Optical waveguides – With optical coupler
Patent
1990-10-01
1992-10-06
Epps, Georgia
Optical waveguides
With optical coupler
385115, 385141, 385 53, 385 55, G02B 626, G02B 636
Patent
active
051539322
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 becuase 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.
REFERENCES:
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patent: 4021098 (1977-05-01), McCartney
patent: 4295470 (1981-10-01), Show et al.
patent: 4341439 (1982-07-01), Hodge
patent: 4416285 (1983-11-01), Show et al.
patent: 4952022 (1990-08-01), Genovese
patent: 4978186 (1990-12-01), Mori
Blyler, Jr. Lee L.
Grimes Gary J.
Haas Lawrence J.
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