Photodefinable optical waveguides
AssigneeAmoco Corporation
InventorsAllyson J. Beuhler, David A. Wargowski
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Abstract
Polyimide optical waveguide structures comprising a core within a cladding wherein at least one of the core and the cladding is a polyimide containing 6FDA, BTDA, an aromatic diamine having bulky methyl groups ortho to the amine, and a co-diamine wherein the polyimides have the properties of low optical loss, low optical absorbance, controllable refractive index, and high thermal stability, and wherein the polyimides are photosensitive and solvent resistant.
Claims14
A photodefinable optical waveguide comprising a core material within a cladding material wherein at least one of the core material and the cladding material comprises a copolyimide having the repeating units ##STR4## and from about 0.1 mole % to about 30 mole % ##STR5## wherein R and R.sub.1 are selected from a group consisting of at least one of an aromatic diamine moiety having bulky methyl groups ortho to the amine, and a co-diamine moiety;
- or the polyamic acid, salts, or polyester precursors therefor;
- wherein the photosensitivity of the polyimide is less than about 1,000 mJ/cm.sup.2, the birefringence is from about minus 0.25 to about plus 0.25, and wherein the refractive index of the core is greater than the cladding.
Dependencies are inferred from the claim text.