Time-delay signature cancellation and bandwidth enhancement based on phase-modulation injection using chaotic signals

We experimentally reveal the potential security risks for chaotic semiconductor lasers caused by time-delay signature (TDS). In order to eliminate TDS and enhance effective bandwidth, we propose a new scheme by introducing phase-modulation injection using Gaussian noise or pseudo-random binary seque...

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Bibliographic Details
Published in:Applied optics (2004) 2021-06, Vol.60 (17), p.5245
Main Authors: Liu, PengBo, Zhang, ShengHai, Zhang, XiaoXu, Wu, TianAn
Format: Article
Language:English
Subjects:
Bandwidths
Chaos theory
Modulation
Pseudorandom binary sequences
Random noise
Semiconductor lasers
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Summary:We experimentally reveal the potential security risks for chaotic semiconductor lasers caused by time-delay signature (TDS). In order to eliminate TDS and enhance effective bandwidth, we propose a new scheme by introducing phase-modulation injection using Gaussian noise or pseudo-random binary sequence (PRBS) as phase-modulation signals. Our numerical results indicate that TDS elimination and bandwidth enhancement are obtained over a wide-parameter region of injection strength and frequency detuning. We further improve the scheme by using two channels of chaotic lasers to generate phase-modulation signals. Numerical simulation results show that the improved scheme is feasible, and TDS cancellation quality is always excellent in wide phase-modulation depth ranges.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.423716