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Related Experiment Video

Updated: Aug 3, 2025

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Integrated contra-directionally coupled chirped Bragg grating waveguide with a linear group delay spectrum.

Xudong Gao1, Zhenzhu Xu2, Yupeng Zhu1

  • 1Anhui Province Engineering Laboratory for Antennas and Microwave, East China Research Institute of Electronic Engineering, Hefei, 230000, China.

Frontiers of Optoelectronics
|April 10, 2023
PubMed
Summary

Chirped Bragg grating waveguides offer advantages for beamforming but suffer from group delay errors. This study uses nonlinear gradient widths to linearize the group delay spectrum, significantly reducing errors.

Keywords:
Bragg gratingsSilicon photonicsTrue time delay

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Area of Science:

  • Photonics and Waveguide Optics
  • Optical Engineering
  • Signal Processing

Background:

  • Chirped Bragg gratings in waveguides show promise for wideband phased array beamforming due to low loss, wide bandwidth, and fast tuning.
  • A significant limitation is the large group delay error, primarily caused by a nonlinear group delay spectrum.
  • This nonlinearity hinders the practical application of these waveguide devices.

Purpose of the Study:

  • To address the challenge of large group delay errors in chirped Bragg grating waveguides.
  • To investigate a novel method for linearizing the group delay spectrum.
  • To improve the performance of chirped Bragg grating waveguides for beamforming applications.

Main Methods:

  • Implementing waveguides with nonlinear gradient widths.
  • Utilizing grating apodization to influence the mode effective index.
  • Experimental validation of the proposed compensation technique.

Main Results:

  • Achieved a linear group delay spectrum in experimental setups.
  • Successfully compensated for the nonlinear effects of grating apodization.
  • Reduced the group delay error by 50% compared to conventional designs.

Conclusions:

  • Waveguides with nonlinear gradient widths effectively linearize the group delay spectrum.
  • This method significantly reduces group delay errors in chirped Bragg grating waveguides.
  • The findings enhance the practical applicability of these waveguides in wideband phased array beamforming systems.