Influence of optical feedback strength and semiconductor laser coherence on chaos communications

Bayati, Ban M. Al; Ahmad, Ahmad K.; Naimee, K. Al

doi:10.1364/josab.35.000918

Cited by 13 publications

(2 citation statements)

References 21 publications

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“…In the past few years, much effort has been made to study the nonlinear dynamic properties of semiconductor lasers subject to optical feedback [12,13] and optical injection [14][15][16][17][18][19]. Many theoretical and experimental schemes related to semiconductor lasers in unstable locking regions have been reported.…”

Section: Introductionmentioning

confidence: 99%

Transient nonlinear dynamics in an electrically modulated quantum cascade laser with optical injection

Wei

Liu

feng

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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Based on rate equations, we mainly simulate the transient instability characteristics of a 8 µm quantum cascade laser (QCL) subject to optical injection with AC electrical modulation. Simulation results have shown that the 1-periodic oscillation of optical injection-locked QCL is brokenby applying an AC current to the DC bias. Combining external optical injection and induced period current modulation can cause 1-period oscillation dropouts and display chaotic states outside the stable locking region, owing to the cooperative interplay between AC frequency and the periodic oscillation frequency caused by optical injection. To give a clear physical picture of the chaos under different linewidth enhancement factor, we use temporal series, Poincar´e bifurcation diagram, Fourier spectra, phase portraits and first return maps to analyze carefully. These analytical methods are effective for the dynamical behaviors of QCLs with low LEF, which shows that chaos of QCLs strongly rely on external modulation compared with class-B laser systems. This work paves a new way for realizing chaotic signal generation and have an important application in secure communication in mid-infrared and terahertz frequency band.

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Section: Introductionmentioning

confidence: 99%

Transient nonlinear dynamics in an electrically modulated quantum cascade laser with optical injection

Wei

Liu

feng

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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“…Decoding can be realised when the transmitter is copied or the parameters are known. In every communication, traditionally, parameters of chaotic emitter are fixed as secret keys [4][5][6][7]. Moreover, the sender and receiver must agree on parameters to obtain synchronisation decoding.…”

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confidence: 99%

CSO secret communication

Yan

2019

Electron. lett.

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A chaos shift parameter synchronisation (CSPS) system based on two different mutually coupled lasers synchronising with another laser is studied while a novel chaos shift orbit (CSO) encoding technique is presented for secret communication. CSPS between the emitter and receiver can still be obtained by shifting the emitter's parameter in real time, where the emitter operates its chaos to vary its orbit or jump across its orbit by using real-time current changes of one laser. Then, a CSO encoding scheme is implemented successfully. The emitter has numerous real-time shifting secret keys, so it is highly secure, and the signal is difficult to decipher.

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Chaos and Quasi-period in Erbium-Doped Fiber Laser

Yan

2019

Advances in Natural Computation, Fuzzy Systems and Knowledge Discovery

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Influence of optical feedback strength and semiconductor laser coherence on chaos communications

Cited by 13 publications

References 21 publications

Transient nonlinear dynamics in an electrically modulated quantum cascade laser with optical injection

Transient nonlinear dynamics in an electrically modulated quantum cascade laser with optical injection

CSO secret communication

Chaos and Quasi-period in Erbium-Doped Fiber Laser

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