High-Speed GaN-Based 405 Nm Violet Superluminescent Diode with Tilted Facet for Visible Light Communications

Visible light communication (VLC) based on superluminescent diode (SLD) is a promising technology with great potential for future 6G optical wireless network. In this work, a 405 nm violet SLD device is fabricated with an 8 degrees tilted facet at one end of the waveguide based on InGaN/GaN quantum wells. The device has an optical power of 14.67 mW under continuous-wave operation. The full width at half maximum (FWHM) of the SLD at 400 mA is 12.52 nm, which is significantly larger than that in a violet laser diode (LD). Using the SLD as transmitter in VLC system, a high data transmission rate of 3.299 Gbps has been achieved using the discrete multiple tone (DMT) modulation. The corresponding bit error ratio (BER) is measured to be 1.67 x 10-3, which satisfies the forward error correction (FEC) threshold of 3.8 x 10-3. The results suggest that such device can be used as a promising light source for VLC and light fidelity (LiFi) applications. Visible light communication (VLC) based on superluminescent diode (SLD) is a promising technology with great potential for future 6G optical wireless network. This work demonstrates 405 nm violet-emitting SLDs with tilted facet design grown on c-plane GaN substrate. A high data transmission rate of 3.299 Gbps has been achieved using the discrete multiple tone (DMT) modulation.image (c) 2024 WILEY-VCH GmbH