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Asymmetric multiple-quantum-well laser diodes with wide and flat gain
Oh-Kee Kwon1, Kang-ho Kim, Eun-Deok Sim
1Optical Communication Devices Department, Electronics and Telecommunications Research Institute, 161 Gajeong-Dong, Yuseong-Gu, Daejeon, 305-350 Korea. okkwon@etri.re.kr
Optics Letters
|December 3, 2003
Summary
Researchers designed asymmetric multiple-quantum-well laser diodes for wide and flat gain spectra. These laser diodes achieved a -1-dB spectral gain bandwidth of 90 nm, demonstrating their potential for advanced optical applications.
Area of Science:
- Optoelectronics
- Semiconductor Devices
- Laser Technology
Background:
- Quantum well structures are crucial for laser diode performance.
- Achieving wide and flat gain spectra is essential for applications like wavelength-division multiplexing.
- Asymmetric designs offer potential for improved spectral characteristics.
Purpose of the Study:
- To design and fabricate asymmetric multiple-quantum-well (MQW) laser diodes.
- To analyze the spectral gain properties of the fabricated MQW laser diodes.
- To achieve a wide and flat gain spectrum for enhanced laser performance.
Main Methods:
- Utilized a specific composition of compressive and tensile strained quantum wells and barrier layers.
- Designed an active layer with multiple wells of varying thicknesses (10 nm, 8 nm, 6 nm) and barrier layers (10 nm, 5 nm).
- Fabricated ridge waveguide laser diodes with antireflection coatings.
Main Results:
- The fabricated laser diodes exhibited asymmetric multiple-quantum-well structures.
- Measured spectra demonstrated a wide spectral gain bandwidth.
- A -1-dB spectral gain bandwidth as large as 90 nm was achieved.
Conclusions:
- Asymmetric MQW laser diodes can effectively produce wide and flat gain spectra.
- The specific design parameters of strained wells and barriers are critical for spectral performance.
- The achieved bandwidth indicates suitability for advanced laser applications requiring broad spectral coverage.