Open-loop chaotic synchronization of injection-locked semiconductor laserswith gigahertz range modulation

Unidirectional chaotic synchronization between two remote injection-locked semiconductor lasers to achieve chaotic communications is investigated nume rically. Different from the direct chaotic masking methods, the chaotic car rier wave is generated from different chaotic states in transience instead of a fixed chaotic state in static to prevent it from being reproduced thro ugh a reconstructed embedding phase space. The testing digital and sinusoid al message signals in the gigahertz range can be easily recovered without t he use of any electronic or optical filter to filter out the synchronizatio n error. The robustness of synchronization is examined by using the intrins ic white noise of the transmitter and the receiver as the perturbation. The effects of parameter mismatches on the quality and robustness of synchroni zation are analyzed in detail. The results show that different internal par ameters have very different tolerances for parameter mismatch. A short disc ussion on the phase sensitivity of synchronization is also given.