Abstract
We propose an electro-optic mode switch based on an optical waveguide Mach-Zehnder interferometer fabricated with x-cut lithium niobate by the annealed proton exchange process. The device can switch between the fundamental mode and the higher-order mode with a low driving voltage. Our typical fabricated device, which has a total length of ∼24 mm, shows a mode extinction ratio of ∼35 dB and a 20-dB bandwidth of ∼12 nm at the wavelength 1552nm, when driven at a voltage of 1.7V at 26°C. High performance can be obtained at any wavelength in the C+L band with a driving voltage varying by no more than 3V. The proposed mode switch is easy to fabricate and could find applications in reconfigurable mode-division-multiplexing systems.
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