Patent ID: 7615130

Claim:
A method of forming a printed circuit board having optical functionality, comprising: (a) providing a first, printed circuit board substrate; (b) forming an optical waveguide structure comprising a clad and a core structure on a second substrate, separate from the printed circuit board substrate, wherein the optical waveguide structure comprises a polymer comprising units of the formula (R 1 SiO 1.5 ), wherein R 1 is a substituted or unsubstituted organic group, comprising: forming a first clad layer on the second substrate; forming on the first clad layer a core layer from a composition comprising: units of the formula (R 1 SiO 1.5 ) and a plurality of functional end groups; and a first component for altering the solubility of the composition upon exposure to actinic radiation; exposing a portion of the core layer to actinic radiation; developing the core layer, thereby forming the core structure; and forming a second clad layer on the first clad layer and core structure; (c) separating the optical waveguide structure from the second substrate; and (d) affixing the optical waveguide structure to the printed circuit board substrate.