Title:
OPTICAL FIBER FOR COMMUNICATION AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3434428
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an induced Brillouin scattering suppression optical fiber which is easily manufactured and has low optical loss and high strength.
SOLUTION: A boron doped layer 4 mixed with boron as a dopant changing linear expansion coefficient of qurtz glass is formed in a clad 9 at an outer peripheral side than a mode field radius formed at an outer peripheral side of an optical fiber core 8. The boron doped layer 4 is made to be a layer having a cross section of a doughnut shape and pernodically changing layer thickness in the longitudinal direction of the optical fiber. Therefore, the optical fiber has a boron dopant concn. periodically changed in the longitudinal direction of the optical fiber. Residual stress is imparted to the core 8 by the boron doped layer 4 and stress impartment to the core 8 is periodically changed in the longitudinal direction of the optical fiber and thereby characteristic of the optical fiber is changed in the longitudinal direction of the optical fiber to suppress the generation of induced Brillouin scattering.
Inventors:
Kunio Ogura
Youichi Akasaka
Masaharu Ohashi
Katsusuke Tajima
Youichi Akasaka
Masaharu Ohashi
Katsusuke Tajima
Application Number:
JP31554896A
Publication Date:
August 11, 2003
Filing Date:
November 12, 1996
Export Citation:
Assignee:
THE FURUKAW ELECTRIC CO.,LTD.
Nippon Telegraph and Telephone Corporation
Nippon Telegraph and Telephone Corporation
International Classes:
G02B6/00; C03B19/01; C03B37/014; C03B37/018; C03C13/04; G02B6/02; (IPC1-7): G02B6/10; C03B19/01; C03B37/018; C03C13/04; G02B6/00
Domestic Patent References:
| JP5249329A | ||||
| JP9218319A | ||||
| JP763922A | ||||
| JP7287131A | ||||
| JP4367539A |
Other References:
【文献】白木和之(外2名),SBS抑制ファイバの特性,1994年電子情報通信学会秋季大会-ソサイエティ先行大会-講演論文集 エレクトロニクス1,日本,(社)電子情報通信学会,1994年 9月 5日,pp.137(C-137)
Attorney, Agent or Firm:
Kiyoshi Igarashi
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