Broadband laser chaos generation using a quantum cascade laser with optical feedback

Chen, Chaojie; Jia, Zhiwei; Lv, Yuxiang; Li, Pu; Xu, Bingjie; Wang, Yuncai

doi:10.1364/ol.428549

Cited by 16 publications

(5 citation statements)

References 21 publications

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“…The wide-band chaotic laser predicted by Ref. [29] cannot be observed even the feedback strength is higher than 60% in our experiment.…”

Section: Introductioncontrasting

confidence: 77%

“…The descriptions of symbols and the selected values for simulation are shown in Table 1, unless stated otherwise. [24,27,29] Table 1. The used parameters for the simulation.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…[25,26] There are also some theoretical models, based on rate equations or Maxwell-Bloch equations, demonstrating periodic oscillations, [27] selfpulsations, [28] low-frequency fluctuations, [24] even wide-band chaotic laser in QCLs. [29] But these works are not enough to understand the dynamic behaviors of QCLs. Experimental observation of high-frequency dynamic oscillations is still lacking, apart from the active modulation and self-pulsations.…”

Section: Introductionmentioning

confidence: 99%

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Periodic and chaotic oscillations in mutual-coupled mid-infrared quantum cascade lasers

Jia¹,

Li²,

Guo³

et al. 2022

Chinese Phys. B

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Dynamic states in mutual-coupled mid-infrared quantum cascade lasers (QCLs) were numerically investigated in the parameter space of injection strength and detuning frequency, based on the Lang-Kobayashi equations model. Three types of period-one states were found, with different periods of injection time delay τ inj, 2τ inj, and reciprocal of detuning frequency. Besides, square-wave, quasi-period, pulse-burst and chaotic oscillations were also observed. It is concluded that external-cavity periodic dynamics and optical modes beating are the mainly periodic dynamics. The interaction of the two periodic dynamics and the high-frequency dynamics stimulated by strong injection induce the dynamic states evolution. This work helps to understand the dynamic behaviors in QCLs and shows a new way to mid-infrared wide-band chaotic laser.

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“…The wide-band chaotic laser predicted by Ref. [29] cannot be observed even the feedback strength is higher than 60% in our experiment.…”

Section: Introductioncontrasting

confidence: 77%

“…The descriptions of symbols and the selected values for simulation are shown in Table 1, unless stated otherwise. [24,27,29] Table 1. The used parameters for the simulation.…”

Section: Theoretical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Periodic and chaotic oscillations in mutual-coupled mid-infrared quantum cascade lasers

Jia¹,

Li²,

Guo³

et al. 2022

Chinese Phys. B

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“…In addition, CC dynamics are generally characterized by a very broad RF spectrum whose limit frequency is often related to the intrinsic relaxation frequency in the case of the aforementioned near-infrared lasers. This observation initially supported the claim that QCLs may exhibit chaos waveforms with tremendously large RF bandwidths [60], but as we will see experimentally, the chaos bandwidth in QCLs seems to be limited by various complex parameters such as thermo-optical coupling within the quantum structure. That said, the lack of very high-speed (100 GHz) detectors in the mid-IR prevents from any definitive conclusion about both the absence of driving frequency and the limited bandwidth of non-linear dynamics.…”

Section: Lffs CC and Chaossupporting

confidence: 66%

A review of recent results of mid-infrared quantum cascade photonic devices operating under external optical control

Spitz¹,

Grillot²

2022

J. Phys. Photonics

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The purpose of this article is to gather recent findings about the non-linear dynamics of distributed feedback quantum cascade lasers, with a view on practical applications in a near future. As opposed to other semiconductor lasers, usually emitting in the visible or the near-infrared region, quantum cascade laser technology takes advantage of intersubband transitions and quantum engineering to emit in the mid-infrared and far-infrared domain. This peculiarity and its physical consequences were long considered as a detrimental characteristic to generate non-linear dynamics under external optical control. However, we show that a wide diversity of phenomena, from high-dimensional chaos to giant pulses can be observed when the quantum cascade laser is under external optical feedback or under optical injection and with a continuous current bias. Most of these phenomena have already been observed in other semiconductor lasers under optical feedback or under optical injection, which allows us comparing quantum cascade lasers with their interband counterparts.

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“…The optical feedback dynamics in THz QCLs are very different from that in MIR-QCLs due to their smaller value of the linewidth enhancement factor. The nonlinear dynamics that include the typical five feedback regimes found in diode lasers [ 13 ] have been observed in MIR-QCLs [ 17 , 32 ]. However, only frequency splitting and associated self-pulsations were observed in optically reinjected THz QCLs [ 9 ], where we only considered the first ECRT in the theoretical models.…”

Section: Resultsmentioning

confidence: 99%

Self-Pulsations in Terahertz Quantum Cascade Lasers under Strong Optical Feedback: The Effect of Multiple Reflections in the External Cavity

Loh

Taimre

et al. 2022

Sensors

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We have recently reported the self-pulsation phenomenon under strong optical feedback in terahertz (THz) quantum cascade lasers (QCLs). One important issue, however, we left open: the effect of multiple round trips in the external cavity on the laser response to feedback. Our current analysis also casts additional light on the phenomenon of self-pulsations. Using only one external cavity round trip (ECRT) in the model has been the common approach following the seminal paper by Lang–Kobayashi in 1980. However, the conditions under which the Lang–Kobayashi model, in its original single-ECRT formulation, is applicable has been rarely explored. In this work, we investigate the self-pulsation phenomenon under multiple ECRTs. We found that the self-pulsation waveform changes when considering more than one ECRT. This we attribute to the combined effect of the extended external cavity length and the frequency modulation of the pulsation frequency by the optical feedback. Our findings add to the understanding of the optical feedback dynamics under multiple ECRTs and provide a pathway for selecting the appropriate numerical model to study the optical feedback dynamics in THz QCLs and semiconductor lasers in general.

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Broadband laser chaos generation using a quantum cascade laser with optical feedback

Cited by 16 publications

References 21 publications

Periodic and chaotic oscillations in mutual-coupled mid-infrared quantum cascade lasers

Periodic and chaotic oscillations in mutual-coupled mid-infrared quantum cascade lasers

A review of recent results of mid-infrared quantum cascade photonic devices operating under external optical control

Self-Pulsations in Terahertz Quantum Cascade Lasers under Strong Optical Feedback: The Effect of Multiple Reflections in the External Cavity

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