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In order to enhance the confidentiality of AWG-based optical code division multiple access (OCDMA) scheme, the dynamic reconfigurable coding/decoding scheme based on chaos sequence is proposed to control optical switches and simple electrical shift registers. Since the chaos sequence is characterized with the property of pseudo random and maximum period time, the security mechanism of changing M-sequence codeword is implemented to avoid the tracking and attacking of unauthorized users (i.e., eavesdropper). Hence, The OCDMA system only needs to transmit the major parameter (e.g., initial condition and specified parameter) replacing the transmission of complex and mass encrypted key. In addition, the average changing step of proposed chaos/M-sequence mapping algorithm (i.e., 0.3

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