Abstract: A laser communication system based on pulse dialing modulation is designed to improve the time jitter performance in free space optical communication. Different from the OOK( On-Off Keying) and PPM( Pulse Position Modulation) methods, this system only needs to distinguish whether there is a pulse or not, which can avoid the influence of time jitter. The system implements the pulse dialing modulation at the transmitter, the signal decision and error control at the receiver through STM32 MCU(Microcontroller Unit) programming. The receiver of this system adopts a method of multi-channel reception. It enlarges the receiving area to reduce the aiming error. The experiment results show that this system is quick-response, reliable and easy to realize, and its communication distance can reach 10 meters.

Key words: pulse dialing modulation, anti-jitter, laser communication system, multi-channel reception