Semiconductor optical amplifiers grown on a metamorphic substrate for long wavelength applications

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Physics

Background:

• Semiconductor optical amplifiers (SOAs) are crucial for optical communication networks.
• Extending the operational wavelength of SOAs to longer wavelengths is a key research area.
• Metamorphic substrates offer a pathway to grow novel semiconductor heterostructures.

Purpose of the Study:

• To develop a semiconductor optical amplifier with extended long-wavelength accessibility.
• To investigate the impact of tensile strain on quantum wells in long-wavelength SOAs.
• To demonstrate the fabrication of a laser diode from the same device structure.

Main Methods:

• Growth of a semiconductor optical amplifier on an Indium Arsenide Phosphide (InAsP) metamorphic substrate.
• Incorporation of quantum wells with significant tensile strain within the amplifier structure.
• Characterization of optical gain at wavelengths exceeding 1640 nm.
• Fabrication of a laser diode utilizing the developed device structure.

Main Results:

• The semiconductor optical amplifier demonstrated optical gain at wavelengths beyond 1640 nm.
• The device successfully operated with large tensile strain in the quantum wells.
• A functional laser diode was fabricated from the same epitaxial structure, confirming device versatility.

Conclusions:

• Growth on InAsP metamorphic substrates effectively extends the accessible wavelength range of semiconductor optical amplifiers.
• Tensile-strained quantum wells are compatible with long-wavelength amplification beyond 1640 nm.
• The developed device structure is suitable for both optical amplification and laser diode applications in extended wavelength regions.