Design of a wireless laser communication system based on PPM technique

Wireless laser communication has many advantages over traditional radio communication especially in high data rate. A high-speed wireless laser communication system employing optical pulse position modulation (PPM) is developed. The principle of PPM modulation method is analyzed, and the corresponding frame format is presented. Then the detailed design of PPM modulator and demodulator are separately described, and the practical transmitting and receiving systems are realized. The whole communication system is compact, efficient, reliable and inexpensive. It has achieved a high-speed rate communication up to megabits per second and a reasonably low error rates.