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：US20230324602A1

公开(公告)日：2023-10-12

申请号：US18176565

申请日：2023-03-01

Applicant: Sterlite Technologies Limited

Inventor： Apeksha Malviya ,  Janarthanan Balakrishnan ,  Priya Gupta ,  Shubham Kumar ,  Srinivas Reddy ,  Anand Pandey

IPC: C03B37/012 ,  G02B6/02 ,  G02B6/036

CPC classification number: G02B6/02042 ,  C03B37/01222 ,  G02B6/02009 ,  G02B6/03638

Abstract: The present invention relates to an optical fiber with improved bend performance and manufacturing method thereof. The optical fiber (100) comprises a core region (108) defined by a core refractive index profile (200) and a cladding region (106) surrounding the core region defined by a cladding refractive index profile (400). Particularly, the core region has a first core (102) defined by a first core refractive index (RI) profile (202) and a first core RI max (Δpeak) and a second core (104) defined by a second core RI profile (204) and a second core RI max (Δcore). Moreover, the cladding region further comprises a first cladding (106) and a third cladding (110) composed of pure silica and a second cladding (108) composed of a down-doped silica, where the down-dopant is fluorine.

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：US20210047224A1

公开(公告)日：2021-02-18

申请号：US16849848

申请日：2020-04-15

Applicant: Sterlite Technologies Limited

Inventor： Subhanshu Aggarwal ,  Chitra D ,  Janarthanan Balakrishnan ,  Hima Harode

IPC: C03B37/012

Abstract: The present disclosure provides a method for sintering of an optical fiber preform. The method includes preheating of the optical fiber preform in a sintering chamber. In addition, the method includes first downfeeding of the optical fiber preform into a sintering furnace in the presence of helium gas and chlorine gas. The first downfeeding of the optical fiber preform facilitates sintering of an outer layer of the optical fiber preform. Further, the method includes pulling out the optical fiber preform from the sintering furnace in presence of chlorine gas and at least one of nitrogen gas and helium gas. Further, the method includes second down feeding of the optical fiber preform in the sintering furnace in the presence of nitrogen gas and chlorine gas. The second downfeeding of the optical fiber preform facilitates sintering of the optical fiber preform.