Silicon photonics is a technology that integrates optical components on silicon substrates for transmitting and processing data using optical signals.
Its strengths lie in high-speed communication and low power consumption, while enabling high integration density through combination with existing electronic circuits.
Silicon photonics
Silicon photonics is the study and application of photonic systems which use silicon as an optical medium. The silicon is usually patterned with sub-micrometre precision, into microphotonic components. These operate in the infrared, most commonly at the 1.55 micrometre wavelength used by most fiber optic telecommunication systems. The silicon typically lies on top of a layer of silica in what is known as silicon on insulator (SOI).
https://en.wikipedia.org/wiki/Silicon_photonics

Seonglae Cho