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Integrated photonic active beamforming can significantly reduce the size andcost of coherent imagers for LiDAR and medical imaging applications. In currentarchitectures, the complexity of photonic and electronic circuitry linearlyincreases with the desired imaging resolution. We propose a novel photonictransceiver architecture based on co-prime sampling techniques that breaks thistrade-off and achieves the full (radiating-element-limited) field-of-view (FOV)for a 2D aperture with a single-frequency laser. Using only order-of-Nradiating elements, this architecture achieves beamwidth and side-lobe level(SLL) performance equivalent to a transceiver with order-of-N-squared elementswith half-wavelength spacing. Furthermore, we incorporate a pulse amplitudemodulation (PAM) row-column drive methodology to reduce the number of requiredelectrical drivers for this architecture from order of N to order of squareroot of N. A silicon photonics implementation of this architecture using two64-element apertures, one for transmitting and one for receiving, requires only34 PAM electrical drivers and achieves a transceiver SLL of -11.3dB with 1026total resolvable spots, and 0.6 degree beamwidth within a 23x16.3 degree FOV.

Achieving Full Grating-Lobe-Free Field-of-View with Low-Complexity Co-prime Photonic Beamforming Transceivers