High coupling efficiency grating couplers on lithium niobate on insulator

Abstract

We demonstrate monolithically defined grating couplers in $Z$-cut lithium niobate on insulator for efficient vertical coupling between an optical fiber and a single mode waveguide. The grating couplers exhibit $\sim 44.6\%$/coupler and $\sim 19.4\%$/coupler coupling efficiency for TE and TM polarized light respectively. Taperless grating couplers are investigated to realize a more compact design.

References in corpus (1)

• Monolithic Ultrahigh-Q Lithium Niobate Microring Resonator

Cited by in corpus (2)

• Wafer-scale low-loss lithium niobate photonic integrated circuits
• An Integrated Photonic Platform for Rare-Earth Ions in Thin Film Lithium Niobate