Lifi Ai-Based Auto Alignment System For Laser Li-Fi Communication

Abstract

This paper presents a laser-based Li-Fi system for secure audio transmission using free space optical communication. Unlike conventional radio frequency systems, the proposed approach utilizes a 532 nm laser diode for transmitting modulated audio signals with high directionality and reduced interference. The system integrates analog-to-digital conversion, AES-based encryption, and optical modulation at the transmitter side. At the receiver, a photodiode detects the signal, followed by amplification, demodulation, and decryption to reconstruct the original audio. Experimental results demonstrate reliable transmission up to 20 meters with audio quality above 80% and latency below 15ms. The effects of ambient light and alignment error were also analyzed. The proposed system provides a low-cost, secure, and efficient alternative to RF communication systems.