具有线性群延迟谱的集成反向耦合啁啾布拉格光栅波导

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

作者信息

Gao Xudong, Xu Zhenzhu, Zhu Yupeng, Yang Chengkun, Han Shoubao, Duan Zongming, Zhang Fan, Dong Jianji

机构信息

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

Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.

出版信息

Front Optoelectron. 2023 Apr 10;16(1):6. doi: 10.1007/s12200-023-00061-8.

DOI:10.1007/s12200-023-00061-8

PMID:37036614

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10086080/

Abstract

Due to the advantages of low propagation loss, wide operation bandwidth, continuous delay tuning, fast tuning speed, and compact footprints, chirped Bragg grating waveguide has great application potential in wideband phased array beamforming systems. However, the disadvantage of large group delay error hinders their practical applications. The nonlinear group delay spectrum is one of the main factors causing large group delay errors. To solve this problem, waveguides with nonlinear gradient widths are adopted in this study to compensate for the nonlinear effect of the grating apodization on the mode effective index. As a result, a linear group delay spectrum is obtained in the experiment, and the group delay error is halved.

摘要

由于啁啾布拉格光栅波导具有低传输损耗、宽工作带宽、连续延迟调谐、快速调谐速度和紧凑尺寸等优点，在宽带相控阵波束形成系统中具有很大的应用潜力。然而，大群延迟误差的缺点阻碍了它们的实际应用。非线性群延迟谱是导致大群延迟误差的主要因素之一。为了解决这个问题，本研究采用具有非线性梯度宽度的波导来补偿光栅切趾对模式有效折射率的非线性影响。结果，在实验中获得了线性群延迟谱，群延迟误差减半。