Optical waveguide tube
AssigneeBridgestone Corporation
InventorsMinoru Ishiharada, Hideo Sugiyama, Itsuo Tanuma
Life of this patent
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Abstract
An optical waveguide tube has a transparent core received in a cladding having a lower refractive index than the core. The entire cladding or an inner layer of the cladding fitting on the core is formed of a fluororubber which has been vulcanized by radical crosslinking. The vulcanized fluororubber has a residual halogen atom content of up to 80 ppm. A trapping agent surrounds the cladding for trapping coloring substances. The optical tube maintains satisfactory optical transmission capability over a long time while the core is not colored.
Claims32
An optical waveguide tube comprising a transparent core and a cladding having a lower refractive index than the core, characterized in that
- at least the inner surface of said cladding in contact with said core is formed of a fluororubber which has been vulcanized by radical reaction crosslinking and has a residual halide content of up to 80 ppm calculated as halogen atom;
- wherein after vulcanization, the fluororubber is subjected to solvent washing, heat treatment, vacuum treatment, or a combination thereof so that its residual halide content is up to 80 ppm calculated as halogen atom.
An optical waveguide tube comprising a transparent core and a cladding having a lower refractive index than the core, characterized in that
- at least the inner surface of said cladding in contact with said core is formed of a fluororubber which has been vulcanized by radical reaction crosslinking and has a residual halide content of up to 80 ppm calculated as halogen atom, which further includes a protective sheath surrounding said cladding with a coloring substance trapping agent being interposed between the protective sheath and said cladding.
An optical waveguide tube comprising a transparent core and a cladding having a lower refractive index than the core, characterized in that
- at least the inner surface of said cladding in contact with said core is formed of a fluororubber which has been vulcanized by radical reaction crosslinking and has a residual halide content of up to 80 ppm calculated as halogen atom, wherein said cladding comprises a coloring substance trapping agent.
An optical waveguide tube comprising a transparent core and a cladding having a lower refractive index than the core, characterized in that
- at least the inner surface of said cladding in contact with said core is formed of a fluororubber which has been vulcanized by radical reaction crosslinking and has a residual halide content of up to 80 ppm calculated as halogen atom, which further includes a cover layer surrounding said cladding and containing a coloring substance trapping agent.
An optical waveguide tube comprising a transparent core and a cladding having a lower refractive index than the core, characterized in that
- at least the inner surface of said cladding in contact with said core is formed of a fluororubber which has been vulcanized by radical reaction crosslinking and has a residual halide content of up to 80 ppm calculated as halogen atom, which further includes a coating layer of a coloring substance trapping agent surrounding said cladding and a cover layer surrounding the coating layer.
An optical waveguide tube comprising a transparent core and a cladding having a lower refractive index than the core, characterized in that
- at least the inner surface of said cladding in contact with said core is formed of a fluororubber which has been vulcanized by radical reaction crosslinking and has a residual halide content of up to 80 ppm calculated as halogen atom, wherein said cladding includes a rubber elastomer defining an inner surface and a layer of the vulcanized fluororubber inside the inner surface of the rubber elastomer.
Dependencies are inferred from the claim text.