Abstract

Based on the theoretical model of the synchronization system with incoherent optical feedback, message encoding and decoding of the chaotic system have been investigated. The results show that message can be hidden efficiently in the chaotic signal during the transmission with three encryption schemes (i.e., chaos shift keying (CSK), chaos masking (CMS) and additive chaos modulation (ACM)); the message of 250Mb/s can be decoded in the receiver with CSK and CMS; when the bit rate increases to 2.5Gb/s, the message can not be decoded with CSK and the quality of message decoded with CMS becomes bad; and when the bit rate increases to 12.5Gb/s, the message can not be decoded with CSK and CMS, however the message can be decoded perfectly by adopting ACM.

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