Spin-laser: towards the next generation of ultrafast optical transmitters
Short-range optical communication networks provide most of the communications bandwidth to secure the digital revolution. Key devices for high-speed optical interconnects are current-driven intensity modulated semiconductor lasers. But the modulation bandwidth of these devices is currently limited to values below 50 GHz and novel concepts for faster devices are desperately needed. Modulating the polarization of light in spin-lasers instead of the current and intensity in conventional devices is a highly promising concept to overcome the limitation and to develop optical transmitters with >200 GHz modulation bandwidth and ultralow power consumption . Here, we analyse the potential of this novel technology and discuss the challenges on the way to the next generation of ultrafast optical transmitters with Tbit/s data rates.
 M. Lindemann et al., Nature 568, 212 (2019).