Chaotic data encryption using semiconductor lasers

摘要

Synchronized external-cavity diode lasers are used for chaotic optical communication. A 1 GHz message is encoded by current modulation of the chaotic transmitter laser and decoded by a synchronized chaotic receiver laser diode. The effect of introducing the message by optical injection into the receiver laser instead of direct current modulation is then investigated. Finally we show how the signal masking can be enhanced by the appropriate choice of external cavity length for a given message frequency.