研究目的
Investigating chaotic and spiking dynamics in mid-infrared quantum cascade lasers operating under external optical feedback and emitting at 5.5 μm and 9 μm, to deepen the understanding of the route to chaos in the case of continuous-wave and current modulation operation.
研究成果
The study concludes that QCLs exhibit different routes to chaos depending on the pumping conditions, with quasi-continuous wave operation leading to more complex chaos and continuous wave pumping resulting in more regular spiking dynamics. The entrainment phenomenon allows for precise triggering of spiking, which is promising for secure communications. The findings are significant for the development of compact secure high-speed communication systems in the mid-infrared domain.
研究不足
The study is limited by the technical constraints of the experimental setup, such as the bandwidth of the current source and the stability of the optical path for continuous bias operation. Additionally, the complexity of chaos synchronization for secure communications is noted as a potential challenge.
1：Experimental Design and Method Selection:
The study involves analyzing the non-linear dynamics of quantum cascade lasers (QCLs) under external optical feedback and current modulation, using bifurcation diagrams to study the route to chaos.
2：Sample Selection and Data Sources:
The devices under investigation are QCLs manufactured by mirSense, emitting at 5.5 μm and 9 μm, referred to as Type 1 and Type 2, respectively.
3：5 μm and 9 μm, referred to as Type 1 and Type 2, respectively.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The experimental setup includes a cryostat or a QCL mount for temperature control, a focusing mid-infrared lens, a gold-plated mirror for external optical feedback, a polarizer to control feedback ratio, a non-polarizing beam splitter (NPBS), a Mercury-Cadmium-Telluride detector (MCT), a low-noise amplifier, a fast oscilloscope, and a real-time spectrum analyzer (RSA). The QCL is powered by a low-noise current source (Wavelength Electronics QCL2000 LAB) and modulated with a waveform generator (Rigol DG1022Z).
4：Experimental Procedures and Operational Workflow:
The QCLs are subjected to external optical feedback and current modulation to study their chaotic and spiking dynamics. The feedback ratio is varied to observe different regimes such as stable operation and low-frequency fluctuations (LFF). The dynamics are analyzed using time traces and RF spectra.
5：Data Analysis Methods:
The non-linear dynamics are analyzed with bifurcation diagrams, and the RF spectra are analyzed to understand the frequency components of the chaotic signals.
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