公开(公告)号：US11524920B2

公开(公告)日：2022-12-13

申请号：US17112192

申请日：2020-12-04

Applicant: Corning Incorporated

Inventor： Sumitava De ,  Robert Clark Moore ,  Douglas Gregg Neilson ,  Pushkar Tandon

IPC: C03C25/12 ,  C03C25/105 ,  C03C25/18

Abstract: An optical fiber coating apparatus that provides increased gyre stability and reduced gyre strength, thereby providing a more reliable coating application process during fiber drawing includes a cone-only coating die having a conical entrance portion with a tapered wall angled at a half angle α, wherein 2°≤α≤25°, and a cone height L1 less than 2.2 mm, and a cylindrical portion having an inner diameter of d2, wherein 0.1 mm≤d2≤0.5 mm and a cylindrical height of L2, wherein 0.05 mm≤L2≤1.25 mm; a guide die having an optical fiber exit, the guide die disposed adjacent the cone-only coating die such that a wetted length (L5) between the optical fiber exit of the guide die and the entrance of the cone-only coating die is from 1 mm to 5 mm; and a holder for holding the cone-only coating die and the guide die in a fixed relationship defining a coating chamber between the guide die and the cone-only coating die, the coating chamber having an inner radius L6 from the optical fiber axis to an inner wall of the holder that is from 3 mm to 10 mm.

公开(公告)号：US11518709B2

公开(公告)日：2022-12-06

申请号：US16380603

申请日：2019-04-10

Applicant: Corning Incorporated

Inventor： Dana Craig Bookbinder ,  Darren Andrew Stainer ,  Pushkar Tandon ,  Ruchi Tandon ,  Bryan William Wakefield

IPC: C03C25/18 ,  C03B37/025 ,  C03C25/105

Abstract: An optical fiber coating die assembly is provided. The optical fiber coating die assembly includes a housing defining a guide chamber having an inlet for receiving optical fiber and an outlet, a guide die located at the outlet of the guide chamber, and a sizing die. The optical fiber coating die assembly also includes a coating applicator disposed between the guide die and the sizing die, and a tube operatively coupled to the inlet of the guide chamber and axially aligned with the chamber to receive the optical fiber fed into the guide chamber and provide a barrier to air flow.

公开(公告)号：US11506834B2

公开(公告)日：2022-11-22

申请号：US17319167

申请日：2021-05-13

Applicant: CORNING INCORPORATED

Inventor： Snigdharaj Kumar Mishra ,  Pushkar Tandon

IPC: G02B6/02 ,  G02B6/028 ,  G02B6/036

Abstract: A single mode optical fiber is provided that includes a core region having an outer radius r1 and a maximum relative refractive index Δ1max. The single mode optical fiber has a bend loss at 1550 nm for a 15 mm diameter mandrel of less than about 0.75 dB/turn, has a bend loss at 1550 nm for a 20 mm diameter mandrel of less than about 0.2 dB/turn, and a bend loss at 1550 nm for a 30 mm diameter mandrel of less than 0.002 dB/turn. Additionally, the single mode optical fiber has a mode field diameter of 9.0 microns or greater at 1310 nm wavelength and a cable cutoff of less than or equal to about 1260 nm.

公开(公告)号：US20220291445A1

公开(公告)日：2022-09-15

申请号：US17682379

申请日：2022-02-28

Applicant: CORNING INCORPORATED

Inventor： Ming-Jun Li ,  Pushkar Tandon

IPC: G02B6/036 ,  G02B6/44

Abstract: The disclosure provides optical fibers that exhibit low macrobend loss at 1550 nm at bend diameters between 10 mm and 40 mm. The relative refractive index profile of the fibers includes a trench cladding region with small depth, large width and a trench volume configured to minimize macrobend loss at large and small bend diameters. The optical fiber includes an outer cladding region that surrounds and is directly adjacent to the trench cladding region and an optional offset cladding region between the trench cladding region and the core region. In some embodiments, the trench cladding region has a relative refractive index that decreases monotonically from the inner radius to the outer radius. The monotonic decrease in relative refractive index may have a constant slope. The low macrobend loss at large and small diameters makes the optical fibers well suited for space-constrained deployment environments, such as data centers.

公开(公告)号：US20220283362A1

公开(公告)日：2022-09-08

申请号：US17670941

申请日：2022-02-14

Applicant: CORNING INCORPORATED

Inventor： Kevin Wallace Bennett ,  Pushkar Tandon

IPC: G02B6/02

Abstract: A multicore optical fiber includes an inner glass region having a plurality of core regions surrounded by a common outer cladding, the inner glass region further having at least one marker and an outer diameter in the range of 120 microns and 130 microns, wherein each core region is comprised of a germania-doped silica core and a fluorine-doped silica trench, wherein the trench volume of the fluorine-doped silica trench is greater than 50% Δ microns2. The fiber has an outer coating layer surrounding the inner glass region, the outer coating layer having a primary coating layer and a secondary coating layer with a diameter of the secondary coating layer equal to or less than 200 microns, wherein each core region has a mode field diameter greater than 8.2 microns at 1310 nm, a cable cutoff wavelength of less than 1260 nm, and zero dispersion wavelength of less than 1335 nm.

公开(公告)号：US11407682B2

公开(公告)日：2022-08-09

申请号：US16930723

申请日：2020-07-16

Applicant: CORNING INCORPORATED

Inventor： Dana Craig Bookbinder ,  Pushkar Tandon ,  Ruchi Tandon

IPC: C03C25/20 ,  C03B37/025 ,  C03B37/027 ,  C03B37/03 ,  C03C13/04 ,  C03C25/1065 ,  C03C25/285

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.

公开(公告)号：US11287567B2

公开(公告)日：2022-03-29

申请号：US16419403

申请日：2019-05-22

Applicant: Corning Incorporated

Inventor： Scott Robertson Bickham ,  Dana Craig Bookbinder ,  Ming-Jun Li ,  Snigdharaj Kumar Mishra ,  Pushkar Tandon

IPC: G02B6/028 ,  G02B6/02 ,  H01S5/183

Abstract: Optical fibers having a large effective area and a low cutoff wavelength are disclosed. Three main embodiments of the optical fiber allow for single-mode operation at wavelengths greater than 980 nm, and have a large effective area with low bend losses and low dispersion at 1310 nm. The large effective area optical fiber is expected to be particularly useful for data center applications due to its ability to efficiently optically couple with VCSELs and photonic integrated devices. Integrated systems and optical communication systems that employ the optical fibers are also disclosed.

公开(公告)号：US20220066090A1

公开(公告)日：2022-03-03

申请号：US17411192

申请日：2021-08-25

Applicant: CORNING INCORPORATED

Inventor： Pushkar Tandon

IPC: G02B6/02 ,  G02B6/028

Abstract: A multicore optical fiber comprising: a depressed index common-cladding region having a refractive index Δcc; and a plurality of core portions disposed within the depressed index common-cladding region, wherein each core portion comprises: a central axis, a core region comprising a relative refractive index Δ1, an inner-cladding region encircling and directly contacting the core region comprising a relative refractive index Δ2, a trench region encircling and directly contacting the inner cladding region comprising a relative refractive index Δ3, and an outer-cladding region encircling and directly contacting the trench region comprising a relative refractive index Δ4, wherein the refractive index of the depressed index common-cladding region Δcc is less than the refractive index of the outer-cladding region Δ4, and wherein a difference between the refractive index of the depressed index common-cladding region Δcc and the refractive index of the first outer-cladding region Δ4 is greater than 0.05% Δ.

公开(公告)号：US11261121B2

公开(公告)日：2022-03-01

申请号：US16165633

申请日：2018-10-19

Applicant: Corning Incorporated

Inventor： Dana Craig Bookbinder ,  Steven Bruce Dawes ,  Richard Michael Fiacco ,  Ming-Jun Li ,  Pushkar Tandon

IPC: C03B37/014 ,  C03B37/012 ,  C03B37/018 ,  C03B37/027 ,  G02B6/02

Abstract: Preparation of halogen-doped silica is described. The preparation includes doping silica with high halogen concentration, sintering halogen-doped silica to a closed-pore state, and subjecting the closed-pore silica body to a thermal treatment process and/or a pressure treatment process. The temperature of thermal treatment is sufficiently high to facilitate reaction of unreacted doping precursor trapped in voids or interstices of the glass structure, but is below temperatures conducive to foaming. Core canes or fibers drawn from halogen-doped silica subjected to the thermal treatment and/or pressure treatment show improved optical quality and possess fewer defects. The thermal treatment and/or pressure treatment is particularly advantageous when used for silica doped with high concentrations of halogen.

公开(公告)号：US20220026629A1

公开(公告)日：2022-01-27

申请号：US17443588

申请日：2021-07-27

Applicant: CORNING INCORPORATED

Inventor： Pushkar Tandon ,  Snigdharaj Kumar Mishra

IPC: G02B6/02 ,  G02B6/036

Abstract: A multicore optical fiber comprises a common cladding and a plurality of core portions disposed in the common cladding. Each of the core portions includes a central axis, a core region extending from the central axis to a radius r1, the core region comprising a relative refractive index Δ1, an inner cladding region extending from the radius r1 to a radius r2, the inner cladding region comprising a relative refractive index Δ2, and a depressed cladding extending from the radius r2 to a radius r3, the depressed cladding region comprising a relative refractive index Δ3 and a minimum relative refractive index Δ3 min. The relative refractive indexes may satisfy Δ1>Δ2>Δ3 min. The mode field diameter of each core portion may greater than or equal to 8.2 μm and less than or equal to 9.5 μm.