Title:
【発明の名称】石英ガラス系高強度光ファイバおよびその製造方法
Document Type and Number:
Japanese Patent JP2855531
Kind Code:
B2
Abstract:
PURPOSE:To increase the refractive index of a surface strengthening layer higher than the refractive index of a clad and to eliminate the propagation of multimodes by drawing a perform under the drawing tension under which the refractive index of the strengthening layer attains the refractive index equal to or higher than the refractive index of the clad. CONSTITUTION:Fluorine is doped into the surface strengthening layer of the high-strength fiber of a quartz system consisting of the core/clad/surface strengthening layer to lower the softening temp. to the temp. lower than the softening temp. of the clad and to allow compressive stresses to remain so that the refractive index is equal to or higher than the refractive index of the clad. The transmission characteristic of this fiber is not the propagation to accompany the multimodes but the perfect single mode in this way and the propagation of the multimodes is eliminated. The breaking strength which compares favorably with the breaking strength of the conventional high-strength fibers is obtd.
Inventors:
OOCHI YOSHIHIRO
SAKAI TETSUYA
TOMITA SHINICHI
WADA AKIRA
YAMAUCHI RYOZO
SAKAI TETSUYA
TOMITA SHINICHI
WADA AKIRA
YAMAUCHI RYOZO
Application Number:
JP27726389A
Publication Date:
February 10, 1999
Filing Date:
October 26, 1989
Export Citation:
Assignee:
FUJIKURA KK
International Classes:
G02B6/00; C03B37/027; G02B6/44; (IPC1-7): G02B6/44; C03B37/027; G02B6/00; G02B6/44
Domestic Patent References:
| JP5662204A | ||||
| JP641415B2 |
Attorney, Agent or Firm:
Takeuchi Mamoru