Sterlite Technologies Limited

Other

Anand Kumar Pandey

Kishore Chandra Sahoo

Sravan Kumar

Srinivas Reddy Munige

Apeksha Malviya

Ranjith Balakrishnan

Apeksha Malaviya

Srinivas Reddy

Sandeep Gaikwad

Badri Gomatam

MalleswaraRao Lanke

Malleswara Rao Lanke

Radhika Velayudhan

Shubham

Janarthanan Balakrishnan

Milind Patil

Anant Pawale

MalleshwaraRao Lanke

Malleswarrao Lanke

Phill Coppin

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.

Preform assembly for drawing multicore or holey optical fibre and method of manufacturing thereof

The present disclosure provides a multi-core fiber (MCF) and manufacturing method thereof and an MCF marker (or marker). The MCF () comprises a plurality of cores () and a marker (). Each core is associated with a core diameter () and a core-placement-radius () and the marker () is associated with a marker diameter () and a marker-placement-radius (). The marker has a marker core () and a marker clad () with a D/d ratio between 5 to 20. During manufacturing, the MCF is drawn from a preform assembly () having a top hollow handle () with a handle thickness () attached on a top end of a glass preform () that has a plurality of core holes () and a marker hole (), wherein the marker hole () is at least partially covered by the top hollow handle of the handle thickness ().

Multi-core fiber and manufacturing method thereof and multi-core fiber marker

The present disclosure provides an optical fibre. The 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. In addition, the primary coating layer sandwiched between the glass cladding and the secondary coating layer. Further, the secondary coating layer surrounds the primary coating layer. The primary coating layer has diameter of up to is in the range of 130 to 155 micrometers. Furthermore, the secondary coating layer has diameter in a range of about 160 micrometers to 180 micrometers. Moreover, diameter of the optical fibre is about 190 micrometers.

Reduced diameter optical fibre

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).

Trench assisted multi-core optical fiber with reduced crosstalk

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.

Method for fabrication of glass preform

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.

Ultra reduced diameter optical fibre

The present disclosure provides a universal optical fiber (). The universal optical fiber () includes a core () extended from a central longitudinal axis () to a first radius r. In addition, the universal optical fiber () includes a buffer clad () region extending from the first radius rto a second radius r. Further, the universal optical fiber () includes a trench region () extending from the second radius rto a third radius r. Furthermore, the universal optical fiber () includes a cladding () extending from the third radius to a fourth radius r. Moreover, the core (), the buffer clad region (), the trench region () and the cladding () are concentrically arranged.

Universal optical fiber

The present disclosure provides an optical fibre (). The optical fibre () includes a glass core region (). The glass core region () has a core relative refractive index profile. The core relative refractive index profile is a super Gaussian profile. In addition, the optical fibre () includes a glass cladding region () over the glass core region (). The optical fibre () 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 () 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 () 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.

Universal optical fibre with super Gaussian profile

The present disclosure provides an optical fibre (). The optical fibre () includes a glass core (), a trench region () and a cladding (). The trench region () has a trench curve parameter &#x3b1;in range of 5 to 8. The optical fibre () has a mode field diameter in range of 8.7 micrometers to 9.7 micrometers at wavelength of 1310 nanometer.

Universal optical fibre compatible with rod-in-cylinder

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.

Universal optical fibre with double trench

The present disclosure provides an optical fibre. The optical fibre includes a core extended from a central longitudinal axis to a first radius r. Further, the optical fibre includes a first trench region extended from a second radius rto a third radius r, a second trench region extended from the third radius rto a fourth radius rand a cladding region extended from the fourth radius rto a fifth radius r

Cutoff shifted optical fibre

The present disclosure provides an optical fibre. The optical fibre includes a core region, a primary trench region and a secondary trench region. The core region has a radius r. In addition, the core region has a relative refractive index &#x394;. Further, the primary trench region has a relative refractive index &#x394;. Furthermore, the primary trench region has a curve parameter &#x3b1;. Moreover, the secondary trench region has a relative refractive index &#x394;. Also, the secondary trench region has a curve parameter &#x3b1;.

Cut-off shifted optical fibre with large effective area

The present disclosure provides a few mode optical fiber (). The few mode optical fiber () includes a core (). The core () defined by a region around a central longitudinal axis () of the few mode optical fiber (). In addition, the core () has a super gaussian refractive index profile with curve parameter gammaand rescale factor (a). In addition, the core () has a first annular region () extended from central longitudinal axis () of the few mode optical fiber () to radius r. Further, the core () has a second annular region () extended from radius rto radius r. Furthermore, the core () has a third annular region () extended from radius rto radius r. In addition, the few mode optical fiber () has a cladding () extended from radius rto radius r.

Few mode optical fiber

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.

Method for fabrication of optical fibre soot preform

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 from the central longitudinal axis. Moreover, the core region () has a second annular region (). The second annular region () is defined from the first radius to a second radius. Further, the core region () has a third annular region (). The third annular region () is defined from the second radius to a third radius. Also, the optical fiber () includes a cladding (). The cladding region () has a fourth radius.

Growing community of inventors

Aurangabad, India

Anand Kumar Pandey