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Gallium arsenide deep-level optical emitter for fibre optics
Janet L Pan1, Joseph E McManis, Thomas Osadchy
1Yale University, PO Box 208284, New Haven, Connecticut 06520-8284, USA. janet.pan@yale.edu
Nature Materials
|May 10, 2003
Summary
Researchers developed a novel gallium arsenide (GaAs) light-emitting diode (LED) for fiber optics. This breakthrough enables 1.5 micrometer wavelength emission, crucial for high-speed communications, using deep-level transitions.
Area of Science:
- Optoelectronics
- Materials Science
- Telecommunications
Background:
- Integrated optoelectronics are vital for high-speed communications.
- Gallium arsenide (GaAs) is preferred for integrated optoelectronics due to cost and reliability, but its 0.85 micrometer wavelength is unsuitable for fiber optics.
- Indium phosphide (InP) is an alternative but costly.
Purpose of the Study:
- To demonstrate a light-emitting diode (LED) emitting at 1.5 micrometer fiber-optic wavelengths using GaAs.
- To overcome the limitations of GaAs bandgap wavelength for telecommunications.
- To enable lattice-matched fiber-optic components on GaAs integrated circuits.
Main Methods:
- Fabrication of a GaAs-based light-emitting diode (LED).
- Utilizing optical transitions from arsenic antisite (As(Ga)) deep levels.
- Experimental characterization of optical power and speed.
Main Results:
- Demonstrated the first GaAs LED emitting at 1.5 micrometer fiber-optic wavelengths.
- Achieved significant internal optical power (24 mW) and high speed (terahertz range).
- Presented theoretical analysis of the efficiency-bandwidth product for deep-level optical emitters.
Conclusions:
- This work enables fiber-optic components that are lattice-matched to GaAs integrated circuits.
- Deep-level transitions in GaAs offer a viable path for cost-effective, high-performance optoelectronic devices.
- The findings pave the way for advanced, high-speed communication systems.