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Mode locking in a tapered two-section quantum dot laser: design and experiment.
Optics Letters
|June 16, 2018
Summary
This study numerically predicts and experimentally verifies stable, high-power picosecond pulse generation from quantum dot lasers. Understanding bias conditions helps avoid detrimental pulse train instabilities for time-critical applications.
Area of Science:
- Optoelectronics
- Semiconductor Lasers
- Quantum Dot Devices
Background:
- Quantum dot lasers offer unique properties for advanced photonic applications.
- Achieving high-power, stable mode-locked pulses is crucial for demanding applications.
- Understanding laser dynamics and stability regions is essential for device design.
Purpose of the Study:
- To numerically predict and experimentally verify pulse generation and stability in a tapered two-section InAs/InGaAs quantum dot laser.
- To design a laser source capable of generating stable mode-locked pulses at 15 GHz with picosecond width and >1 W output power.
- To identify device stability regions based on bias conditions and understand potential instabilities.
Main Methods:
- Numerical simulations using a multi-section delayed differential equation model.
- Experimental verification of predicted laser performance and stability.
- Analysis of pulse train characteristics and amplitude modulations under varying bias conditions.
Main Results:
- Successful design and verification of a quantum dot laser generating stable mode-locked pulses (>1 W, picosecond width, 15 GHz).
- Identification of distinct stability regions and associated pulse train instabilities (broadband or multi-periodic amplitude modulations).
- Correlation of instabilities with net gain window characteristics outside the optical pulse.
Conclusions:
- The numerical model accurately predicts laser performance and aids in designing stable, high-power quantum dot lasers.
- Understanding bias-dependent stability regions is key to avoiding detrimental pulse train instabilities.
- Results are valuable for developing reliable pulsed laser sources for time-critical applications.
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