An eight-layer silicon optical phased array uses passive delay lines and wavelength tuning to steer a beam in two orthogonal directions without grating couplers.
High-efficiency end-fire 3d optical phased array based on a multi-layer si3n4/sio2 platform,
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Dual-Axis Beam-Steering OPA with purely Passive Phase Shifters
An eight-layer silicon optical phased array uses passive delay lines and wavelength tuning to steer a beam in two orthogonal directions without grating couplers.