An InAs/InP quantum-dash mode-locked laser (QD-MLL) with phase-locked comb lines is an excellent optical source and a microwave source for, respectively, optical and wireless transmission. In this talk, a duplex radio over fiber (RoF) link using a QD-MLL for RoF transmission is reported. A few implementation issues including phase noise

5G and 6G mobile communication systems will encompass a Non-Terrestrial Network (NTN) that will include different satellite systems (LEO including cubesats/MEO/GEO) as well as High-Altitude Platform Stations (HAPS) in the stratosphere and Unmanned Aerial Vehicles (UAV) to cover remote areas that otherwise could not have access to the Internet. IoT