公开(公告)号：US20230295033A1

公开(公告)日：2023-09-21

申请号：US18176539

申请日：2023-03-01

Applicant: Sterlite Technologies Limited

Inventor： Anant Pawale ,  Milind Patil ,  Anand Pandey ,  Pankaj Priyadarshi

IPC: C03B37/085 ,  C03B37/03

CPC classification number: C03B37/085 ,  C03B37/032 ,  C03B2205/80

Abstract: The present invention relates to a flexible sealing assembly (100) for an optical fiber draw furnace (500) comprising a first plurality of curved ring sections (110) arranged in a circular arrangement and a plurality of tension loaders (114) exerting continuous radially inward force on at least one curved ring section. Each curved ring section of the first plurality of curved ring sections (110) is separated from each other and defined by the same radius of curvature. Further, the first plurality of curved ring sections (110) is radially movable such that the first plurality of curved ring sections (110) creates a seal between a glass preform (504) and a vertical hollow body (506) in the optical fiber draw furnace (500). The diameter of the glass preform (504) varies.

公开(公告)号：US20210132290A1

公开(公告)日：2021-05-06

申请号：US17085777

申请日：2020-10-30

Applicant: Sterlite Technologies Limited

Inventor： Malleswarrao Lanke ,  Anand Pandey ,  Anant Pawale ,  Milind Patil

IPC: G02B6/02

Abstract: An optical fibre includes a glass core, a glass cladding, a primary coating layer and a secondary coating layer. The glass cladding surrounds the glass core. The glass cladding has a cladding refractive index. The primary coating layer is sandwiched between the glass cladding and the secondary coating layer. The primary coating layer may have one of a primary in-situ modulus in the range of 0.1 to 0.2 mega pascal and a primary coating thickness in the range of 2.5 micrometers to 10 micrometers. The secondary coating layer may have one or more of the secondary in-situ modulus greater than or equal to 1.2 giga pascal and the secondary coating thickness in a range of 2.5 to 17.5 micrometers.

公开(公告)号：US20190162898A1

公开(公告)日：2019-05-30

申请号：US15942303

申请日：2018-03-30

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Reddy Munige ,  MalleswaraRao Lanke ,  Radhika Velayudhan ,  Anand Pandey

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

CPC classification number: G02B6/02271 ,  G02B6/02014 ,  G02B6/0281 ,  G02B6/03644

Abstract: The present disclosure provides an optical fiber. The optical fiber includes a core region. The core region is defined by a region around central longitudinal axis of the optical fiber. In addition, the core region has a first annular region. The first annular region is defined from the central longitudinal axis to a first radius r1 from the central longitudinal axis. Moreover, the core region has a second annular region. The second annular region is defined from the first radius r1 to a second radius r2. Further, the core region has a third annular region. The third annular region is defined from the second radius r2 to a third radius r3. Also, the optical fiber includes a cladding. The cladding region has a fourth radius r4.

公开(公告)号：US20240280745A1

公开(公告)日：2024-08-22

申请号：US18340869

申请日：2023-06-25

Applicant: Sterlite Technologies Limited

Inventor： Apeksha Malviya ,  Srinivas Reddy Munige ,  Saurabh Kapoor ,  Anand Pandey

IPC: G02B6/036 ,  G02B6/02 ,  G02B6/44

CPC classification number: G02B6/03694 ,  G02B6/02042 ,  G02B6/4403

Abstract: The present invention relates to a multi-core optical fiber having a plurality of cores (102) and a cladding (108) surrounding the plurality of cores (102). The cladding (108) has a peripheral cladding layer (108b) that is down doped such that a leakage loss of the multi-core optical fiber (100) is less than 0.001 Decibel/Kilometer (dB/Km) at a wavelength 1550 nanometers (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：US11592616B2

公开(公告)日：2023-02-28

申请号：US17316717

申请日：2021-05-11

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Munige ,  Apeksha Malviya ,  Anand Pandey

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

Abstract: The present disclosure provides an optical fibre (100). The optical fibre (100) includes a glass core region (102). The glass core region (102) has a core relative refractive index profile. The core relative refractive index profile is a super Gaussian profile. In addition, the optical fibre (100) includes a glass cladding region (108) over the glass core region (102). The optical fibre (100) has at least one of a mode field diameter in a range of 8.7 micrometers to 9.7 micrometers at wavelength of 1310 nanometers and an attenuation up to 0.18 dB/km. The optical fibre (100) has at least one of macro-bend loss up to 0.5 decibel per turn corresponding to wavelength of 1550 nanometer at bending radius of 7.5 millimeter. The optical fibre (100) has a macro-bend loss up to 1.0 decibel per turn corresponding to wavelength of 1625 nanometer at bending radius of 7.5 millimeter.

公开(公告)号：US11237324B2

公开(公告)日：2022-02-01

申请号：US17162948

申请日：2021-01-29

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Reddy Munige ,  Anand Pandey

IPC: G02B6/028 ,  G02B6/036 ,  H04J14/04

Abstract: The present disclosure provides a few mode optical fiber (100). The few mode optical fiber (100) includes a core (102). The core (102) defined by a region around a central longitudinal axis (112) of the few mode optical fiber (100). In addition, the core (102) has a super gaussian refractive index profile with curve parameter gamma and rescale factor (a). In addition, the core (102) has a first annular region (104) extended from central longitudinal axis (112) of the few mode optical fiber (100) to radius r1. Further, the core (102) has a second annular region (106) extended from radius r1 to radius r2. Furthermore, the core (102) has a third annular region (108) extended from radius r2 to radius r3. In addition, the few mode optical fiber (100) has a cladding (110) extended from radius r3 to radius r4.

公开(公告)号：US20210239899A1

公开(公告)日：2021-08-05

申请号：US17162948

申请日：2021-01-29

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Reddy Munige ,  Anand Pandey

IPC: G02B6/028 ,  H04J14/04

Abstract: The present disclosure provides a few mode optical fiber (100). The few mode optical fiber (100) includes a core (102). The core (102) defined by a region around a central longitudinal axis (112) of the few mode optical fiber (100). In addition, the core (102) has a super gaussian refractive index profile with curve parameter gamma and rescale factor (a). In addition, the core (102) has a first annular region (104) extended from central longitudinal axis (112) of the few mode optical fiber (100) to radius r1. Further, the core (102) has a second annular region (106) extended from radius r1 to radius r2. Furthermore, the core (102) has a third annular region (108) extended from radius r2 to radius r3. In addition, the few mode optical fiber (100) has a cladding (110) extended from radius r3 to radius r4.

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：US11912604B2

公开(公告)日：2024-02-27

申请号：US16993182

申请日：2020-08-13

Applicant: Sterlite Technologies Limited

Inventor： Sandeep Gaikwad ,  Badri Gomatam ,  Anand Pandey

IPC: C03B19/06 ,  C01B33/12 ,  C03C3/06 ,  C01B33/18

CPC classification number: C03B19/066 ,  C01B33/12 ,  C01B33/183 ,  C03B19/063 ,  C03C3/06 ,  C03B2201/03 ,  C03C2201/02

Abstract: The present disclosure provides a method for fabrication of a glass preform. The method includes production of soot particles in a combustion chamber using a precursor material. The heating of the precursor material produces the soot particles along with one or more impurities. In addition, the method includes agglomeration of the soot particles. Further, the method includes separation of the soot particles from the one or more impurities. Also, the separation of the soot particles is performed in a cyclone separator. Furthermore, the method includes collection of the soot particles. Also, the soot particles are compacted with facilitation of a preform compaction chamber. Also, the compacted preform is sintered with facilitation of a sintering furnace. The compaction of the soot particles followed by sintering results in formation of the glass preform.