研究目的
To perform a systematic experimental and simulation analysis of the optical frequency combs generated by gain-switching single mode laser diodes, either free-running or subjected to optical injection, and to validate a dynamical model for the analysis of the comb generation mechanisms.
研究成果
The study demonstrated the validity of a dynamical model for analyzing optical frequency comb generation in gain-switched semiconductor lasers. The model showed excellent quantitative agreement with experimental results across a wide range of operating conditions, providing guidelines for selecting suitable operating conditions for specific comb characteristics.
研究不足
The study focuses on a specific type of laser (Discrete Mode Laser) and may not be directly applicable to other types without further research. The model's accuracy depends on the proper extraction of parameters from experiments.
1：Experimental Design and Method Selection:
The study involved a systematic experimental and simulation analysis using a dynamical model consisting of three rate equations that include stochastic noise terms.
2：Sample Selection and Data Sources:
A Discrete Mode Laser (DML) was used in all the experiments, characterized in continuous wave (CW) and gain-switching (GS) operation.
3：List of Experimental Equipment and Materials:
Equipment included a temperature controller, photodiode, Electrical Spectrum Analyser (ESA), optical circulator, polarization controller, variable optical attenuator (VOA), microwave/RF generator, and a digital signal analyser (DSA).
4：Experimental Procedures and Operational Workflow:
The laser was driven using a combination of two electrical signals: a bias current and a sinusoidal signal. Output spectra and temporal profiles were measured using specific analysers.
5：Data Analysis Methods:
The experimental results were compared with simulations, and parameters such as carrier-to-noise ratio (CNR) and spectral width were used for characterization.
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