Temperature stable polymer optical waveguides have been realised and integr
ated into printed circuit boards (PCBs). A special waveguide fabrication pr
ocess has been developed which is compatible with standard PCB processing t
echnologies. Multimode waveguides with a 100 x 100 mu m(2) cross-section ha
ve been produced by hot embossing thin polymer foils. Embedding of the wave
guide foils into multilayer PCBs has led to a hybrid electrical-optical cir
cuit board solution.