Affiliation:
1. Department of Electrical, Computer, and Energy Engineering, University of Colorado Boulder , 425 UCB, Boulder, Colorado 80309, USA
Abstract
A grating coupler on 700-nm-thick Z-cut lithium-niobate-on-insulator platform with high coupling efficiency, large bandwidth, and high fabrication tolerance is designed and optimized by inverse design method. The optimized grating coupler is fabricated with a single set of e-beam lithography and etching process, and it is experimentally characterized to possess peak coupling efficiency of −3.8 dB at 1574.93 nm, 1 dB bandwidth of 71.7 nm, and 3 dB bandwidth of over 120 nm, respectively.
Funder
Office of Multidisciplinary Activities
Office of Naval Research
National Science Foundation
Subject
Physics and Astronomy (miscellaneous)