| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cost-efficient MCVD process which highly reproducibly and controllably forms a GI MM fiber glass layer having a reduced rippling structure suitable for high bandwidth application and a desired near-parabolic refractive-index profile. <P>SOLUTION: The MCVD process reduces the rippling structure in the refractive-index profile of a graded-index, multiple-mode optical fiber by incorporating N<SB>2</SB>O, CO, or NF<SB>3</SB>in the gas stream during deposition of a soot partial layer from which the optical fiber is formed. The soot partial layer is sintered to form a glass partial layer during deposition of a subsequent soot partial layer. A dopant species is incorporated in each soot partial layer during deposition. Fibers made from the doped glass partial layers have a graded refractive-index profile that is near-parabolic in shape and have significantly reduced rippling compared to profiles observed for fibers prepared conventionally. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
