Patent ID: 7569335

Claim:
An optical waveguide comprising a lower clad layer, a core portion, and an upper clad layer, wherein at least one of the lower clad layer, the core portion, and the upper clad layer comprises a cured material of a photosensitive resin composition comprising: (A) a polymer comprising structures represented by the following general formulae (1) and (2) (in the formulae, each of R 1 and R 2 is independently a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, R 3 is an organic group containing a radical-polymerizable reactive group, X is a single bond or a bivalent organic group, and Y is a non-polymerizable organic group); (B) a compound comprising at least one ethylenic unsaturated group, having a molecular weight below 1,000 and having a boiling point of at least 130° C. at 0.1 MPa; and (C) a photoradical polymerization initiator.