Heterodyne Random Bit Generation Using an Optically Injected Semiconductor Laser in Chaos

Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China.
Optics Letters (Impact Factor: 3.29). 06/2012; 37(11):2163-5. DOI: 10.1364/OL.37.002163
Source: PubMed


Random bit generation is experimentally demonstrated using a semiconductor laser driven into chaos by optical injection. The laser is not subject to any feedback so that the chaotic waveform possesses very little autocorrelation. Random bit generation is achieved at a sampling rate of 10 GHz even when only a fractional bandwidth of 1.5 GHz within a much broader chaotic bandwidth is digitized. By retaining only 3 least significant bits per sample, an output bit rate of 30 Gbps is attained. The approach requires no complicated postprocessing and has no stringent requirement on the electronics bandwidth.

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    • "The low-and high-frequency oscillations used for clock recovery have been intensively studied in the past ten years [5]–[10]. Recently, the chaotic feature of MISL has attracted significant attention due to their deterministic nature, broadband and noise-like spectral distribution, which are very attractive in high speed random bit generation [11], [12], chaos synchronization communication [13]–[17], and precision ranging of lidar systems [18]–[20]. Among various MISL, amplified feedback laser (AFL) is a typical and important example, which has been shown to be capable of working in dispersive Q-switching (DQS) pulsation mode, mode-beating (M-B) mode [21] and chaos [22], [23]. "
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    ABSTRACT: The dynamics of monolithically integrated amplified feedback lasers (AFL) is investigated through numerical simulation and experimental verification. The period-doubling route to chaos and high-frequency microwave generation are demonstrated through simulation. Then, we design and fabricate monolithically integrated AFLs. Mappings of dynamic states and oscillation frequency in the parameter space of phase section current $I_{rm P}$ and amplifier section current $I_{rm A}$ are depicted. For relative small $I_{rm A}$, the period doubling evolution to chaos is presented with the increase of $I_{rm P}$ . For the relative large $I_{rm A}$, a high-frequency mode-beating (M-B) pulsation can be observed under suitable value of $I_{rm P}$. The oscillation frequency of period-one is about 10 GHz and the frequency of M-B pulsation is over 40 GHz for the device with a total length of 780 μm.
    Journal of Lightwave Technology 10/2014; 32(20):3595-3601. DOI:10.1109/JLT.2014.2320371 · 2.97 Impact Factor
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    • "These nonlinear dynamics have many potential applications in random number generation [4], chaotic radar [5], secured communication [6], and photonic microwave generation [7]. In the past decades, most of researches have been devoted to understand the dynamics and applications of single-beam optical injection semiconductor laser system [1] [2] [3] [4] [5] [6]. Recently, the nonlinear dynamics in dual-beam optical injection semiconductor laser system has attracted much attention [7] [8] [9]. "
    Asia Communications and Photonics Conference; 01/2013
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    ABSTRACT: Random number generators are widely used in different applications. However, it is difficult to obtain a good random number generator in low precision and resource constrained system, such as an eight-bit micro-controller system which is still commonly used in industrial and consumer markets. This paper provides a practical solution for this problem based on chaotic systems. By the use of a modified Chua's circuit, it is demonstrated that the sampled state, after post-processing by a high-dimensional chaotic map, can be used as a random source even in an eight-bit environment. The randomness of the generated sequence is testified and confirmed by different statistical tests and the up-to-date statistical suite.
    International Journal of Bifurcation and Chaos 03/2008; 18(3). DOI:10.1142/S0218127408020719 · 1.08 Impact Factor
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