The shift of the mode-conversion wavelength has been measured by applying a tuning voltage between the
top and bottom electrodes.The tunability in the LiNbO3 waveguide can be estimated from the measured tuning, 0.13 nm=V, considering the oxide buffer and an air gap between the waveguide and the top electrode. This estimate shows a tunability of 0.26 nm=V, which is 3 larger than previously reported for a conventional bulk device .For a realistic device design with a 1 mm-thick oxide buffer directly on the waveguide, the tuning voltage in a thin-film device can be calculated to be 0.2 nm=V, which makes it possible to switch a 10 GHz spacing channel with <5 V.
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