| 摘要 |
<p><P>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. <P>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). <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
