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Ferroelectric electro-optic modulator device comprising at least one supporting substrate or layer, at least one supporting oxide material or layer, at least one ferroelectric material or layer wherein the at least one ferroelectric material or layer includes or delimits at least one elongated waveguide core of at least one elongated waveguide, at least one intermediate layer comprising or consisting of at least one polycrystalline silicon layer or material provided or deposited between the at least one supporting oxide material or layer and the at least one supporting silicon substrate or layer, and a plurality of metal electrodes.