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In this paper the authors have demonstrated the feasibility and the realization of a wavelength tunable filter with an electro-optic modulation effect realized on diffused Ti: LiNbO 3 waveguide. The two reflectors of the cavity consist in two Bragg׳ s mirrors of identical period Λ= 1.81 μ m and whose total number N= 140. Both mirrors have been engraved using the Focused Ion Beam technique up to the depths l 1= l 2= 2.7 μ m separated by a distance of l c= 500 μ m. We obtained thanks to electro-optic modulation effect a tunable shift whose value is 0.67 nm in a free spectral range FSR= 1.59 nm for a voltage variation up to 60 V. This designed and realized probe will find many DWDM (Dense Wavelength Division Multiplexing) applications.