Integrated Discretely Tunable Optical Delay Line Based on Step-Chirped Subwavelength Grating Waveguide Bragg Gratings

被引：31

作者：

Sun, Hao ^{[1
]}

Wang, Yue ^{[1
]}

Chen, Lawrence R. ^{[1
]}

机构：

[1] McGill Univ, Dept Elect & Comp Engn, Montreal, PQ H3A 0E9, Canada

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2020年 / 38卷 / 19期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Silicon photonics; microwave photonics; delay lines and Bragg gratings; COUPLERS;

D O I：

10.1109/JLT.2020.3017496

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We demonstrate experimentally a discretely tunable optical delay line (ODL) using a step-chirped subwavelength grating (SWG) waveguide Bragg grating (BG) in silicon-on-insulator (SOI). The step-chirped structure is implemented using a serial array of 10 SWG waveguide BGs. It is designed using 3D finitedifference time-domain (FDTD) and the transfer matrix method (TMM), and is fabricated using electron beam lithography with a single etch. The grating structure has a total time delay of similar to 60 ps in steps of similar to 6.6 ps over an operating bandwidth of 41.7 nm; the measured results are in good agreement with simulations. We demonstrate the application of the ODL for antenna beamforming in simulations; in particular, we calculate the array factors for different phased array antennas using the measured time delays.

引用

下载

页码：5551 / 5560

页数：10

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