Vertical Injection and Wideband Grating Coupler Based on Asymmetric Grating Trenches
Optics
2021-10-28 v1 Applied Physics
Quantum Physics
Abstract
A Silicon-on-insulator (SOI) perfectly vertical fibre-to-chip grating coupler is proposed and designed based on engineered subwavelength structures. The high directionality of the coupler is achieved by implementing step gratings to realize asymmetric diffraction and by applying effective index variation with auxiliary ultra-subwavelength gratings. The proposed structure is numerically analysed by using two-dimensional Finite Difference Time Domain (2D FDTD) method and achieves 76% (-1.19 dB) coupling efficiency and 39 nm 1-dB bandwidth.
Keywords
Cite
@article{arxiv.2110.14085,
title = {Vertical Injection and Wideband Grating Coupler Based on Asymmetric Grating Trenches},
author = {Md Asaduzzaman and Robert J. Chapman and Brett C. Johnson and Alberto Peruzzo},
journal= {arXiv preprint arXiv:2110.14085},
year = {2021}
}
Comments
10 Pages, Article