Abstract
This paper reviews the recent advancement of microresonator frequency comb (i.e., microcombs) technologies
for applications related to the future beyond 5G (B5G) communication that is expected to be
launched in the 2030s. The advancement of microcomb technologies is the key to realizing low-noise
terahertz wave generation and low-latency wavelength division multiplexing (WDM) data transmission,
both of which are essential to support the B5G. We also report on the experimental demonstration of ultra-
dense WDM data transmission using an intensity modulation and direct detection (IM-DD) scheme.
We discuss that IM-DD communication is relevant to B5G thanks to its simplicity and low latency.
