Abstract:
PROBLEM TO BE SOLVED: To reduce attenuation of a glass optical fiber due to heat aging and Rayleigh scattering in a heat treatment of the fiber. SOLUTION: In the method for forming an optical fiber, the optical fiber is formed by drawing at ≥10 m/sec draw rate from a heated glass source (block 10) and is heat-treated by maintaining the optical fiber within a heated treatment zone for the total resident time of 0.07-0.25 sec, while subjecting the optical fiber to an average cooling rate of 1,200-5,000 °C/sec defined by ä[fiber surface temperature in an inlet zone]-[fiber surface temperature in the outlet zone]}/[the total resident time of the optical fiber in the treatment zone] (block 20). COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
A method for forming an optical fiber includes drawing the optical fiber from a glass supply and treating the fiber by maintaining the optical fiber in a treatment zone wherein the fiber is cooled at a specified cooling rate. The optical fiber treatment reduces the tendency of the optical fiber to increase in attenuation due to Rayleigh scattering, and/or over time following formation of the optical fiber due to heat aging. Methods for producing optical fibers along nonlinear paths incorporating fluid bearings are also provided thereby allowing for increased vertical space for the fiber treatment zone.
Abstract:
A method for forming a doped optical fiber includes drawing the optical fiber from a doped glass supply at a draw speed and a draw tension sufficient to introduce a heat aging defect in the optical fiber. The optical fiber is treated by maintaining the optical fiber within a treatment temperature range for a treatment time while preferably maintaining the optical fiber within a treatment tension range to reduce the tendency of the optical fiber to increase in attenuation over time following formation of the optical fiber. Apparatus are also provided.
Abstract:
A method for forming a doped optical fiber includes drawing the optical fiber from a doped glass supply at a draw speed and a draw tension sufficient to introduce a heat aging defect in the optical fiber. The optical fiber is treated by maintaining the optical fiber within a treatment temperature range for a treatment time while preferably maintaining the optical fiber within a treatment tension range to reduce the tendency of the optical fiber to increase in attenuation over time following formation of the optical fiber. Apparatus are also provided.
Abstract:
A silica soot preform (12) is inserted into a furnace (30). The preform is then treated with heat and carbon monoxide gas (32) so as to reduce impuriti es that could effect the final product.
Abstract:
A silica soot preform (12) is inserted into a furnace (30). The preform is then treated with heat and carbon monoxide gas (32) so as to reduce impurities that could effect the final product.
Abstract:
A silica soot preform (12) is inserted into a furnace (30). The preform is then treated with heat and carbon monoxide gas (32) so as to reduce impurities that could effect the final product.