公开(公告)号：US20230314698A1

公开(公告)日：2023-10-05

申请号：US18177061

申请日：2023-03-01

Applicant: Sterlite Technologies Limited

Inventor： Apeksha Malviya ,  Priya Gupta ,  Srinivas Reddy ,  Anand Pandey

IPC: G02B6/028 ,  G02B6/02

CPC classification number: G02B6/0281 ,  G02B6/02004

Abstract: The present invention relates to an optical fiber (100) comprising a core region (102) having radius R1 and a cladding region (104) having a radius R3. In particular, the core region (102) is defined along a central longitudinal axis (110) and the cladding region (104) is defined along the central longitudinal axis (110) of the optical fiber (100). Moreover, the optical fiber (100) has a Mode Field Diameter in a range of 8.5+/−0.3 microns at a wavelength of 1310 nanometers, a micro-bending loss of less than equal to 0.5 dB/Km at a wavelength of 1550 nanometers, macro-bending loss of less than 1 dB/Km at a wavelength 1550 nanometers. Further, the optical fiber (100) has a diameter of less than 210 microns.

公开(公告)号：US11719878B2

公开(公告)日：2023-08-08

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 ,  C03C25/1065

CPC classification number: G02B6/02395 ,  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：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.

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：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：US20220003923A1

公开(公告)日：2022-01-06

申请号：US17316719

申请日：2021-05-11

Applicant: Sterlite Technologies Limited

Inventor： Srinivas Munige ,  Apeksha Malviya ,  Anand Pandey

IPC: G02B6/02

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：US20220003922A1

公开(公告)日：2022-01-06

申请号：US17316717

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 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：US20210047223A1

公开(公告)日：2021-02-18

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

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.