The authors synthesized new polymers containing a disperse red dye as the nonlinear optically active chromophore in conjunction with photocross-linkable groups. These polymers are soluble in many organic solvents and can be processed into thin films by spin-coating. With the corona poling method, large resonance enhanced second order nonlinear optical coefficients, (Chi) (2) of 250 pm/v for polymer 1 and 500 pm/v for polymer 2, were observed at 532 nm. It was found that introduction of flexible chains into the polymer backbone causes a decrease in glass transition temperature, Tg, and hence a decrease in the stability of the second order NLO effects. It was demonstrated that for polymer 2, (Chi) (2) values were stable at ca 90% of their maximum values up to 1200 hr after electrical poling. These polymers show a large refractive index change caused by cis-trans isomerization of azo groups when exposed to UV light. This large refractive index change has been utilized in the fabrication of channelized waveguide structures.