Wideband and flat-spectrum chaos generation from a semiconductor laser with strong dispersive light feedback

Wang, Longsheng; He, Qingqing; Wang, Anbang; Wang, Yuncai

doi:10.1587/nolta.13.36

NOLTA

2022

DOI: 10.1587/nolta.13.36

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Wideband and flat-spectrum chaos generation from a semiconductor laser with strong dispersive light feedback

Longsheng Wang¹,

Qingqing He²,

Anbang Wang³

et al.

Abstract: We propose and experimentally demonstrate a method of generating wideband and flat-spectrum chaos from a simple device configuration composed of a semiconductor laser subject to strong dispersive light feedback from a chirped fiber Bragg grating (CFBG). The dispersive feedback light induces external-cavity modes with irregular mode separations which beat with the internal modes of laser. This physical process of beating introduces more highfrequency oscillations and thus removes the domination of relaxation os… Show more

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Cited by 2 publications

References 36 publications

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Multi-channel broadband optical chaos generation assisted by phase modulation and CFBG feedback

Zhang,

Jiang,

Sun

et al. 2024

Opt. Express

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In this paper, we propose a novel and simple multi-channel broadband optical chaos generation scheme based on phase modulation and chirped fiber Bragg grating (CFBG). Firstly, phase modulation is introduced to generate more new frequency components to broaden the spectrum of the phase chaos. Meanwhile, the accumulated dispersion from CFBG distorts the intensity chaos, converts phase chaos to intensity chaos, and weakens the laser relaxation oscillation. This process would lead to energy redistribution in the power spectrum, effectively increasing the chaotic bandwidth. Then, the wavelength detuning between CFBG and the semiconductor laser is introduced to enhance the chaotic bandwidth further. The experiment results show that the 10 dB bandwidths of the five channels are up to 31.0 GHz, 34.3 GHz, 36.3 GHz, 40 GHz, and 40 GHz, respectively. Note that the maximum bandwidth of the PD in our experiment is limited to 40 GHz. In addition, the multi-channel chaotic signals obtained from the experiment system are used to generate multi-channel physical random numbers. After the post-processing operations, the total rate of five parallel high-speed physical random number generation channels is 4.64 Tbit/s (160 GSa/s × 5bit × 1 channel + 160 GSa/s × 6bit × 4 channels). As far as we know, this is the highest record of using external cavity feedback semiconductor lasers to generate random numbers, which has great potential to meet the security requirements of next-generation Tbit/s optical communication systems.

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Multi-channel broadband optical chaos generation assisted by phase modulation and CFBG feedback

Zhang,

Jiang,

Sun

et al. 2024

Opt. Express

View full text Add to dashboard Cite

show abstract

Fast physical random bit generation of wideband flat chaos signal based on filter feedback

Liu¹,

Yuan²,

Zhou³

et al. 2022

Acta Phys. Sin.

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Chaotic lasers are characterized with wide spectrum and noise-like features, which have been extensively used in various fields, such as secure communications and random bit generation (RBG). Since the physical RBG using optical chaos was demonstrated firstly by Uchida et al., the optical chaos has been widely investigated in terms of chaos bandwidth and flatness, which determines the rate and randomness of RBG. Due to the natural stability of semiconductor lasers, external perturbation is required to generate chaotic signals, such as optical injection, current modulation, and optical feedback. Among them, a semiconductor laser with optical feedback has attracted wide attention because of its simple structure and rich dynamic behaviors. Nonetheless, this configuration suffers from the influence of the relaxation oscillation, which results in a limited bandwidth (a few GHz) and an uneven power spectrum. To obtain broad-spectrum chaotic signals, considerable efforts have been dedicated in recent years. However, these solutions are associated with complex structures that require delicate manipulation because multiple parameters should be matched, so the cost of some of these schemes in terms of the system complexity can potentially outweigh the benefits.In this paper, we take into account the incorporation of an optical filter as well as an amplifier into the feedback loop of a conventional optical feedback system to generate broadband chaotic signals. The effects of the filter detuning frequency and feedback power on the bandwidth and flatness of the chaotic output are investigated experimentally. The experimental results demonstrate that by appropriately adjusting the feedback power and detuning frequency, both the low-frequency and high-frequency components of the chaotic output power spectrum can be increased, and the maximum chaotic bandwidth can reach 24.4 GHz with a flatness of 5.7 dB. This phenomenon is attributed to the fact that the physical process of beating between the filtered mode and the internal modes of the laser. Furthermore, the optimized chaotic output is processed by retaining the 4 least significant bits and implementing the delayed exclusive-OR (XOR) operation. Our scheme is capable of generating physical random numbers of the bit rate of 320 Gbit/s, which successfully pass the standard randomness test, i.e., the NIST test (NIST SP 800-22).

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Wideband and flat-spectrum chaos generation from a semiconductor laser with strong dispersive light feedback

Cited by 2 publications

References 36 publications

Multi-channel broadband optical chaos generation assisted by phase modulation and CFBG feedback

Multi-channel broadband optical chaos generation assisted by phase modulation and CFBG feedback

Fast physical random bit generation of wideband flat chaos signal based on filter feedback

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