Serially grafted optical waveguide fabrication of NLO polyimide and transparent polymers

We have investigated polymers suitable for fabricating serially grafted optical waveguide with nonlinear optical (NLO) polyimide (PI). UV cured epoxy resins were appropriate not only as a cladding layer for the NLO PI but also as a core layer of the grafted waveguide. By using NLO PI as an active core layer and the UV cured epoxy resins as a passive core layer, serially grafted waveguide was fabricated. The scattering loss of the serially grafted points was relatively small. The serially grafted waveguide is applicable to many types of practical optical circuits.