Glass preform for dispersion shifted single mode optical fiber a

Details Glass preform for dispersion shifted single mode optical fiber a Glass preform for dispersion shifted single mode optical fiber a

1987-06-10

1989-04-18

Schor, Kenneth M.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 182, 65900, 65DIG16, C03B 37018

Patent

active

048223999

ABSTRACT:
A glass preform for use in the fabrication of a dispersion shifted single mode optical fiber is produced by a method for 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 in a glass tube made of a fluorine-added quartz glass having a refractive index smaller than that of the outer core part, heating the core member and the glass tube to collapse the glass tube and fuse them together to produce a glass perform. The glass preform comprises a core member consisting of an inner core part made of GeO.sub.2 -SiO.sub.2 glass or GeO.sub.2 -F-SiO.sub.2 glass and an outer core part made of F-SiO.sub.2 glass and a cladding made of F-SiO.sub.2 glass and provides a dispersion shifted single mode optical fiber having reduced attenuation of light transmission in the 1.5 .mu.m wavelength band.

REFERENCES:
patent: 3933454 (1976-01-01), Deluca
patent: 4165915 (1979-08-01), Rau
patent: 4283213 (1981-08-01), Akers
patent: 4306767 (1981-12-01), Kawachi
patent: 4310339 (1982-01-01), Blankenship
patent: 4620861 (1986-11-01), Berkey
patent: 4629485 (1986-12-01), Berkey
patent: 4675038 (1987-06-01), Ainslie

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