Patent ID: 6744794
Filing Date: 2004-06-01
Classification: H01S

Abstract:
A system for handling laser-communication multiplexing in chaotic secure communications, comprisinga transmitter containing a self-pulsating laser diode, wherein the self-pulsating laser diode is driven by an externally applied ac current containing messages to be multiplexed; a receiver containing a self-pulsating laser diode, wherein the self-pulsating laser diode of the receiver is driven by signals output by the transmitter, wherein said receiver includes: a synchronization device for simplex-coupling the signals output by the transmitter to response signals of the receiver by adjusting an amplitude of the self-pulsating laser diode according to a predetermined coupling coefficient shared by the transmitter and receiver and comparing output signals from the self-pulsating laser diode of the receiver with the signals output by the transmitter to obtain a difference signal including synchronized chaotic time sequences; and a low-pass filter, to which the difference signal is applied, said low-pass filter transforming chaotic time sequences of lower fractal dimension into chaotic time sequences of higher fractal dimension to cause a periodicity of the multiplexed messages to emerge by adjusting an appropriate parameter of the low-pass filter, thereby decoding the multiplexed message encoded by the chaotic laser light of the transmitter end.