Digitally Controlled Phase Shifter Using an SOI Slot Waveguide With Liquid Crystal Infiltration


We demonstrate a section shifter employing a silicon slot waveguide infiltrated with liquid crystal. For a 1-mm long device we have a tendency to achieve $73pi $ phase shift with a 5 V voltage, with a voltage-length product of 0.0224 $textVcdot $ mm $sim 1$ V. We drive the phase shifter with a digital 1 V, duobinary pulsewidth-modulated signal, or a one V frequency-modulated signal. This enables direct digital CMOS management of an analog optical phase shifter.

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