Chaos Synchronization And Communications Of Bidirectionally Versus Unidirectionally Coupled Bandwidth-Enhanced Semiconductor Lasers

Both bidirectional and unidirectional synchronizations of feedback-induced chaos between bandwidth-enhanced semiconductor lasers by strongly injection-locked technique are analyzed and compared theoretically, and the related communication performances of both systems are also preliminarily examined. With extra external optical injection, the modulation bandwidth of chaos synchronization system can be greatly enhanced about three times under given parameters. The two systems both possess good robustness to parameters mismatching, where the bidirectional system shows higher quality synchronization than the unidirectional one within a broad range of mismatched parameters. Both systems can efficiently transmit high-speed signal.