Optical fiber preform

Details Optical fiber preform Optical fiber preform

2001-09-12

2003-04-01

Ullah, Akm E. (Department: 2874)

Optical waveguides

Optical fiber waveguide with cladding

C065S157000, C065S412000, C385S147000

Reexamination Certificate

active

06542680

ABSTRACT:

BACKGROUND OF THE INVENTION
Traditionally, an optical fiber preform has been manufactured by utilizing techniques of VAD (Vertical Axis Deposition), OVD (Outer Vapor Deposition) or MCVD (Modified CVD). The optical fiber preform is fiber-drawn to manufacture optical fibers. Recently, in order to enhance the production of optical fibers and to reduce manufacturing costs there were some tries to upsize the preform. It was upsized to increase the length of optical fibers to be manufactured out of the optical fiber preform.
SUMMARY
In one aspect, the invention is to provide the following optical fiber preform. That is, the optical fiber preform comprises of:
a target rod which will be the core of the optical fiber, and
a glass layer formed around the circumference of the target rod,
wherein the optical fiber preform is formed to be an optical fiber preform having an outer diameter of 10 cm or more, and
a mass of the optical fiber preform and a diameter of the target rod will satisfy a relational expression, 0.4·(W)½<D, where the mass of the optical fiber preform is set as W (kg) and the diameter of the target rod is set as D (cm).


REFERENCES:
patent: 4345928 (1982-08-01), Kawachi et al.
patent: 4406684 (1983-09-01), Kawachi et al.
patent: 4822399 (1989-04-01), Kanamori et al.
patent: 4969941 (1990-11-01), Kyoto et al.
patent: 5259856 (1993-11-01), Ohga et al.

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