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

doi:10.1007/s12200-023-00061-8

Front. Optoelectron.

2023, Vol. 16

Issue (1) : 6 https://doi.org/10.1007/s12200-023-00061-8

RESEARCH ARTICLE

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

Xudong Gao¹, Zhenzhu Xu¹(

), Yupeng Zhu¹, Chengkun Yang¹, Shoubao Han¹, Zongming Duan¹, Fan Zhang², Jianji Dong²

¹. Anhui Province Engineering Laboratory for Antennas and Microwave, East China Research Institute of Electronic Engineering, Hefei 230000, China
². Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

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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.

Keywords Bragg gratings Silicon photonics True time delay

Corresponding Author(s): Zhenzhu Xu

Issue Date: 20 April 2023

Cite this article:

Xudong Gao,Zhenzhu Xu,Yupeng Zhu, et al. Integrated contra-directionally coupled chirped Bragg grating waveguide with a linear group delay spectrum[J]. Front. Optoelectron., 2023, 16(1): 6.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-023-00061-8
https://academic.hep.com.cn/foe/EN/Y2023/V16/I1/6

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