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The manuscript “Electro-optic chaos system with time delay signature concealment based on XOR operation and multi-bit PRBS” by Zou et al. is well organized. The authors propose a novel chaos system with XOR operation and multi-bit PRBS. In this scheme, they prove that the introduction of DSP can enlarge the key space and TDSs can be concealed with the appropriate DSP parameter. The research results are interesting and helpful for further study of the electro-optic chaos theory. However, some issuers should be clarified before it is published in OE.
This MS proposed a PRBS based time delay concealment scheme for OEO chaotic system. The analog state variable is converted to digital sequence through an ADC and a series of XOR operation is conducted in DSP. The authors claimed that the complexity is higher than conventional OEO and the time delay can be concealed. The simulation is conducted in detail, and the effectiveness is verified. However, I have some concerns about the scheme.