公开(公告)号：JP2001106544A

公开(公告)日：2001-04-17

申请号：JP2000248107

申请日：2000-08-18

Applicant: CORNING INC

Inventor： HARVEY JILL A ,  HAWTOF DANIEL W ,  SPICER HENRY A

IPC: G02B6/00 ,  C03B37/027 ,  C03B37/029

Abstract: PROBLEM TO BE SOLVED: To provide a method and device for drawing an optical waveguide fiber which minimizes the fiber bow induced by the deviated stress in the clad layer of the fiber. SOLUTION: The fiber 11 is drawn from a preform 20 heated in a drawing furnace 12. The gas introduced into the top 21 of the furnace advances through the inside of the furnace 12 into a tube 31 and forms a boundary layer adjacent to the fiber. The tube 31 isolates the fiber 11 from the ambient atmosphere and the boundary layer of the gas formed in the furnace is maintained in a substantially uniform state until the temperature sufficiently high for the viscosity of the clad layer of the fiber to minimize the deviated stress in the circumferential direction of the fiber is attained.

公开(公告)号：CA2084258A1

公开(公告)日：1993-11-02

申请号：CA2084258

申请日：1992-12-01

Applicant: CORNING INC

Inventor： HARVEY JILL A ,  HAWTOF DANIEL W ,  SPICER HENRY A

IPC: G02B6/00 ,  C03B37/027 ,  C03B37/029

Abstract: A method and apparatus for drawing an optical waveguide fiber which minimizes fiber bow caused by differential stresses in the cladding layer of the fiber are disclosed. The fiber is drawn from a preform which is heated in a draw furnace. Gases introduced at the top of the furnace form a boundary layer adjacent to the fiber which passes through the furnace, along with the fiber, into a tube. The tube isolates the fiber from the ambient atmosphere so that the boundary layer of gases established in the furnace remains substantially uniform until the viscosity of the cladding layer of the fiber is high enough to minimize differential stresses around the circumference of the fiber.