The rapid increase of information technique requests the continuous increase of process speed and enlarged capacity for the communication devices

thus some traditional communication technologies and devices could not fulfill the demands of applications. Therefore

the research of low cost

large capacity and high speed devices for the current and future information processing and transmitting are imminent. During the process of the research

polar polymer electro-optic modulators have attracted many researchers because their particular properties such as large electro-optic coefficient

low dielectric constant

low cost

simple fabricating technologies and faster response. Many devices based on the polar polymer are applied in the areas of the optical communications and the optical inter connects of integrated circuits. Among them

electro-optic modulators are used not only to research the properties of the polymer materials

but also to achieve modulation array

in addition

electro-optic film modulators are important components in free space optical interconnection systems. Besides

the film modulator could decrease device size and be benefit to high speed package. In this paper

the electro-optic modulator utilizing a polar polymer film wa s reported. The polymer was epoxy-p-nitroaniline-cinnamy. After spin-coated onto the indium-tin oxide glass to form into optical quality films. The polymer was baked at 60℃ for 30min

and dried in a drier for 12h to remove residual solvent. Then the film was corona polar at 90℃ for 30min with 10kV poling volta ge and 5μA poling current. After the film was cooled down to room temperature

an electro-optic film was formed with thickness about 2μm. The polar polymer film was sandwiched between two indium-tin oxide electrodes and placed in a Fabry-Perot etalon. The Fabry-Perotcavity is utilized to convert the phase modulation to amplitude modulation by multiple reflection and interference properties as the direction of poling is paralleled to the propagating of probe laser beam. An electro-optic modulator measuring system was established based on Fabry-Perot cavity and polar polymer film. The principle and the characteristics of the sy s tem were analyzed in detail

the measurement and calculation of modulation depth were also talked about. The electric signals propagating on the indium-tin oxide coplanar waveguide electrodes were successfully detected by the polymer film modulator. The results show that the film has the linear electro-optic effect. The modulation depth of polar polymer film modulator reach 0.01% when the finess e of Fabry-Perot cavity is about 20 (for optical wavelength of 1.3 μm) and modulati ng electric field is 1V/μm. The results are promising for technical applications in high speed electro-optic modulator and its integration.