Optical phased array with on-chip phase calibration

Optical phased arrays (OPAs) with phase-monitoring and phase-control capabilities are necessary for robust and accurate beamforming applications. This paper demonstrates an on-chip integrated phase calibration system where compact phase interrogator structures and readout photodiodes are implemented...

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Veröffentlicht in:Optics letters 2022-12, Vol.47 (23), p.6081-6084
Hauptverfasser: Prost, Mathias, Kjellman, Jon Øyvind, Dwivedi, Sarvagya, Marinins, Aleksandrs, Tyagi, Hemant Kumar, Kongnyuy, Tangla David, Soussan, Philippe, Dahlem, Marcus S, Rottenberg, Xavier, Jansen, Roelof
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container_end_page 6084
container_issue 23
container_start_page 6081
container_title Optics letters
container_volume 47
creator Prost, Mathias
Kjellman, Jon Øyvind
Dwivedi, Sarvagya
Marinins, Aleksandrs
Tyagi, Hemant Kumar
Kongnyuy, Tangla David
Soussan, Philippe
Dahlem, Marcus S
Rottenberg, Xavier
Jansen, Roelof
description Optical phased arrays (OPAs) with phase-monitoring and phase-control capabilities are necessary for robust and accurate beamforming applications. This paper demonstrates an on-chip integrated phase calibration system where compact phase interrogator structures and readout photodiodes are implemented within the OPA architecture. This enables phase-error correction for high-fidelity beam-steering with linear complexity calibration. A 32-channel OPA with 2.5-µm pitch is fabricated in an Si-SiN photonic stack. The readout is done with silicon photon-assisted tunneling detectors (PATDs) for sub-bandgap light detection with no-process change. After the model-based calibration procedure, the beam emitted by the OPA exhibits a sidelobe suppression ratio (SLSR) of -11 dB and a beam divergence of 0.97° × 0.58° at 1.55-µm input wavelength. Wavelength-dependent calibration and tuning are also performed, allowing full 2D beam steering and arbitrary pattern generation with a low complexity algorithm.
doi_str_mv 10.1364/OL.467779
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source Optica Publishing Group Journals
subjects Algorithms
Beam steering
Beamforming
Calibration
Complexity
Energy gap
Error correction
Pattern generation
Phased arrays
Photodiodes
Sidelobe reduction
Sidelobes
Silicon
title Optical phased array with on-chip phase calibration
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