Researchers from ETH Zurich have achieved what scientists have been attempting to do for some 20 years: in their laboratory work as part of European Horizon 2020 research projects, they have manufactured a chip on which fast electronic signals can be converted directly into ultrafast light signals—with practically no loss of signal quality. This represents a significant breakthrough in terms of the efficiency of optical communication infrastructures that use light to transmit data, such as fiber optic networks.

In cities like Zurich, these fiber optic networks are already being used to deliver high-speed internet, digital telephony, TV, and network-based video or audio services (“streaming”). However, by the end of this decade, even these optical communication networks may reach their limits when it comes to rapid data transmission.

This is due to the growing demand for online services for streaming, storage and computation, as well as the advent of artificial intelligence and 5G networks. Today’s optical networks achieve data transmission rates in the region of gigabits (10⁹ bits) per second. The limit is around 100 gigabits per lane und wavelength. In the future, however, transmission rates will need to reach the terabit region (10¹² bits per second).