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Statistical properties of low-frequency fluctuations during single-mode operation in distributed-feedback lasers:
Optics Letters
|December 15, 2007
Summary
This study confirms the Lang-Kobayashi model for distributed-feedback lasers, detailing experimental evidence of low-frequency fluctuations (LFF) and coherence collapse. Quantitative agreement between simulations and experiments validates the model
Area of Science:
- Physics
- Optoelectronics
- Laser Technology
Background:
- Distributed-feedback (DFB) lasers are crucial in optical communications.
- Understanding instabilities in DFB lasers is essential for stable operation.
- The Lang-Kobayashi model is a key theoretical framework for semiconductor laser dynamics.
Purpose of the Study:
- To experimentally and numerically investigate feedback-induced instabilities in single-mode DFB lasers.
- To validate the fundamental assumptions of the Lang-Kobayashi model.
- To provide quantitative agreement between experimental observations and theoretical modeling.
Main Methods:
- Extensive experimental investigations of DFB laser dynamics.
- Numerical simulations based on the Lang-Kobayashi model.
- Long-time statistical analysis of laser output characteristics.
Main Results:
- Experimental confirmation of low-frequency fluctuation (LFF) and coherence collapse.
- Observation of alternation between LFF and stable laser emission.
- Quantitative agreement between experimental data and model predictions, including scaling laws related to injection current.
Conclusions:
- The Lang-Kobayashi model accurately describes feedback-induced instabilities in single-mode DFB lasers.
- Experimental results align quantitatively with numerical simulations.
- The study validates the model's predictive power for laser dynamics under various operating conditions.
