公开(公告)号：US12297116B2

公开(公告)日：2025-05-13

申请号：US16849951

申请日：2020-04-15

Applicant: Sterlite Technologies Limited

Inventor： Sandeep Gaikwad ,  Ranjith Balakrishnan ,  Badri Gomatam

IPC: B01J12/02 ,  B01J4/00 ,  C01B33/18 ,  C03B37/012

Abstract: The present disclosure provides a system for generating fumed silica particles for manufacturing of an optical fiber preform. The system includes a generator and a plurality of inlets connected with the generator. The generator includes a plurality of burners. The plurality of inlets include a first inlet, a second inlet, a third inlet and a fourth inlet. The first inlet provides passage for flow of a precursor material to the generator. The second inlet provides passage for flow of a first gas to the generator. The third inlet provides passage for flow of a second gas to the generator. The fourth inlet provides passage for flow of a carrier gas to the generator. The plurality of burners enables a chemical reaction between the precursor material, the first gas and the second gas that facilitates the generation of the fumed silica particles.

公开(公告)号：US20230204849A1

公开(公告)日：2023-06-29

申请号：US17698832

申请日：2022-03-18

Applicant: Sterlite Technologies Limited

Inventor： Apeksha Malviya ,  Srinivas Reddy Munige ,  Janarthanan Balakrishnan ,  Shubham ,  Ranjith Balakrishnan ,  Anand Pandey

IPC: G02B6/02

CPC classification number: G02B6/02009 ,  G02B6/02042

Abstract: Disclosed is a multi-core optical fiber having a plurality of cores extending parallelly along a central axis of the multi-core optical fiber. Each core of the plurality of cores is up-doped with an up-dopant. The multi-core optical fiber further has a plurality of buffer layers such that each buffer layer of the plurality of buffer layers envelop a corresponding core of the plurality of cores. Each buffer layer of the plurality of buffer layers has a predefined buffer layer thickness. The multi-core optical fiber further has a plurality of trench layers such that each trench layer of the plurality of trench layers envelops a corresponding buffer layer of the plurality of buffer layers. Each trench layer of the plurality of trench layers is down-doped with a down-dopant. The multi-core optical fiber has an inter-core crosstalk of less than −30 decibel/kilometres (dB/km) at a wavelength of 1550 nanometres (nm).

公开(公告)号：US20230204850A1

公开(公告)日：2023-06-29

申请号：US17698796

申请日：2022-03-18

Applicant: Sterlite Technologies Limited

Inventor： Anand Pandey ,  Ranjith Balakrishnan

IPC: G02B6/02 ,  G02B6/44

CPC classification number: G02B6/02042 ,  G02B6/02338 ,  G02B6/4482

Abstract: The present disclosure provides a multi-core fiber (MCF) and manufacturing method thereof and an MCF marker (or marker). The MCF (100) comprises a plurality of cores (102) and a marker (108). Each core is associated with a core diameter (104) and a core-placement-radius (106) and the marker (108) is associated with a marker diameter (110) and a marker-placement-radius (112). The marker has a marker core (116) and a marker clad (118) with a D/d ratio between 5 to 20. During manufacturing, the MCF is drawn from a preform assembly (200) having a top hollow handle (202) with a handle thickness (114) attached on a top end of a glass preform (204) that has a plurality of core holes (206) and a marker hole (210), wherein the marker hole (210) is at least partially covered by the top hollow handle of the handle thickness (114).

公开(公告)号：US12195380B2

公开(公告)日：2025-01-14

申请号：US17485495

申请日：2021-09-26

Applicant: Sterlite Technologies Limited

Inventor： Anand Pandey ,  Ranjith Balakrishnan ,  Srinivas Reddy ,  Apeksha Malviya

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

Abstract: The present invention discloses a preform assembly and a method for drawing a multicore optical fibre and a holey fibre. Particularly, the preform assembly includes a hollow cylindrical tube, a plurality of discs stacked inside the hollow cylindrical tube and a plurality of core rods inserted in a plurality of through holes in each of the plurality of discs.

公开(公告)号：US20230305224A1

公开(公告)日：2023-09-28

申请号：US18185685

申请日：2023-03-17

Applicant: Sterlite Technologies Limited

Inventor： Saurabh Kapoor ,  Ranjith Balakrishnan ,  Anand Pandey

IPC: G02B6/036 ,  G02B6/02

CPC classification number: G02B6/03694 ,  G02B6/02042 ,  G02B6/02338

Abstract: The present invention relates to an optical fiber (100, 200, 300, 400) comprising one or more cores (102), a clad enveloping the one or more cores and a buffer clad layer (202, 302, 402) between the first clad layer and the second clad layer. Particularly, the clad includes a first clad layer (104) is made of silica with less than 0.1% metallic impurity and a second clad layer (106) is made of silica with greater than 0.1% of metallic impurity. Further, the first clad layer has less than 800 ppm OH content, less than 10 ppm aluminium and less than 2 ppm sodium and the second clad layer has less than 50 ppm OH content, more than 10 ppm aluminium and more than 2 ppm sodium.

公开(公告)号：US20250002391A1

公开(公告)日：2025-01-02

申请号：US18747864

申请日：2024-06-19

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Reddy Munige ,  Ranjith Balakrishnan ,  Anand Kumar Pandey

IPC: C03B37/012 ,  C03B37/014 ,  C03B37/027 ,  G02B6/028

Abstract: The present invention relates to a method (300) for drawing an optical fiber (101) having step of stacking (302) at least two glass sub-preforms of a plurality of glass sub-preforms (114a-114n) inside a hollow cylindrical glass tube (108) to form a master glass preform (130) and melting (304) the bottom end (134) of the master glass preform (130) in a furnace (110) to continuously draw an optical fiber (101). In particular, the at least two glass sub-preforms are stacked in such that the master glass preform has a top end (132) and a bottom end (134) and each of the glass sub-preforms is defined by a first end (126) and a second end (128). Further, the first end (126) of a successive glass sub-preform is stacked on the second end (128) of a previous glass sub-perform such that the successive glass sub-preform rests on the previous glass sub-preform.

公开(公告)号：US12105321B2

公开(公告)日：2024-10-01

申请号：US17698796

申请日：2022-03-18

Applicant: Sterlite Technologies Limited

Inventor： Anand Pandey ,  Ranjith Balakrishnan

IPC: G02B6/02 ,  G02B6/44

CPC classification number: G02B6/02042 ,  G02B6/02338 ,  G02B6/4482

Abstract: The present disclosure provides a multi-core fiber (MCF) and manufacturing method thereof and an MCF marker (or marker). The MCF (100) comprises a plurality of cores (102) and a marker (108). Each core is associated with a core diameter (104) and a core-placement-radius (106) and the marker (108) is associated with a marker diameter (110) and a marker-placement-radius (112). The marker has a marker core (116) and a marker clad (118) with a D/d ratio between 5 to 20. During manufacturing, the MCF is drawn from a preform assembly (200) having a top hollow handle (202) with a handle thickness (114) attached on a top end of a glass preform (204) that has a plurality of core holes (206) and a marker hole (210), wherein the marker hole (210) is at least partially covered by the top hollow handle of the handle thickness (114).

公开(公告)号：US12032200B2

公开(公告)日：2024-07-09

申请号：US17698832

申请日：2022-03-18

Applicant: Sterlite Technologies Limited

Inventor： Apeksha Malviya ,  Srinivas Reddy Munige ,  Janarthanan Balakrishnan ,  Shubham ,  Ranjith Balakrishnan ,  Anand Pandey

IPC: G02B6/02

CPC classification number: G02B6/02009 ,  G02B6/02042

Abstract: Disclosed is a multi-core optical fiber having a plurality of cores extending parallelly along a central axis of the multi-core optical fiber. Each core of the plurality of cores is up-doped with an up-dopant. The multi-core optical fiber further has a plurality of buffer layers such that each buffer layer of the plurality of buffer layers envelop a corresponding core of the plurality of cores. Each buffer layer of the plurality of buffer layers has a predefined buffer layer thickness. The multi-core optical fiber further has a plurality of trench layers such that each trench layer of the plurality of trench layers envelops a corresponding buffer layer of the plurality of buffer layers. Each trench layer of the plurality of trench layers is down-doped with a down-dopant. The multi-core optical fiber has an inter-core crosstalk of less than −30 decibel/kilometres (dB/km) at a wavelength of 1550 nanometres (nm).

公开(公告)号：US20220315474A1

公开(公告)日：2022-10-06

申请号：US17485495

申请日：2021-09-26

Applicant: Sterlite Technologies Limited

Inventor： Anand Pandey ,  Ranjith Balakrishnan ,  Srinivas Reddy ,  Apeksha Malviya

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

Abstract: The present invention relates to a preform assembly and a method for drawing a multicore optical fibre and a holey fibre. Particularly, the preform assembly includes a hollow cylindrical tube, a plurality of discs stacked inside the hollow cylindrical tube and a plurality of core rods inserted in a plurality of through holes in each of the plurality of discs.

公开(公告)号：US20210047190A1

公开(公告)日：2021-02-18

申请号：US16849951

申请日：2020-04-15

Applicant: Sterlite Technologies Limited

Inventor： Sandeep Gaikwad ,  Ranjith Balakrishnan ,  Badri Gomatam

IPC: C01B33/18 ,  B01J4/00 ,  B01J12/02

Abstract: The present disclosure provides a system for generating fumed silica particles for manufacturing of an optical fiber preform. The system includes a generator and a plurality of inlets connected with the generator. The generator includes a plurality of burners. The plurality of inlets include a first inlet, a second inlet, a third inlet and a fourth inlet. The first inlet provides passage for flow of a precursor material to the generator. The second inlet provides passage for flow of a first gas to the generator. The third inlet provides passage for flow of a second gas to the generator. The fourth inlet provides passage for flow of a carrier gas to the generator. The plurality of burners enables a chemical reaction between the precursor material, the first gas and the second gas that facilitates the generation of the fumed silica particles.