inventors: John William Botelho, Ching-Kee Chien, Jill Ann Cummings, Pushkar Tandon, Ruchi Tandon