Abstract
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.
Highlights
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]–[7], optical time-domain reflectometer (OTDR) [8], optical neuron [9], Brillouin optical correlationdomain analysis (BOCDA) [10], optical chaos generation process has recently attracted very great research attention
We propose and numerically demonstrate the generation of wideband millimeterwave 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
To get insight into the effects of the injection of chaotic signal from ECSL into optical time lens module such that the PM is driven by amplified spontaneous emission (ASE) noise signal, we firstly performed the numerical simulations to obtain the chaotic signal corresponding to the conventional optical feedback
Summary
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]–[7], optical time-domain reflectometer (OTDR) [8], optical neuron [9], Brillouin optical correlationdomain analysis (BOCDA) [10], optical chaos generation process has recently attracted very great research attention. 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 It readily reveals the external cavity parameters and constitutes a default for the randomness of the generated bits, and affects the security level of chaos-based secure-communication systems [15]–[17]. Numerical results indicate consistent elimination of the ECSL relaxation oscillation frequency domination over the RF spectrum for large scale values of the coefficients of dispersive media constituent of the optical time lens, and a wideband mmW flat chaos whose efficient bandwidth rapidly increases with the ASE noise bandwidth and phase modulation index increase. The evaluation of the ACF shows the TDS suppression for moderate values of the ASE noise bandwidth and phase modulation index
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