Title:
PROCESS FOR PRODUCING OPTICAL-FIBER BASE MATERIAL
Document Type and Number:
WIPO Patent Application WO/2010/029734
Kind Code:
A1
Abstract:
Provided is a process for producing an optical-fiber base material which can give an optical fiber having a trench type refractive index profile, low transmission loss, low loss of splicing to a standard single-mode optical fiber, and satisfactory flexing resistance. The process is for producing an optical-fiber base material comprising at least a core, a first clad, and a second clad, which contains fluorine. The process is characterized by including: a starting-base-material preparation step in which a starting base material comprising a core and a first clad is prepared; a plasma deposition step in which a raw glass material is fed to a high-frequency induction thermal-plasma torch to synthesize fine glass particles, and the particles are deposited on the base material to produce a porous intermediate glass base material; and a step in which the porous intermediate glass base material is heated and vitrified in a fluorine-containing atmosphere to form an intermediate glass base material which comprises a core, a first clad, and a second clad, which contains fluorine.
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Inventors:
OTOSAKA TETSUYA (JP)
Application Number:
PCT/JP2009/004466
Publication Date:
March 18, 2010
Filing Date:
September 09, 2009
Export Citation:
Assignee:
SHINETSU CHEMICAL CO (JP)
OTOSAKA TETSUYA (JP)
OTOSAKA TETSUYA (JP)
International Classes:
C03B37/018; C03B37/014
Foreign References:
| JP2007045643A | 2007-02-22 | |||
| JP3853833B2 | 2006-12-06 | |||
| JP2007279739A | 2007-10-25 | |||
| JP2007048514A | 2007-02-22 | |||
| JP2003226539A | 2003-08-12 |
Other References:
See also references of EP 2351715A4
Attorney, Agent or Firm:
RYUKA IP LAW FIRM (JP)
Ryuka international patent business corporation (JP)
Ryuka international patent business corporation (JP)
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