Optical Beam Steering Using an NxN Phased Array with 2N Phase Shifters

Ashtiani, Farshid; Aflatouni, Firooz

doi:10.1364/cleo_si.2020.sm1o.1

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…For instance, to address the interconnect density challenge, complex and costly electrical interconnect solutions such as through-silicon via (TSV) [14], monolithic platforms [15], or large-scale chip-to-chip interposers are investigated [16]. Alternatively, full wavefront control can be sacrificed with architectures that can only do simple beamforming to reduce the interconnect density challenges [15,17,18].…”

Section: Introductionmentioning

confidence: 99%

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

Khachaturian¹,

Fatemi²,

Hajimiri³

2021

Preprint

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Integrated photonic active beamforming can significantly reduce the size and cost of coherent imagers for LiDAR and medical imaging applications. In current architectures, the complexity of photonic and electronic circuitry linearly increases with the desired imaging resolution. We propose a novel photonic transceiver architecture based on co-prime sampling techniques that breaks this trade-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-𝑁 radiating elements, this architecture achieves beamwidth and side-lobe level (SLL) performance equivalent to a transceiver with order-of-𝑁 2 elements with half-wavelength spacing. Furthermore, we incorporate a pulse amplitude modulation (PAM) row-column drive methodology to reduce the number of required electrical drivers for this architecture from order of 𝑁 to order of √ 𝑁. A silicon photonics implementation of this architecture using two 64-element apertures, one for transmitting and one for receiving, requires only 34 PAM electrical drivers and achieves a transceiver SLL of −11.3 dB with 1026 total resolvable spots, and 0.6 • beamwidth within a 23 • × 16.3 • FOV.

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Section: Introductionmentioning

confidence: 99%

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

Khachaturian¹,

Fatemi²,

Hajimiri³

2021

Preprint

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“…Integrated solid-state photonic beamformers (optical phased arrays or OPAs) have the potential to reduce the cost, size, and implementation complexity of many photonic systems compared to their bulk optics and MEMS counterparts [1,2]. These solid-state beamformers have been recently demonstrated for LiDAR [3,4], photonic beam steering [5][6][7], medical imaging [8], and remote sensing [9] applications. In particular, standard silicon photonics processes can further reduce the cost and increase the yield and reliability of such systems [6,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Discretization of Annular-Ring Diffraction Pattern for Large-Scale Photonics Beamforming

Khachaturian¹,

Fatemi²,

Darbinian³

et al. 2021

Preprint

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A solid-state active beamformer based on the annular-ring diffraction pattern is proposed for an integrated photonic platform. Such a circularly symmetric annular-ring aperture achieves radiating element limited FOV. Furthermore, it is demonstrated that a multi-annular-ring aperture with a fixed linear density of elements maintains the beam efficiency for larger apertures while reducing the beamwidth and side-lobe-level (SLL). A 255-element multi-annular-ring OPA with active beamforming is implemented in a standard photonics process. 510 phase and amplitude modulators enable beamforming and beam steering using this aperture. A row-column drive methodology reduces the required electrical drivers by more than a factor of 5.

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2D leaky-wave antenna with controlled direction of radiation in the azimuthal plane

Machac,

Svanda,

Kabourek

2024

Int. J. Microw. Wireless Technol.

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This paper presents a two-dimensional (2D) metasurface antenna array composed of mushroom cells coupled by thin slots in the top metallization. The antenna is fed through power dividers designed in substrate-integrated waveguide technology. The antenna structure is therefore designed in a fully up-to-date integrated version. The array shows beam steering in the azimuthal plane controlled by signal amplitudes fed into particular ports at the edges of the matrix. The main advantage of this antenna is no need to use phase shifters applied in standard 2D antenna arrays. Two antenna versions have been designed, fabricated, and experimentally tested. The beam can be steered within 360° (90°) in azimuth. The steering of the beam in elevation from backward to forward directions within 40° is done by changing frequency from 21 up to 23.8 GHz. This interval is reduced to 30° by exciting the antenna simultaneously at two adjacent ports at the same amplitude.

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Optical Beam Steering Using an NxN Phased Array with 2N Phase Shifters

Abstract: A novel NxN optical phased array (OPA) with 2N phase shifters is proposed that significantly reduces power consumption and enables OP As with compact element spacing. 2-D beam steering with an 8x8 OP A using the proposed scheme is demonstrated.

Cited by 4 publications

References 5 publications

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

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

Discretization of Annular-Ring Diffraction Pattern for Large-Scale Photonics Beamforming

2D leaky-wave antenna with controlled direction of radiation in the azimuthal plane

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