Abstract
An electro-optic intensity modulator consisting of a waveguide structure was fabricated using a novel urethane-urea copolymer that exhibited high second-order optical nonlinearity and superior temporal stability. Single-mode waveguides were defined by a photobleaching process, and then the electro-optic effect of the polymer was induced by corona poling. The intensity modulation for a propagation light at 830 nm was observed when AC voltage was applied. A half-wave voltage of Vπ=18 V was measured at 1 kHz using a modulator that had a 13-mm-long electrode, and the electro-optic coefficient (r33) was estimated to be 12 pm/V. The birefringence of the poled polymer and the r33 of the modulator depended on the poling voltage.
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