Patent ID: 8586286

Claim:
An optical waveguide, comprising: a substrate; a cladding layer provided on the substrate; and a core portion provided in the cladding layer for transmitting an optical signal; wherein the core portion is formed from a resin composition comprising: (A) an alkali soluble resin, having a structural unit represented by the following general formula (1): wherein R 1 , R 2 and R 3 , which may be the same or different, are each a hydrogen atom or a methyl group; wherein R 5 and R 6 , which may be the same or different, are each a hydrogen atom or a methyl group; wherein R 4 is and wherein in the entirety of the alkali soluble epoxy resin (A), m+n+p=1, m>0, n>0 and p>0; and (B) a photopolymerization initiator.