  This paper provides a summary of available technologies required for
implementing indoor laser-based wireless networks capable of achieving
aggregate data-rates of terabits per second as widely accepted as a sixth
generation (6G) key performance indicator. The main focus of this paper is on
the technologies supporting the near infrared region of the optical spectrum.
The main challenges in the design of the transmitter and receiver systems and
communication/networking schemes are identified and new insights are provided.
This paper also covers the previous and recent standards as well as industrial
applications for optical wireless communications (OWC) and LiFi.
