Method of thermoforming an optical fiber end

Details Method of thermoforming an optical fiber end Method of thermoforming an optical fiber end

1993-07-26

1994-09-13

Vargot, Mathieu

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Optical fiber, waveguide, or preform

264 27, 264296, 264322, 264325, 264DIG65, 264DIG66, 385121, 425392, 425DIG41, B29C 5118, B29D 1100

Patent

active

053466551

ABSTRACT:
An optical coupler using round optical fibers whose ends have been formed into a predefined shape to allow greater physical packing densities in order to achieve greater uniform illumination efficiency. The interstitial space between optical fibers is greatly reduced by thermoforming the ends of round optical fibers in a mold that makes a gradual transition from a circular shape to the predefined shape to avoid optical loss. Since the change in shape is gradual, the total cross-sectional area of the fibers remains constant; and optical loss is minimal because there is no reduction in mode volume. The predefined shape may be substantially square or rectangular. The core and cladding materials of the optical fiber are carefully chosen with respect to the glass transition state temperatures of both materials because the temperature at which the materials are formed by a mold are slightly above the glass transition state of the core or cladding, whichever is higher.

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