Effect of system gain on optical chaotic communications systems

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Abstract
The chaotic communications systems with optical feedback lasers in strong injection and open-loop configuration are studied in this paper. The quantity relationship between gain and injection factor is obtained by numerical calculation. The demodulators performances under the conditions of whether the gain is used to adjust the output of the receiver are compared. The result indicates that the recovered message is more close to the original message by using the adjusted subtraction demodulation method. It is proved that message rate has no effect on gain by testing sine signals with different rates. Further，the gain is shown to be independent of message type and encryption mechanism by testing digital signals at 0.2?Gbit/s rate.

Keywords:
optical chaotic communication /

strong Injection /

system gain /

synchronization
Authors and contacts
Liu Hui-Jie²,

Feng Jiu-Chao¹

(1)华南理工大学电子与信息学院，广州 510641; (2)华南理工大学电子与信息学院，广州 510641；东莞理工学院电子工程系，东莞 523808
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