Low shrink and small bend performing drop cable

Patent metadata

Field	Value
Publication number	US-11366276-B2
Application number	US-202117186430-A
Country	US
Kind code	B2
Filing date	Feb 26, 2021
Priority date	Nov 20, 2017
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

Embodiments of an optical fiber cable are provided. The optical fiber cable includes at least one optical fiber, a buffer tube surrounding the at least one optical fiber, and at least one tensile element wound around the buffer tube. The at least one tensile element has a laylength of at least 200 mm. The optical fiber cable also includes an exterior jacket surrounding the tensile element. The exterior jacket is made up of at least one polyolefin, at least one thermoplastic elastomer, and at least one high aspect ratio inorganic filler. Further, the exterior jacket has an averaged coefficient of thermal expansion of no more than 120(10−6) m/mK.

First claim

What is claimed is:

1. A method of manufacturing a drop cable, comprising the steps of:
moving a buffer tube containing at least one optical fiber along a processing line at a rate of at least 200 meters/minute;
winding at least one strand of a tensile element around the buffer tube, the tensile element having a laylength of at least 200 millimeters; and
coating the tensile element with an exterior jacket, the exterior jacket comprising a polyolefin component, a thermoplastic elastomer component, and an inorganic filler component.

2. The method of claim 1 , further comprising the steps of:
wrapping the drop cable around a mandrel having a diameter of 60 mm three times;
sending an optical signal having a wavelength of 1550 nm through the a first end of the at least one optical fiber; and
losing less than 0.05 dB of the optical signal at a second end of the at least one optical fiber.

3. The method of claim 1 , further comprising the step of selecting at least one of an aramid, a carbon fiber, an ultra-high molecular weight polyethylene, an ethylene chlorotrifluoroethylene, a polybenzimidazole, a perfluoroalkoxy, a polytetrafluoroethylene, a polyphenylene sulfide, a liquid crystal polymer, or a polyphenylene benzobisoxazole for use as filaments in the at least one strand of the tensile element.

4. The method of claim 1 , further comprising the step of extruding a layer of a flame retardant, non-corrosive material around the at least one strand of a tensile element.

5. The method of claim 4 , further comprising the step of wrapping at least one strand of impregnated glass fibers around the layer of the flame retardant, non-corrosive material.

6. The method of claim 1 , further comprising the step of selecting the exterior jacket to comprise a composition of from 30% to 60% by weight of the thermoplastic elastomer component, from 5% to 30% by weight of the inorganic filler component, and with the remainder being the polyolefin component and/or other additives.

Assignees

• Corning Res & Dev Corp

Inventors

• Cheng Xiaole
• Gimblet Michael John

Classifications

• H01B7/10

  Contact cables, i.e. having conductors which may be brought into contact by distortion of the cable · CPC title

• G02B6/4293

  hybrid electrical and optical connections for transmitting electrical and optical signals · CPC title

• G02B6/4486

  Protective covering · CPC title

• G02B6/4431

  with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping (break-out terminations G02B6/4471) · CPC title

• G02B6/443 Primary

  Protective covering · CPC title