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Design and simulation of two-section DFB lasers with short active-section lengths
Optics Express
|July 14, 2016
Summary
This study presents a novel distributed feedback laser design for high-speed communication. The proposed laser achieves over 30 GHz direct modulation bandwidth with a low threshold current, making it suitable for advanced optical networks.
Area of Science:
- Optoelectronics
- Semiconductor Lasers
- Photonics
Background:
- Distributed feedback (DFB) lasers are crucial for high-speed optical communication.
- Achieving high direct-modulation bandwidth in DFB lasers often requires complex fabrication and high threshold currents.
Purpose of the Study:
- To propose and simulate a novel DFB laser design for enhanced direct-modulation bandwidth.
- To reduce threshold current and fabrication complexity in DFB lasers.
Main Methods:
- Simulated a DFB laser with integrated reflection and active sections.
- Utilized a butt-joint re-growth avoidance technique.
- Analyzed laser performance under simulated conditions without current injection in the reflection section.
Main Results:
- Achieved high reflectivity (>0.75) in the reflection section due to self-pumping to near transparency.
- Enabled the use of a short active section (150 µm).
- Simulated a low threshold current (~5 mA) and high direct modulation bandwidth (>30 GHz).
Conclusions:
- The proposed DFB laser design offers a promising solution for high-speed direct modulation.
- The integrated design simplifies fabrication and improves performance metrics.
- This technology has the potential to advance optical communication systems.
