Sterlite Technologies Limited

Ranjith Balakrishnan

Anand Kumar Pandey

Apeksha Malviya

Srinivas Reddy Munige

Srinivas Reddy

Shubham

Janarthanan Balakrishnan

Anand Pandey

The present invention relates to an optical fiber () comprising a silica region (), a first coating (), and a second coating (). The first coating () is adapted to cover an outer circumference of the silica region (). The second coating () adapted to cover an outer surface of the first coating (). Moreover, the first coating () and the second coating () are adapted to cause a coating induced micro bend loss that is less than 2.2×10Nmm.

Optical fiber with improved microbending performance

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

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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Ranjith Balakrishnan