Integrated optical intensity modulator and method for fabricating the same

TLDR: In this paper, an integrated optical intensity modulator and a method for fabricating the same are provided, which includes a substrate having spontaneous polarization, cut in a predetermined direction, an optical waveguide formed on the substrate, a plurality of domain-inversion areas having domains in the reverse direction of the spontaneous polarization arranged in a staggered pattern around the optical waveguide, and a first electrode formed on a optical-waveguide and second and third electordes forming on the substrates on the right and left of the optical-guide, wherein if a predetermined voltage is applied to

Abstract: An integrated optical intensity modulator and a method for fabricating the same are provided. The integrated optical intensity modulator includes a substrate having spontaneous polarization, cut in a predetermined direction, an optical waveguide formed on the substrate, a plurality of domain-inversion areas having domains in the reverse direction of the spontaneous polarization, arranged in a staggered pattern around the optical waveguide, and a first electrode formed on the optical waveguide and second and third electordes formed on the substrates on the right and left of the optical waveguide, wherein if a predetermined voltage is applied to the electrode, a light wave is deflected and scattered in a domain-inversion area in accordance with a change of the refractive index of thedomain-inversion area in the optical waveguide and the refractive index of the spontaneous polarization area. According to the optical intensity modulator of the present invention, the domain-inversion structure of a ferroelectric material isformed in a staggered pattern around the optical waveguide, and an optical guided mode is deflected by an applied voltage, to thereby half driving voltage of the optical waveguide, and an area for deflecting the optical guided mode to the right and left can be formed in multiple stages, to thereby increase the extinction ratio.