# Grating coupler
Grating couplers are important optical devices used for coupling light between an optical fiber and a planar waveguide or other photonic structures. They consist of a periodic structure of ridges or grooves etched into a thin film on a substrate, which diffracts light at a specific angle and wavelength. Grating couplers offer advantages over other coupling techniques, such as low loss, high efficiency, and the ability to integrate with other photonic components on a chip. They are widely used in applications such as optical communications, sensing, and biomedical imaging. The design and optimization of grating couplers are important areas of research in the field of integrated photonics. In this example, we model a 3D grating coupler in a Silicon on Insulator (SOI) platform.
To view the full example in Python, please click here (opens new window).