Design of high-speed all-optical data security system based on XGM in SOA for optical networks

With the ever-growing demand for ultra-fast data transmission, ensuring the security of data transmission in optical networks has become paramount. Therefore, this manuscript proposes an all-optical data security system at a bit rate of 250 Gbps. The proposed system is an all-optical encryption-decryption system. An orthogonally polarized secure key (OPSK) is used to encrypt the signal at the transmitter, and the same key is used at the receiver to decrypt the encrypted signal. This system leverages OPSK, inducing cross-gain modulation in semiconductor optical amplifiers to cipher the input signal at the transmitter and decipher the encrypted signal at the receiver for the optical network. A high-quality (Q) factor of 39.91 dB and a good extinction ratio (ER) of 10.14 dB are obtained for the encrypted signal. Similarly, for the decrypted signal, good Q factor and ER of 22.59 dB and 11.42 dB, respectively, are obtained at a typical distance of 76.7 km for the operating speed of 250 Gbps, thereby validating its performance in ultra-high-speed optical networks.