Matrix material for rollable optical fiber ribbons

Patent metadata

Field	Value
Publication number	US-11585995-B2
Application number	US-201917256016-A
Country	US
Kind code	B2
Filing date	Oct 30, 2019
Priority date	Nov 5, 2018
Publication date	Feb 21, 2023
Grant date	Feb 21, 2023

Abstract

The present disclosure provides a matrix material for a rollable optical fibre ribbon. The rollable optical fibre ribbon includes a plurality of optical fibres and the matrix material. In addition, each of the plurality of optical fibres is placed parallel to other optical fibres of the plurality of optical fibres. Further, the matrix material joins the plurality of optical fibres. Furthermore, the matrix material has different glass transition temperature at different pressures.

First claim

What is claimed is:

1. A rollable optical fibre ribbon comprising:
a plurality of optical fibres, wherein each of the plurality of optical fibres is placed parallel to other optical fibres of the plurality of optical fibres; and
a matrix material, wherein the matrix material is applied partially between adjacent fibres of the plurality of optical fibres to join the plurality of optical fibres intermittently along a length of the rollable optical fibre ribbon, wherein the matrix material has secant modulus of 49 mega-Pascal at strain of 2.5% and water resistant property, wherein the cured coating of the matrix material with 250 micron film absorbs 3% of water in 24 hours, wherein pitch of the rollable optical fibre ribbon is 250 microns.

2. The rollable optical fibre ribbon as claimed in claim 1 , wherein the matrix material of the rollable optical fibre ribbon is applied in a form of a liquid coating, wherein the liquid coating of the matrix material over the plurality of optical fibres of the rollable optical fibre ribbon has at least one of:
viscosity of 9900 milli-Pascal second at temperature of 25 degree Celsius,
density of 1110 kilogram per cubic meter at temperature of 23 degree Celsius.

3. The rollable optical fibre ribbon as claimed in claim 1 , wherein a liquid coating of the matrix material is cured by exposure of the matrix material to ultraviolet radiation to form a cured coating of the matrix material.

4. The rollable optical fibre ribbon as claimed in claim 1 , wherein the matrix material has at least one of:
glass transition temperature of −18 degree Celsius at pressure of 1000 mega-Pascal,
glass transition temperature of −28 degree Celsius at pressure of 100 mega-Pascal,
degree of cure of 0.5 at ultraviolet radiation of 95% of secant modulus.

5. The rollable optical fibre ribbon as claimed in claim 1 , wherein the matrix material has at least one of:
75 micron film that produces 0.2 micro liter per gram hydrogen in air at temperature of 80 degree Celsius.

6. The rollable optical fibre ribbon as claimed in claim 1 , wherein the matrix material has at least one of:
viscosity in a range of 10000 milli-Pascal second to 12000 milli-Pascal second at a first temperature range of 20 degree Celsius to 30 degree Celsius,
viscosity in a range of 0 milli-Pascal second to 2000 milli-Pascal second at a second temperature range of 50 degree Celsius to 60 degree Celsius.

7. The rollable optical fibre ribbon as claimed in claim 1 , wherein the matrix material has constant cure speed at ultraviolet radiation in a range of 0.5 joule per square centimeter to 1 joule per square centimeter.

8. The rollable optical fibre ribbon as claimed in claim 1 , wherein the matrix material is a curable ultraviolet acrylate.

Assignees

• Sterlite Tech Ltd

Inventors

• Murthy Venkatesh
• Sahoo Kishore Chandra
• Kumar Sravan
• Mishra Atul
• Shukla Vikas

Classifications

• G02B6/02

  Optical fibres with cladding {with or without a coating} · CPC title

• G02B6/4403 Primary

  with ribbon structure (G02B6/4429, G02B6/4439, G02B6/4479 take precedence) · CPC title

• G02B6/44

  Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables (cables incorporating electric conductors and optical fibres {where features relating to the optical fibres are not of interest} H01B11/22) · CPC title