US 11,655,185 B2
Coated optical fiber and method of making same
Michael Messerly, Danville, CA (US); Nicholas Calta, Oakland, CA (US); Selim Elhadj, Livermore, CA (US); Andrew Lange, Livermore, CA (US); Cody Wren Mart, Livermore, CA (US); Robert Mellors, Livermore, CA (US); Nick Schenkel, Livermore, CA (US); and Charles Xiao Yu, Pleasanton, CA (US)
Assigned to Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed by Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed on Apr. 3, 2020, as Appl. No. 16/839,281.
Claims priority of provisional application 62/843,758, filed on May 6, 2019.
Prior Publication US 2020/0354269 A1, Nov. 12, 2020
Int. Cl. C03B 37/03 (2006.01); C03C 25/106 (2018.01); C03B 37/15 (2006.01); C03C 25/18 (2006.01)
CPC C03C 25/1063 (2018.01) [C03B 37/032 (2013.01); C03B 37/15 (2013.01); C03C 25/18 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method of making a coated fiber, comprising:
drawing a preform through a furnace to create a fiber having a desired diameter and cross sectional shape;
continuing to draw the fiber through a slurry, wherein the slurry includes a plurality of elements, the plurality of elements including at least one of metallic elements, alloy elements or dielectric elements, and the slurry wets an outer surface of the fiber;
as the fiber is drawn through the slurry, drawing the fiber though a funnel-shaped forming die having an aperture at a lower end thereof, with a diameter of the aperture selected based on a viscosity of the slurry and a desired thickness of a wet coating to be imparted on an outer surface of the fiber, to create a wet fiber; and
continuing to draw the wet fiber into and through an oven configured to heat the wet coating sufficiently to produce a consolidated surface coating on the fiber as the fiber exits the oven; and
controlling a rheology of the slurry in part by controlling a temperature of the slurry as the fiber is drawn through the funnel-shaped forming die, and in part by at least one of:
adding at least one chemical compound to the slurry; or
subtracting at least one chemical compound from the slurry; or
modifying a concentration of at least one constituent of the slurry; and
wherein controlling the rheology of the slurry helps to control the viscosity of the slurry, to in turn control leakage of the slurry through the aperture while the fiber is being drawn through the aperture.