Phase-locking-free all-optical binary sequence flexible matching system

The photonic firewall that can directly detect intrusion in the optical layer is an important network security tool for optical networks. The all-optical matching system is the core part of the photonic firewall, which can recognize the designated target sequence, such as an IP address and port number in the input data sequence. In optical networks, the diversity of modulation formats and the uncertainty of attack sources require the flexibility of matching systems. Flexible matching means the matching system can identify various signal fields with multiple modulation formats, avoiding to place separate matching systems to handle signals with different modulation formats separately and reduces the system complexity. And the recognition of various fields makes the matching system can promote the attack masking from a single user to the subnet according to the field of the subnet mask before determining the attacking IP address. Moreover, the all-optical matching system should be phase-locking free to avoid photoelectric conversion. In this paper, we designed the phase-locking-free all-optical flexible matching system to recognize the different sequence fields in OOK, BPSK, and Polsk signals. The proposed system is verified through VPI Transmission Maker 8.5. Simulation results show that the proposed system can achieve sequence recognition in optical OOK, BPSK, and Polsk signals at the data rate of 80 Gbps.