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By frequency-band extracting, we experimentally and theoretically investigatetime-delay signature (TDS) suppression and entropy growth enhancement of achaotic optical-feedback semiconductor laser under different injection currentsand feedback strengths. The TDS and entropy growth are quantified by the peakvalue of autocorrelation function and the difference of permutation entropy atthe feedback delay time. At the optimal extracting bandwidth, the measured TDSis suppressed up to 96% compared to the original chaos, and the entropy growthis higher than the noise-dominated threshold indicating that the dynamicalprocess is noisy. The effects of extracting bandwidth and radio frequencies onthe TDS and entropy growth are also clarified experimentally and theoretically.The experimental results are in good agreements with the theoretical results.The skewness of the laser intensity distribution is effectively improved to0.001 with the optimal extracting bandwidth. This technique provides apromising tool to extract randomness and prepare desired entropy sources forchaotic secure communication and random number generation.

Chaotic Time-Delay Signature Suppression and Entropy Growth Enhancement Using Frequency-Band Extractor