Time delay signature concealment of optical feedback induced chaos in an external cavity semiconductor laser

Wu, Jiagui; Xia, Guang-Qiong; Tang, Xi; Lin, Xiaohui; Deng, Tao; Fan, Li; Wu, Zheng-Mao

doi:10.1364/oe.18.006661

Cited by 66 publications

(29 citation statements)

References 12 publications

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“…For 0.0013 < γ < 0.019 (region II), the amplitude a p of time-delay signature attenuates significantly with the decrease of the feedback strength, and the weakest time-delay signature is obtained at γ ≈ 0.003. Meantime, the identified Wu et al (2010);© 2010 OSA] delay begins to deviate from the expected time of Δt p ≈ 2 ns. For γ < 0.0013 (region III), the amplitude of time-delay signature again increases.…”

Section: Signatures In Optical Feedback Induced Chaosmentioning

confidence: 94%

“…A chaotic signal inevitably contains the time signatures of the optical feedback loop and the relaxation oscillation of the semiconductor laser, which can be easily inferred from the analysis of the time correlation for the signal. Otherwise, the knowledge of the time delay allows for the projection of the high-dimensional attractor onto a reduced-dimensional phase space, which makes the system vulnerable to low-computational-complexity identification techniques (Rontani et al 2007(Rontani et al , 2009Wu et al 2010). Therefore, it is essential to hide the signatures of these time constants in the waveform of chaotic carrier, since these time constants are important keys in chaos-based secure communications.…”

Section: Signatures In Optical Feedback Induced Chaosmentioning

confidence: 99%

“…Using these measures, time signatures in chaotic waveforms in semiconductor lasers with optical feedback are examined in the following. Figure 14.1 shows some experimental results for chaotic time series and their time-delay signatures (the autocorrelation function and the mutual information) for the variations of the optical intensity feedback strength (Wu et al 2010). The laser used is a single mode DFB laser operating with a wavelength at 1.55 µm.…”

Section: Signatures In Optical Feedback Induced Chaosmentioning

confidence: 99%

See 2 more Smart Citations

Physical Random Number Generations and Photonic Integrated Circuits for Chaotic Generators

Ohtsubo

2012

Springer Series in Optical Sciences

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The strong demands for increased security in data exchange and communications in optical networks have directed a considerable part of research to physical layer data encryption techniques and, for such purpose, higher bit rates of random number generations have been expected. One of the methods based on the dynamics in semiconductor lasers is the use of chaotic times series to generate ultrafast random bit streams as a physical layer. Optical techniques are not only suitable for high-speed random number generations but also for having the good conformity for data transmission in existing optical channels. In this chapter, the principle and practice of physical random number generations based on chaotic dynamics in semiconductor lasers are discussed. The subjects related to the generations of high quality random bit sequences are also presented. For the implementation of the techniques in real systems, the miniaturization and integration of light sources as chaotic generators are essential to perform stable generations of random number bit sequences. Such systems are also expected as light sources in chaotic secure communications discussed in the preceding chapter. For this aim, deigns, and applications of all optical photonic integrated circuits for chaotic generators are presented. Finally, an application of the systems to random key distributions in quantum cryptographic systems is demonstrated.

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Section: Signatures In Optical Feedback Induced Chaosmentioning

confidence: 94%

Section: Signatures In Optical Feedback Induced Chaosmentioning

confidence: 99%

Section: Signatures In Optical Feedback Induced Chaosmentioning

confidence: 99%

See 1 more Smart Citation

Physical Random Number Generations and Photonic Integrated Circuits for Chaotic Generators

Ohtsubo

2012

Springer Series in Optical Sciences

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“…Rontani et al proposed that TD signature identification would be impossible when the TD is close to the relaxation period of the laser operating with weak feedback [12] . Their theory was demonstrated experimentally in 2010 [13] . In contrast, several techniques for extracting the TD signature also exist; however, usually, their observables are the recorded chaotic time series.…”

mentioning

confidence: 95%

Method to identify time delay of chaotic semiconductor laser with optical feedback

Guo¹,

Yuan²,

Wang³

2012

中国光学快报

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We propose a power spectrum analysis method to directly identify the time delay of a chaotic semiconductor laser with optical feedback. By measuring the radio frequency (RF) power spectrum of the chaotic laser and performing an inverse Fourier transform, we can easily unveil all the time delay signatures, regardless of whether the chaotic output is induced by single or multiple feedback. This method successfully retrieves the two time delay signatures from the power spectrum of a semiconductor laser with double-cavity feedback.OCIS codes: 190.3100, 140.5960. doi: 10.3788/COL201210.061901. Optical chaos has attracted considerable attention in recent years due to its great applications in various fields, such as chaos-based communication encryption systems [1] , chaotic lidars [2] , fast random bit sequences generators (RNGs) [3] , and chaotic optical time-domain reflectometry [4] . Through perturbing a semiconductor laser (SL) with optical injection, optical feedback, or optoelectronic feedback, the laser can be driven into broadband chaotic output [5] . Among the mentioned methods, the semiconductor laser with optical feedback (SL-OFB) may be the most common applied chaotic sources due to its unique virtues, such as simple configuration, small size, feasible controllability, and rich chaotic dynamics.Nevertheless, the output of SL-OFB usually has periodic intensity fluctuations. These fluctuations are nearly identically repeated at the photon round-trip time in the external cavity, and are widely called the time delay (TD) signature. The TD signature seriously affects the performance of chaotic system in some applications. For example, the TD signature provides the clue to break the chaos-based secure communication and can deteriorate the randomness of RNGs based on SL-OFB. Some scenarios have been proposed to conceal the TD signature of SL-OFB. Typical scenarios are to generate high-dimensional chaos [6] , to modulate the delay time [7,8] , and to use multiple feedback [9,10] . Recently, Wu et al. experimentally showed that the TD signatures can be suppressed in two limits when double external cavities are used; one is that the two external cavities have roughly equal lengths, and the other is that one cavity length is approximately half of the other [11] . Rontani et al. proposed that TD signature identification would be impossible when the TD is close to the relaxation period of the laser operating with weak feedback [12] . Their theory was demonstrated experimentally in 2010 [13] . In contrast, several techniques for extracting the TD signature also exist; however, usually, their observables are the recorded chaotic time series. Two widely applied techniques are the autocorrelation function (ACF) and the delay mutual information (DMI) [14] . Other techniques include the phase information [15] , the minimal forecast error [16] , the filling factor analysis [17] , the permutation-information theory [18] , and the extrema interval analysis [19] . In 2010, we found that the TD signature could be identified t...

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“…As for acquiring fast random number, the TDS of chaos may cause that the randomness and statistical performance of random bits are deteriorated [5]. As a result, how to analyze and suppress the TDS of chaos in a SL-based chaotic system has been a subject of considerable research effort in recent years [17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Time delay signature concealment of optical feedback induced chaos in an external cavity semiconductor laser

Cited by 66 publications

References 12 publications

Physical Random Number Generations and Photonic Integrated Circuits for Chaotic Generators

Physical Random Number Generations and Photonic Integrated Circuits for Chaotic Generators

Method to identify time delay of chaotic semiconductor laser with optical feedback

Time-delay signatures hidden in the phase of chaotic output of mutually delay-coupled vertical-cavity surface-emitting lasers

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