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：US20190162897A1

公开(公告)日：2019-05-30

申请号：US15942274

申请日：2018-03-30

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Reddy Munige ,  Anand Kumar Pandey

IPC: G02B6/028 ,  G02B6/02 ,  G02B6/036 ,  H04J14/04

Abstract: The present disclosure provides a few mode optical fiber. The few mode optical fiber includes a core region. A core region defined by a region around a central longitudinal axis of the few mode optical fiber. In addition, the core region has a first annular region extended from central longitudinal axis to radius r1, a second annular region extended from radius r1 to radius r2, a third annular region extended from radius r2 to radius r3, a fourth annular region extended from radius r3 to radius r4 and a fifth annular region extended from radius r4 to radius r5. Also, the few mode optical fiber has a cladding defined by the sixth annular region extended from radius r5 to radius r6.

公开(公告)号：US20230204851A1

公开(公告)日：2023-06-29

申请号：US17698812

申请日：2022-03-18

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Reddy Munige ,  Apeksha Malviya ,  Anand Pandey

IPC: G02B6/02

CPC classification number: G02B6/02042

Abstract: Disclosed is a multi-core optical fiber including a plurality of cores extending parallelly along a central axis of the multi-core optical fiber, and defining a plurality of spatial paths such that each core of the plurality of cores has a refractive index profile having a predefined core alpha value in a range from about 5 to about 9. A core pitch between each pair of cores of the plurality of cores is in a range from about 35 micrometres to about 45 micrometres. Further, at least one core of the plurality of cores has (i) a refractive index profile different from other cores of the plurality of cores, and (ii) a core diameter different from the other cores of the plurality of cores.

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：US20220057572A1

公开(公告)日：2022-02-24

申请号：US17316725

申请日：2021-05-11

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Reddy Munige ,  Apeksha Malviya ,  Anand Kumar Pandey

IPC: G02B6/02 ,  G02B6/36 ,  G02B6/036

Abstract: The present disclosure provides an optical fibre. The optical fibre includes a core, an inner cladding, a first trench region, an intermediate cladding, a second trench region, and an outer cladding. The core has a first radius. The inner cladding is defined by the first radius and a second radius of the optical fibre. The first trench region is defined by the second radius and a third radius. The first trench region. The intermediate cladding is defined by the third radius and a fourth radius. The second trench region is defined by the fourth radius and a fifth radius. The outer cladding is defined by the fifth radius and a sixth radius.

公开(公告)号：US10557986B2

公开(公告)日：2020-02-11

申请号：US16518990

申请日：2019-07-23

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Reddy Munige ,  Anand Kumar Pandey

IPC: G02B6/036 ,  G02B6/02 ,  G02B6/028 ,  H04J14/04

Abstract: The present disclosure provides a few mode optical fiber (100). The few mode optical fiber (100) includes a core region (102). A core region (102) defined by a region around a central longitudinal axis (116) of the few mode optical fiber (100). In addition, the core region (102) has a first annular region (106) extended from central longitudinal axis (116) to radius r1, a second annular region (108) extended from radius r1 to radius r2, a third annular region (110) extended from radius r2 to radius r3, a fourth annular region (112) extended from radius r3 to radius r4 and a fifth annular region (114) extended from radius r4 to radius r5. Also, the few mode optical fiber (100) has a cladding defined by the sixth annular region (104) extended from radius r5 to radius r6.

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：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).

公开(公告)号：US10520670B2

公开(公告)日：2019-12-31

申请号：US15942274

申请日：2018-03-30

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Reddy Munige ,  Anand Kumar Pandey

IPC: G02B6/028 ,  G02B6/036 ,  G02B6/02 ,  H04J14/04

Abstract: The present disclosure provides a few mode optical fiber. The few mode optical fiber includes a core region. A core region defined by a region around a central longitudinal axis of the few mode optical fiber. In addition, the core region has a first annular region extended from central longitudinal axis to radius r1, a second annular region extended from radius r1 to radius r2, a third annular region extended from radius r2 to radius r3, a fourth annular region extended from radius r3 to radius r4 and a fifth annular region extended from radius r4 to radius r5. Also, the few mode optical fiber has a cladding defined by the sixth annular region extended from radius r5 to radius r6.