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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.
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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).
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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
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).
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4.
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.
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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
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.
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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.
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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
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).
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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).
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9.
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.
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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
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.
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