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Selected topics in electornics and systems

All-Optical Encryption and Decryption Using Quantum Dot Semiconductor Optical Amplifiers with Two Photon Absorption

Sunil Thapa, Shunyao Fan, Xiang Zhang, NILOY KUMAR DUTTA

Published Dec 17, 2025• 0 citations
Publisher
DOI
10.1142/9789819824236_0005

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In this work, we investigate the two-photon absorption (TPA)-based quantum-dot semiconductor optical amplifier (QD-SOA) to simulate the encryption and decryption. Optical logic gates and pseudo-random binary sequence (PRBS) generators are realized using the TPA-based QD-SOA, and the encryption algorithm and key are based on these optical logic gates. The fast phase change due to the incorporation of TPA allows generation of keystream at high speed. Simulation results are carried out to show that encryption and decryption using PRBS based on optical logic gate are achievable.
A scheme to realize high speed all-optical encryption and decryption using key-stream generators and an XOR gate based on quantum dot semiconductor optical amplifiers (QD-SOAs) was studied. The key used for encryption and decryption is a high speed all-optical pseudorandom bit sequence (PRBS) which is generated by a linear feedback shift register (LFSR) composed of QD-SOA-based logic XOR and AND gates. Two other kinds of more secure key-stream generators, i.e. cascaded design and parallel design, were also designed and investigated. Nonlinear dynamics including carrier heating and spectral hole-burning in the QD-SOA are taken into account together with the rate equations in order to realize all-optical logic operations. Results show that this scheme can realize all-optical encryption and decryption by using key-stream generators at high speed (~250 Gb/s).