研究目的
Investigating the multimode dynamics and modeling of free-running and optically injected Fabry-Pérot quantum-dot lasers, focusing on the spatial hole burning in the charge-carrier distribution and its impact on the emergence of multimode dynamics.
研究成果
The study presents an accurate and efficient theoretical model for the description of spatial hole burning in quantum-dot lasers, highlighting its significance in the emergence of multimode dynamics. The findings reveal that spatial hole burning imposes a threshold in the locking strength which must be overcome to lock a laser mode, and for very strong injection, the individual locking cones converge.
研究不足
The study is limited by the complexity introduced by the interplay of a large number of laser modes in multimode semiconductor lasers and the computational cost associated with the fine spatial discretization required in time-domain traveling-wave models.
1：Experimental Design and Method Selection:
The study employs a numerical model based on a multisection delay-algebraic-equation approach for optically injected long-cavity Fabry-Pérot quantum-dot lasers, alongside experimental measurements to characterize the multimode dynamics.
2：Sample Selection and Data Sources:
A 4.5-mm-long quantum-dot ridge-waveguide Fabry-Pérot laser with a ridge width of 2 μm is used, with the optical injection supplied by a tunable laser source.
3：5-mm-long quantum-dot ridge-waveguide Fabry-Pérot laser with a ridge width of 2 μm is used, with the optical injection supplied by a tunable laser source.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The setup includes a tunable master laser, polarization controller, optical circulator, broadband optical amplifier, photodetector, power meter, and optical spectrum analyzer.
4：Experimental Procedures and Operational Workflow:
The laser dynamics under external optical injection are investigated through two-dimensional parameter sweeps in the wavelength and optical power of the master laser, covering a wavelength range of a few free spectral ranges of the FP laser.
5：Data Analysis Methods:
The laser output is characterized by monitoring the laser power and optical spectra, and recording high-speed power traces using a 12- or 35-GHz photodetector. The normalized power variance is used to distinguish constant (locked) states and oscillatory laser output.
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