White-Chaos Radar With Enhanced Range Resolution and Anti-Jamming Capability

Wang, Longsheng; Guo, Yuanyuan; Li, Pu; Zhao, Tong; Wang, Yuncai; Wang, Anbang

doi:10.1109/lpt.2017.2747141

Cited by 29 publications

(17 citation statements)

References 15 publications

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“…Owing to the considerable importance of optical chaos demonstrated in communication systems such as physical random bit generation [1-3], chaotic radars [4], secure-communications [5][6][7], optical time-domain reflectometer (OTDR) [8], optical neuron [9], Brillouin optical correlation-domain analysis (BOCDA) [10], optical chaos generation process has recently attracted very great research attention. Basically, the optical feedback into semiconductor laser used to produce chaotic signal was mainly limited in application performances due to the monopolization of chaos RF spectrum by the laser relaxation oscillation frequency [11] and time-delay signature (TDS) [12].…”

Section: Introductionmentioning

confidence: 99%

“…Basically, the optical feedback into semiconductor laser used to produce chaotic signal was mainly limited in application performances due to the monopolization of chaos RF spectrum by the laser relaxation oscillation frequency [11] and time-delay signature (TDS) [12]. The chaos spectrum monopolization by external cavity semiconductor laser (ECSL) relaxation oscillation frequency restricts the available chaos bandwidth and decides the random number generation rate [11], the speed of secure-communications [13] and the resolution of chaotic radar [14]. Easily measurable with the auto-correlation function (ACF), the delayed mutual information or the permutation entropy of the intensity time-series, the TDS is identifiable as local peak appearing around the feedback delay time and eventually its multiple.…”

Section: Introductionmentioning

confidence: 99%

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Wideband Millimeter-Wave Flat Chaos Generation With Controllable Power Spectrum Using Optical Time Lens

Zinsou

Gao

et al. 2021

IEEE Photonics J.

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We propose and numerically demonstrate the generation of wideband millimeter-wave (mmW) flat chaos with controllable power spectrum by injection of chaotic signal from external cavity semiconductor laser (ECSL) into optical time lens with noise phase modulation. Simulation results indicate consistent elimination of the ECSL relaxation oscillation frequency domination over the RF spectrum for large scale parameters of the optical time lens module and a wideband flat chaos, whose efficient bandwidth rapidly increases with the bandwidth of the noise signal driving the phase modulator and phase modulation index. Besides, we show that the time delay signature suppression can be concurrently achieved for moderate values of the noise bandwidth and phase modulation index. The proposed wideband mmW flat chaos exhibits great potential applications for ultrahigh-speed chaos communications, mmW radars and macroscopic mmW noise source required for mmW research and design.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wideband Millimeter-Wave Flat Chaos Generation With Controllable Power Spectrum Using Optical Time Lens

Zinsou

Gao

et al. 2021

IEEE Photonics J.

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“…features into the dynamics which threaten the security of chaos communication [8], limit the key space [9], weaken anti-jamming capabilities [10] and reduce the randomness of bit sequences [11].…”

Section: Introductionmentioning

confidence: 99%

Suppression of Cavity Time-Delay Signature Using Noise-Phase-Modulated Feedback

et al. 2020

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We propose reconfiguration of the conventional feedback scheme to suppress the external-cavity time-delay signature (TDS) by adding noise phase modulation in the feedback of semiconductor laser. Noise-phase-modulated feedback introduces broad band noise frequencies into the feedback light and enables the suppression of the TDS. In this work, by means of simulations, the effect on TDS suppression of phase modulation (PM) index is explored. In addition, the influence of noise bandwidth variation is investigated. Using the auto-correlation function to quantity the TDS, we find that, for a large range of operating parameters, the TDS is significantly suppressed to the noise level and even submerged into the base noise. It is shown that suppression TDS is achievable over a wide operating parameter provided the noise generator bandwidth is of order 10 GHz and the PM index is greater than about 3. The proposed configuration will have widespread applications in contexts where suppression of the TDS is required. INDEX TERMS Chaos, noise phase modulation, time-delay signature.

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“…There exist other configurations such as very-short caviry feedback [6], filtered optical feedback [7] and phase-conjugated optical feedback [8], [9]. Thanks to their high-complex dynamical behaviour, chaotic lasers have been used for number of applications such as chaos secure communications [10], [11], [12], chaotic lidar, chaotic radar [13], chaotic optical timedomain reflectometry [14], random number generation [15], reservoir computing [16], [17] and rogue wave generation [18], [19].…”

Section: Introductionmentioning

confidence: 99%