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In this paper, we proposed an optical encryption /decryption system based on all-optical shift register. The key used for encryption and decryption is an all-optical pseudorandom bit sequence (PRBS). By analysing the performance of the core functional unit of this system, which is composed of SOA-based logic XOR and all-optical clocked D flip-flops, we demonstrated the system's capability of producing...
In this paper, we have proposed an optical pulse position modulation based on double-circle iteration, targeting at the next generation of high speed optical metropolitan area networks. The focuse of this paper lies on the performance of spectral efficiency, the bit error rate and chromatic dispersion. The proposed modulation format is also compared to on-off-keying(OOK) and 4-level pulse-amplitude...
In this paper, a new all optical flip-flop structure based on semiconductor optical amplifier (SOA) and Mach-Zehnder interferometer (MZI) is presented and demonstrated. Through carrying out a detailed analysis of SOA's NPR effect and the coupled SOA-MZI structure, we build up a theoretical SOA model with polarization dependent rate-equations and MZI model employing SOA cross-phase modulation in the...
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