Method of forming an optical fiber preform

Details Method of forming an optical fiber preform Method of forming an optical fiber preform

1985-01-25

1988-06-07

Bashore, S. Leon

Glass manufacturing

Processes

Forming product or preform from molten glass

65 32, 65 181, C03C 2502, C03B 1909

Patent

active

047493968

ABSTRACT:
An improved method of forming an optical fiber preform includes separately forming a rod-like inner member and a hollow tube-like outer member by a soot glass deposition technique. The inner member is inserted into the outer member, while they are both in their unconsolidated state, and the asssembled parts heated to cause the outer member to collapse about the inner member and form a preform. The resulting preform can be drawn in one or more stages to provide an optical fiber having sharp step change in its index of refraction between the core and the cladding, a superior quality core to cladding interface, and improved optical transmission qualities. The inner and outer members can, if desired, be partially consolidated but for an unconsolidated layer at their interface prior to heating the outer member to cause it to join with the inner member. In accordance with one feature of the present invention, an unconsolidated layer can be left on the outside surface of the outer member to provide a resulting fiber having superior mechanical handling characteristics.

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