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An electro-optic tunable lithium-niobate (LN) waveguide Mach-Zehnder interferometer (MZI) is designed and fabricated with the annealed proton-exchange process. The MZI consists of a straight waveguide arm and a bent waveguide arm with a SiO2 film deposited on the two sides. The residual stress generated by the SiO2 film can enhance the index contrast of the bent waveguide arm and thus reduce the bending...
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