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Abstract
We propose and experimentally demonstrate a monolithically integrated $1\times 4$ reconfigurable electro-optic tunable interleaver in X-cut lithium niobate thin film by cascading three asymmetrical Mach-Zehnder interferometers into two stages. Over a wide wavelength range from 1530 nm to 1605 nm, our fabricated device exhibits polarization-insensitive center wavelengths and channel spacing of ~50 GHz, slightly different switching voltages of 4.5 V and 6.7 V, and extinction ratios of 8–15 dB and 7–13 dB for the transverse electric (TE) and the transverse magnetic (TM) polarized input light, respectively.
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