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：US20230213698A1

公开(公告)日：2023-07-06

申请号：US18148547

申请日：2022-12-30

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Reddy Munige ,  Apeksha Malviya ,  Anand Pandey

IPC: G02B6/036 ,  F21V8/00 ,  G02B6/028

CPC classification number: G02B6/03638 ,  G02B6/0003 ,  G02B6/028 ,  H04B10/80

Abstract: The present invention relates to an ultra-low loss optical fiber for long haul communications (100) comprising a core region (102) defined by a core relative refractive index and a cladding region surrounding the core region, defined by a cladding relative refractive index. In particular, the core region comprises a relative refractive index in a range of −0.06% to +0.06% and the cladding region is down-doped for entire radial cladding thickness. Moreover, the cladding region further comprises an inner cladding region (104) defined by an inner cladding relative refractive index and an outer cladding region (106) defined by an outer cladding relative refractive index. The inner cladding relative refractive index is less than the outer cladding relative refractive index.

公开(公告)号：US11573369B2

公开(公告)日：2023-02-07

申请号：US17316719

申请日：2021-05-11

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Munige ,  Apeksha Malviya ,  Anand Pandey

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

Abstract: The present disclosure provides an optical fibre (100). The optical fibre (100) includes a glass core (102), a trench region (106) and a cladding (108). The trench region (106) has a trench curve parameter αtrench in range of 5 to 8. The optical fibre (100) has a mode field diameter in range of 8.7 micrometers to 9.7 micrometers at wavelength of 1310 nanometer.

公开(公告)号：US11236006B2

公开(公告)日：2022-02-01

申请号：US16993176

申请日：2020-08-13

Applicant: Sterlite Technologies Limited

Inventor： Sandeep Gaikwad ,  Badri Gomatam ,  Anand Pandey

IPC: C03B37/018

Abstract: The present disclosure provides a method for fabrication of an optical fibre soot preform. The method includes production of silicon dioxide particles along with waste particulates. The silicon dioxide particles are produced using a precursor material in a combustion chamber. In addition, the method includes cooling of the silicon dioxide particles. Further, the method includes agglomeration of the silicon dioxide particles. Furthermore, the method includes separation of the waste particulates from the silicon dioxide particles. Moreover, the method includes dehydration of the silicon dioxide particles. Also, the method includes compaction of the silicon dioxide particles. The compaction of the silicon dioxide particles facilitates fabrication of the optical fibre soot preform.

公开(公告)号：US20210047226A1

公开(公告)日：2021-02-18

申请号：US16993176

申请日：2020-08-13

Applicant: Sterlite Technologies Limited

Inventor： Sandeep Gaikwad ,  Badri Gomatam ,  Anand Pandey

IPC: C03B37/018

Abstract: The present disclosure provides a method for fabrication of an optical fibre soot preform. The method includes production of silicon dioxide particles along with waste particulates. The silicon dioxide particles are produced using a precursor material in a combustion chamber. In addition, the method includes cooling of the silicon dioxide particles. Further, the method includes agglomeration of the silicon dioxide particles. Furthermore, the method includes separation of the waste particulates from the silicon dioxide particles. Moreover, the method includes dehydration of the silicon dioxide particles. Also, the method includes compaction of the silicon dioxide particles. The compaction of the silicon dioxide particles facilitates fabrication of the optical fibre soot preform.

公开(公告)号：US10408996B2

公开(公告)日：2019-09-10

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: G02B6/036 ,  G02B6/02 ,  G02B6/028

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：US20250052948A1

公开(公告)日：2025-02-13

申请号：US18798735

申请日：2024-08-08

Applicant: Sterlite Technologies Limited

Inventor： APEKSHA MALVIYA ,  Harshika Digarse ,  Srinivas Munige ,  Anand Pandey

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

Abstract: The present invention relates to an optical fiber (100, 101, 103, 105, 107) having a core region (102) and a cladding region (104). In particular, the cladding region (104) has exactly one down-doped region (210, 310) and an undoped region (212, 312). The down doped region (210, 310) is a continuous region adjacent to core region (102) such that radial position of minimum relative refractive index (214, 314) of the optical fiber (100, 101, 103, 105, 107) is within 3 micrometers (μm) from interface between the down doped region (210, 310) and the undoped region (212, 312). Further, the mode field diameter of the optical fiber (100, 101, 103, 105, 107) is in range of 8.8 μm to 9.6 μm at a wavelength 1310 nanometres (nm), and cable cut-off of the optical fiber (100, 101, 103, 105, 107) is less than or equal to 1260 nm.

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：US20240279104A1

公开(公告)日：2024-08-22

申请号：US18340870

申请日：2023-06-25

Applicant: Sterlite Technologies Limited

Inventor： RANJITH BALAKRISHNAN ,  Rano Roy Kavanal ,  Anant Pawale ,  Rajendra Raut ,  Srinivas Reddy Munige ,  Anand Pandey

IPC: C03B37/025

CPC classification number: C03B37/0253 ,  C03B2203/02 ,  C03B2205/40 ,  C03B2205/90

Abstract: The present invention relates to a method (200, 400, 500, 600) for drawing a bare optical fiber (118) from a cylindrical glass preform (102) in a furnace chamber (104) by hanging the cylindrical glass preform (102) near a first end (104a) of the furnace chamber (104), injecting first and second inert gasses inside the furnace chamber (104) in a predefined ratio of 0.3 to 5, and melting the cylindrical glass preform (102) while maintaining a positive pressure in the furnace chamber (104) to form the bare optical fiber (118) such that a Bare Fiber Diameter (BFD) variation of the bare optical fiber (118) is less than 0.1 micrometers (μm) from a mean diameter of the bare optical fiber (118).

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).