Enhancing the Bandwidth of the Optical Chaotic Signal Generated by a Semiconductor Laser With Optical Feedback

Wang, Anbang; Wang, Yuncai; He, Hucheng

doi:10.1109/lpt.2008.2002739

Cited by 178 publications

(85 citation statements)

References 13 publications

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“…Additionally, the resonance of the external feedback cavity excites many external-cavity modes (ECMs) in the laser field and leads to a periodically modulated spectrum similar to that of a frequency comb with a spacing equal to the reciprocal of the feedback delay [9,10]. Considerable effort has recently been devoted to expand the power spectrum [8,11] or to depress the external-cavity resonances [12], but it is difficult to completely eliminate the effects of the intrinsic oscillations [3,13]. These intrinsic oscillations impose restrictions on random number generation from physical chaos [10] and raise arguments that the extracted numbers are not truly random [14].…”

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confidence: 99%

“…As a result, the intrinsic oscillations, including the characteristic response frequency of the nonlinear device and the resonance of the feedback loop, introduce deterministic features and periodicity into the chaos and thus limit the randomness. Taking the paradigm of a delay system, i.e., an ECL, as an example, the relaxation oscillation of the semiconductor laser dominates the laser intensity chaos and leads to a strong peak projecting from the power spectrum [8]. Additionally, the resonance of the external feedback cavity excites many external-cavity modes (ECMs) in the laser field and leads to a periodically modulated spectrum similar to that of a frequency comb with a spacing equal to the reciprocal of the feedback delay [9,10].…”

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confidence: 99%

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Optical Heterodyne Generation of High-Dimensional and Broadband White Chaos

Wang¹,

Wang²,

Li³

et al. 2015

IEEE J. Select. Topics Quantum Electron.

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Physical chaos is a fascinating prospect for high-speed data security by serving as a masking carrier or a key source, but suffers from a colored spectrum that divulges system's intrinsic oscillations and degrades randomness. Here, we demonstrate that physical chaos with a white spectrum can be achieved by the optical heterodyning of two delayed-feedback lasers. A white chaotic spectrum with 1-dB fluctuation in a band of 11 GHz is experimentally obtained. The white chaos also has a perfect delta-like autocorrelation function and a high dimensionality of greater than 10, which makes chaos reconstruction extremely difficult and thus improves security. PACS numbers: 42.65. Sf, 05.45.Jn Macroscopic chaos in fast nonlinear optoelectronic or laser systems has motivated remarkable developments in information security. For instance, macroscopic chaos serving directly as a masking carrier improves the rate of secure communications to gigabits per second [1]. Additionally, fast chaos replaces microscopic noise as an entropy source to greatly increase the speed of generating physical random keys [2,3] and as a radar signal to enhance anti-jamming capability and spatial resolution [4,5]. One of the most important factors is that the physical chaos has a spread spectrum and an irregular waveform with larger amplitude than that of microscopic noise, and the use of chaos can avoid the wideband amplification required in a noise generator.Essentially, the randomness and security of chaos is vital to chaos-based information security. However, the randomness of physical chaos is usually degraded by intrinsic oscillations of nonlinear chaos systems. Currently, fast physical chaos generators typically consist of a nonlinear optical or optoelectronic device subject to a feedback loop that partially couples the output back into the device, such as an external-cavity semiconductor laser (ECL) [6] and an optoelectronic oscillator [7]. As a result, the intrinsic oscillations, including the characteristic response frequency of the nonlinear device and the resonance of the feedback loop, introduce deterministic features and periodicity into the chaos and thus limit the randomness. Taking the paradigm of a delay system, i.e., an ECL, as an example, the relaxation oscillation of the semiconductor laser dominates the laser intensity chaos and leads to a strong peak projecting from the power spectrum [8]. Additionally, the resonance of the external feedback cavity excites many external-cavity modes (ECMs) in the laser field and leads to a periodically modulated spectrum similar to that of a frequency comb with a spacing equal to the reciprocal of the feedback delay [9,10]. Considerable effort has recently been devoted to expand the power spectrum [8,11] or to depress the external-cavity resonances [12], but it is difficult to completely eliminate the effects of the intrinsic oscillations [3,13]. These intrinsic oscillations impose restrictions on random number generation from physical chaos [10] and raise arguments that the extracted number...

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confidence: 99%

mentioning

confidence: 99%

Optical Heterodyne Generation of High-Dimensional and Broadband White Chaos

Wang¹,

Wang²,

Li³

et al. 2015

IEEE J. Select. Topics Quantum Electron.

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“…The bandwidth of semiconductor laser will be verified and enhanced by optical injection. The bandwidth of such chaotic laser transmitter is enhanced roughly three times by optical injection compared with the bandwidth when there is no optical injection [14]. Chaotic dynamics and period doubling were observed experimentally in the VCSELs lately [15], in addition to edge emitting lasers.…”

Section: Chaos By Injection Lockingmentioning

confidence: 92%

Chaotic Dynamics of Semiconductor Lasers for Secure Optical Communication

Azawe¹

2012

Optical Communication

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“…Our previous experiments revealed that the bandwidth of chaotic oscillation in laser diodes can be above 15 GHz [9]. In this research, we exploited the application of chaotic laser in OTDR and proposed a chaos C-OTDR and demonstrated experimentally that using a laser diode with optical feedback from a long fiber ring cavity as broadband chaos source, it is possible to obtain a range-independent spatial resolution of 6 cm [10].…”

Section: Introductionmentioning

confidence: 99%

Chaos correlation optical time domain reflectometry

Wang

2010

Sci. China Inf. Sci.

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We propose a novel correlation optical time domain reflectometry (C-OTDR) of using broadband chaotic light. This reflectometry has the advantage over the conventional OTDR and the pseudorandom signal C-OTDR in range-independent spatial resolution. We employ a laser diode with feedback from a long fiber ring cavity as the source of chaotic probe light. Experimental and numerical studies show that the chaotic light has broad and flat spectrum, and excellent correlation properties. Using this broadband chaotic laser, we experimentally demonstrate the proposed chaos C-OTDR for locating the fiber reflection events, and analyze the spatial resolution and dynamic range. The results show that the chaos C-OTDR can realize a range-independent resolution of 6 cm and its dynamic range is at least 25 km.

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Enhancing the Bandwidth of the Optical Chaotic Signal Generated by a Semiconductor Laser With Optical Feedback

Cited by 178 publications

References 13 publications

Optical Heterodyne Generation of High-Dimensional and Broadband White Chaos

Optical Heterodyne Generation of High-Dimensional and Broadband White Chaos

Chaotic Dynamics of Semiconductor Lasers for Secure Optical Communication

Chaos correlation optical time domain reflectometry

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