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Crosstalk in Ti:LiNbO3directional coupler switches caused by Ti concentration fluctuations

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2 Author(s)

We have observed random fluctuations in the local Ti concentration profiles of Ti-diffused LiNbO3waveguides. Calculations show that these variations explain the degraded switch extinction ratio (i.e., crosstalk) and other nonideal characteristics observed in LiNbO3optical switches. We also demonstrate by calculation a new device configuration for eliminating this source of crosstalk.

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Quantum Electronics, IEEE Journal of  (Volume:22 ,  Issue: 6 )