Optical interposer for waveguides

A subassembly comprising:

• an optical interposer comprising at least
• a substrate having a top planar surface:
• at least one groove defined in said top planar surface and extending from an edge of said substrate to a terminal end, said groove having side walls and a first facet at said terminal end perpendicular to said side walls, said first facet having a first angle relative to said planar surface;
• a reflective coating on said first facet;
• a polymeric optical conduit disposed in said groove and extending to said edge, said polymeric optical conduit having a core defining an optical axis, and an end face with at least a first mating facet having essentially said first angle relative to its optical axis such that said first mating facet and said first facet contact each other;
• and
• an optical component having an optical axis perpendicular to said top planar surface, said optic component being disposed on said top planar surface at said terminal end such that its optical axis is disposed over said first facet such that said optical component is optically coupled with said core of said polymeric optical conduit;
• and
• a waveguide optically coupled to said polymeric optical conduit at said edge, wherein said polymeric optical conduit and said waveguide are integrally formed.