研究目的
Investigating the route to chaos of a semiconductor laser subjected to optical feedback from a distant reflector.
研究成果
The review highlights the complex dynamics of semiconductor lasers subjected to optical feedback, showing that the route to chaos involves a sequence of bifurcations that depend on the laser's bias current and feedback level. For lasers biased close to threshold, a bifurcation cascade alternates between stable and chaotic regimes. For higher currents, the route involves a progression from quasiperiodic-like behavior to fully developed coherence collapse, with locking between dynamical frequencies playing a key role. The findings underscore the richness of dynamical behaviors in these systems and the challenges in modeling them accurately.
研究不足
The study is limited to the experimental observations of the research group and does not cover all possible dynamical regimes of semiconductor lasers with optical feedback. The Lang and Kobayashi model, while useful, has limitations in predicting the full range of observed behaviors.
1：Experimental Design and Method Selection:
The study involves monitoring the optical intensity, voltage, and optical spectrum of semiconductor lasers under varying feedback levels.
2：Sample Selection and Data Sources:
A range of 1550 nm DFB lasers, including packaged and unpackaged quantum well and quantum dash-based diodes, were used.
3：List of Experimental Equipment and Materials:
The setup includes laser diodes, mirrors, quarter-wave plates, polarizers, beam splitters, optical isolators, photodetectors, bias tees, amplifiers, multimeters, high-resolution optical spectrum analyzers, and real-time oscilloscopes.
4：Experimental Procedures and Operational Workflow:
The laser's temperature and current are stabilized, and it is subjected to optical self-feedback from an external mirror. The feedback level is adjusted using a variable attenuator. The optical intensity is monitored with a fast photodetector, and the DC component of the laser voltage is determined with a multimeter. The AC voltage across the laser diode is measured with a real-time oscilloscope. The optical spectrum is tracked with a high-resolution optical spectrum analyzer, and a heterodyne technique is used to measure the optical phase.
5：Data Analysis Methods:
The data analysis involves examining the probability density function of the extrema of the optical intensity as a function of the feedback strength, and analyzing the laser voltage, optical spectrum, and optical phase in various regimes.
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