High-speed InGaN/GaN blue laser diodes for visible light communications

Laser-based visible laser communication (VLC) is an emerging optical wireless communication technology for future 6G wireless network. In this work, we present the design, fabrication, and characterization of high-speed InGaN/GaN multiple quantum-well (MQW) laser diodes on c-plane GaN substrate. The peak emission wavelength is ~ 451 nm. A modulation bandwidth of 5 GHz has been achieved. Using the laser diode as transmitter, a data transmission rate beyond 15 Gbps has been measured in the VLC link using discrete multitone (DMT) modulation.