Method of producing an optical fiber preform from a plurality of

Details Method of producing an optical fiber preform from a plurality of Method of producing an optical fiber preform from a plurality of

1995-10-10

1997-12-30

Hoffmann, John

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

Process of manufacturing optical fibers, waveguides, or...

65417, C03B 37027

Patent

active

057024979

ABSTRACT:
Disclosed is an optical fiber capable of preventing an increase in an optical loss from occurring during fabrication and extraction of a single mode fiber preform and enhancement of an optical transmission efficiency, a method of producing the same comprising the steps of forming a first quartz robe having a first thermal conductivity, said first quartz tube being used as a clad; depositing a core layer and a clad layer inside the first quartz robe to form a preliminary perform by heating of the fist quartz robe; forming a second quartz tube having a second thermal conductivity lower than the first thermal conductivity; and depositing the second quartz tube to said preliminary preform by heating to produce the optical fiber preform. On embodiment, uses N overclad layers having thermal conductivites K.sub.x such that K.sub.0 >K.sub.1 >K.sub.2 . . . >K.sub.N and coefficients of viscosity .mu..sub.0 <.mu..sub.1 <.mu..sub.2 . . . <.mu..sub.N.

REFERENCES:
patent: 4978377 (1990-12-01), Brehm
Optical Fiber Communication, Feb. 20-25, 1994 vol. 4, 1994 Technical Digest Series, Conference Edition pp. 1-2.
Heat Transfer, Seventh Edition in Si Units by J.P. Holman, McGraw-Hill Book Company, (pp. 151-155) No date.

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