In this paper, we employ a simple theory based on driven damped oscillators to clarify the physical basis for message
extraction in optical chaos communications using injection-locked semiconductor lasers. The receiver laser is optically
driven by injection from the transmitter laser. We have numerically investigated the response characteristics of the
receiver when it is driven by periodic (message) and chaotic (carrier) signals. It is thereby revealed that the response of
the receiver laser in the two cases is quite different. For the periodic drive, the receiver exhibits a response depending on
the signal frequency, while the chaotic drive provides a frequency-independent synchronous response to the receiver
laser. CPF can be clearly understood in the difference between the periodic and chaotic drives. Message extraction using
CPF is also examined, and the validity of our theoretical explanation for the physical mechanism underlying CPF is thus
verified.
In this paper, we employ a simple theory based on driven damped oscillators to clarify the physical basis for message
extraction in optical chaos communications using injection-locked semiconductor lasers. The receiver laser is optically
driven by injection from the transmitter laser. We have numerically investigated the response characteristics of the
receiver when it is driven by periodic (message) and chaotic (carrier) signals. It is thereby revealed that the response of
the receiver laser in the two cases is quite different. For the periodic drive, the receiver exhibits a response depending on
the signal frequency, while the chaotic drive provides a frequency-independent synchronous response to the receiver
laser. CPF can be clearly understood in the difference between the periodic and chaotic drives. Message extraction using
CPF is also examined, and the validity of our theoretical explanation for the physical mechanism underlying CPF is thus
verified.
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