Generation of CW millimeter wave signals in a lithium niobate nonlinear optical waveguide using modulated optical input

The generation of CW millimeter wave signals is observed in a LiNbO3 nonlin ear optical waveguide. Optical light that has two frequency components is i ntroduced into an optical waveguide, and the millimeter waves which are gen erated are obtained from the terminal connected to the metallic traveling w aveguide. This configuration is made with a LiNbO3 commercial phase modulat or. Millimeter waves are generated at frequencies up to 40 GHz. This is the first report of CW millimeter wave generation in a nonlinear ferroelectric waveguide, to our knowledge. A comparison of the measured signal levels wi th theoretically estimated ones is discussed.