All-optical pattern matching systems based on optical RTFT and conjugate multiplication for 260GBaud PSK optical signal.

The photonic firewall is a device that detects and localizes risky information at the optical layer to enhance the security of optical networks. The most significant and challenging component of the photonic firewall is the all-optical pattern matching system, which determines its overall performance. In response to the explosion of data volume, it is crucial to develop reconfigurable all-optical pattern matching systems capable of handling signals in arbitrary high-order modulation formats. All-optical pattern matching systems based on optical real-time Fourier transform(RTFT) and conjugate multiplication are proposed for phase-shift keying (PSK) optical signals. Numerical simulations demonstrate that the system is capable of matching 24-bit target sequences within 528-bit source sequences, which are signals in either QPSK or 8PSK modulation formats, at a transmission rate of 260 GBaud.