Title: Method of treating preform for optical fiber
Application Number: 86100210 Application Date: 1986.01.14
Publication Number: 1003052 Publication Date: 1986.09.10
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C03B37/01
Applicant(s) Name: Koga Electric Industrial Co ltd. (JP) Osaka Japan Address:
Inventor(s) Name: Hoshi iino;Houhiroi Matsubara;Kio Ogai;Yoshi Koi
Attorney & Agent: SHEN ZHAONAN
Abstract:
    A method for treatment of preform optical fiber having a transmitting characteristic at 1.2 to 1.6 micron wavelength 5dB/km or less. The porous silica preform is dehydrated, thereafter transparently vitrified separately from the dehydrating step. This method can produce an optical fiber material that does not exhibit a peak of increased loss due to the discovery in 1.52 micron of wavelength.
Time: 8