Strong Optical Feedback Stabilized Quantum Cascade Laser

Zhao, Binbin; Wang, Xing‐Guang

doi:10.1021/acsphotonics.0c00189

Cited by 24 publications

(12 citation statements)

References 63 publications

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“…This is in contrast to QCLs, where the chaotic LFFs mostly occur at near-threshold currents 22 – 25 . Our previous work has shown that QCLs operated far above the threshold were much more stable 80 , 81 . When the ICL is pumped at 105 mA with an output power of 1.7 mW, both the bifurcation diagram in Fig.…”

Section: Resultsmentioning

confidence: 94%

Mid-infrared hyperchaos of interband cascade lasers

et al. 2022

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Chaos in nonlinear dynamical systems is featured with irregular appearance and with high sensitivity to initial conditions. Near-infrared light chaos based on semiconductor lasers has been extensively studied and has enabled various applications. Here, we report a fully-developed hyperchaos in the mid-infrared regime, which is produced from interband cascade lasers subject to the external optical feedback. Lyapunov spectrum analysis demonstrates that the chaos exhibits three positive Lyapunov exponents. Particularly, the chaotic signal covers a broad frequency range up to the GHz level, which is two to three orders of magnitude broader than existed mid-infrared chaos solutions. The interband cascade lasers produce either periodic oscillations or low-frequency fluctuations before bifurcating to hyperchaos. This hyperchaos source is valuable for developing long-reach secure optical communication links and remote chaotic Lidar systems, taking advantage of the high-transmission windows of the atmosphere in the mid-infrared regime.

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Section: Resultsmentioning

confidence: 94%

Mid-infrared hyperchaos of interband cascade lasers

et al. 2022

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“…As shown in Figure 1b, the free-running QCL exhibits a lasing threshold of 245 mA and emits a single mode around 2210/cm or 4.53 µm (see inset). The optical linewidth is extracted from the analysis of the measured frequency noise spectrum [16]. Figure 1c shows that the optical linewidth is around 16 MHz.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

“…The slight increase in the linewidth with the pump current can be attributed to the non-uniform carrier distribution induced by the spatial hole-burning effect [34,35]. On the other hand, the small fluctuations of the linewidth at 270 mA and 290 MA are due to the fact that the operation temperature is slightly tuned at each pump current to meet the frequency requirement of the frequency discriminator [16,36].…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

“…In comparison with common quantum well lasers, mid-infrared quantum cascade lasers (QCLs) are found to be highly stable against optical feedback due to their picosecond carrier lifetime [13][14][15]. Our previous work significantly narrowed the spectral linewidth of a QCL, based on its high stability, by using strong optical feedback [16]. However, QCLs with optical feedback did produce low-frequency fluctuations, or chaos, under peculiar operation conditions, such as near-threshold pump current, pulsed pump current, and low operation temperature [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Modulation Characteristics of Period-One Oscillations in Quantum Cascade Lasers

2021

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Quantum cascade lasers subject to tilted optical feedback produce periodic oscillations, quasi-periodic oscillations, and low-frequency oscillations. This work presents the modulation characteristics of period-one (P1) oscillations in a quantum cascade laser with tilted optical feedback. The electrical signal at the oscillation frequency is more than 50 dB higher than the noise level, and the electrical linewidth is less than 2.0 kHz. This electrical linewidth is about four orders of magnitude narrower than the optical linewidth (around 16 MHz) of the free-running laser, which suggests that the optical sidebands induced by the P1 oscillations are highly coherent with the main optical mode. In addition, the modulation depth of the optical signal is found to be in the range of 1% to 3.5%. In addition, it is verified in the simulations that the P1 oscillations induce not only amplitude modulation but also frequency modulation due to the phase-amplitude coupling effect.

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“…It is relevant to note that EOF does not always lead to destabilization and is of utter interest for controlling the semiconductor laser properties. For instance, it is possible to tune and stabilize the linewidth of lasers by applying a strong optical feedback [48][49][50][51]. However, EOF can also have some downside effects in the case destabilization is the most dominant phenomenon, generally for high feedback strengths.…”

Section: Dynamical Regimesmentioning

confidence: 99%

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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Strong Optical Feedback Stabilized Quantum Cascade Laser

Cited by 24 publications

References 63 publications

Mid-infrared hyperchaos of interband cascade lasers

Mid-infrared hyperchaos of interband cascade lasers

Modulation Characteristics of Period-One Oscillations in Quantum Cascade Lasers

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

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