Electro-optic modulation has been first demonstrated using a poled electro-optic polymer films, placed in a Fabry-Perot cavity. In our configuration, incorporating an electro-optic material in the spacer layer of a Fabry-Perot device creates such a structure whose optical transmission characteristics depend on the applied voltage. And the longitudinal electro- optic modulation, in which the direction of the poling electric field, the applied electric field and the light traveling are parallel with one another and perpendicular to the surface of the polymer film, is applied. According to the electro-optic tensor of a poled polymer film, there is no birefringence effect and only phase modulation of the light is produced. Considering the interferometric nature of the Fabry- Perot cavity, the phase modulation can be converted to the amplitude modulation. The cavity used had a finesse of about 20. The thickness of film is about 1 micrometers . The modulation depth achieved was about 0.07% for a low ac field of 1V/micrometers . The results are promising for the study of array modulation and optical interconnection.
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