Patent ID: 6885780

Claim:
An electro-optic device comprising: a substrate including an optical waveguide formed in an upper surface thereof; a plurality of electrically floating electrode segments that are positioned on the substrate to intensify an electric field in the optical waveguide; a RF ground electrode that is positioned on the substrate proximate to the optical waveguide, the RF ground electrode including a slot defining a grounded section for interrupting the continuity of induced electrical current in the RF ground electrode, and suppressing modal conversion and propagation of high order modes in the RF ground electrode and the plurality of electrically floating electrode segments, thereby suppressing modal coupling to the substrate which reduces high frequency loss in the substrate; a buffer layer that is formed on the substrate, on the plurality of electrically floating electrode segments, and in the slot; and a driving electrode that is formed on the buffer layer, the driving electrode being adapted to receive a RF signal that induces the electric field in the optical waveguide.