C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/8.8
C03B 37/018 (2006.01) C03B 37/012 (2006.01) C03B 37/014 (2006.01) C03B 37/027 (2006.01) C03C 13/04 (2006.01)
Patent
CA 1294438
Abstract: The present invention relates to a glass preform for use in the fabrication of a dispersion shifted single mode optical fiber. The preform is produced by a method comprising steps of inserting a core member consisting of an inner core part made of a germanium-added quartz glass which optionally contains fluorine and an outer core part made of a quartz glass having a refractive index smaller than that of the inner core part into a glass tube made of a fluorine-added quartz glass having a refractive index smaller than that of the outer core part. The method further comprises heating the core member and the glass tube to collapse the glass tube and fuse them together to produce a glass preform. The invention further comprises a glass preform comprising a core member consisting of an inner core part made of GeO2-SiO2 glass or GeO2-F-SiO2 glass and an outer core part made of F-SiO2 glass and a cladding made of F-SiO2 glass. This preform produces a dispersion shifted single mode optical fiber having reduced attenuation of light transmission in the 1.5 µm wavelength band.
539353
Ishiguro Yoichi
Kanamori Hiroo
Shigematsu Masayuki
Suganuma Hiroshi
Takagi Masahiro
Kirby Eades Gale Baker
Sumitomo Electric Industries Ltd.
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