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Time and frequency -Domain Interpretation of Phase-lead Control01:24

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Related Experiment Video

Updated: Jun 5, 2025

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Optimization of a programmable λ/2-pitch optical phased array.

Ankita Sharma1,2, John N Straguzzi1, Tianyuan Xue1,2

  • 1Max Planck Institute of Microstructure Physics, Halle (Saale), Germany.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary
This summary is machine-generated.

We developed a heuristic optimization method to improve single-lobe emission in optical phased arrays (OPAs). This technique corrects for optical non-idealities, enhancing beam quality for alias-free out-of-plane emission applications.

Keywords:
crosstalkoptical phased arrayoptimizationprogrammable photonicssilicon photonics

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Area of Science:

  • Photonics
  • Integrated Optics
  • Optical Engineering

Background:

  • Achieving single-lobe emission in optical phased arrays (OPAs) is challenging due to densely spaced emitters and optical crosstalk.
  • Fabrication variations and inter-waveguide crosstalk degrade the performance of OPAs, limiting their practical applications.

Purpose of the Study:

  • To propose and validate a heuristic optimization method for amplitude and phase control in OPAs.
  • To mitigate optical non-idealities and achieve single-lobe emission with suppressed sidelobes.

Main Methods:

  • Heuristically optimized the amplitude and phase of each grating antenna in a silicon photonic integrated circuit.
  • Utilized 1 mm-long gratings with 775 nm spacing for operation in the 1450-1650 nm wavelength range.
  • Evaluated the two-dimensional (2D) beam-steering performance over a wide field-of-view (FOV).

Main Results:

  • Achieved a wide 2D beam-steering range of 110° × 28° within a 127° × 47° FOV.
  • Demonstrated an average sidelobe suppression of 8.2 dB, concentrating 34.5% of power into the main lobe.
  • Reached peak sidelobe suppression of 14.5 dB with 50% power in the main lobe.

Conclusions:

  • The heuristic optimization method effectively corrects optical non-idealities in OPAs.
  • The approach enables alias-free out-of-plane emission, suitable for advanced photonic applications.
  • This technique significantly improves the beam quality and power concentration in densely spaced emitter arrays.