A Joint Illumination and Communication GaN MQW LED Model for Visible Light Communication System

This paper presents a joint illumination and communication model for Gallium Nitride (GaN) Multiple Quantum Well (MQW) Light Emitting Diodes (LEDs) used in Visible Light Communication (VLC) systems. Based on device physics, the proposed model characterizes the intrinsic nonlinearity of the LED's electro-optic conversion by incorporating the LED's material, physical structure, and bias voltage. The modeling methodology and the model's accuracy are demonstrated through experimental measurements on a commercial sample LED by a VLC system performance testbed. The validation results indicate the proposed GaN MQW LED model is consistent with physical principles and accurately predicts the LED's nonlinear impact on the VLC system under varying signal frequency and illumination intensity of the LED, underscoring its significance for analyzing and optimizing VLC systems. Overall, the proposed model offers a valuable tool for the design and optimization of VLC systems using GaN-based LEDs.