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Optical detection and modulation at 2µm-2.5µm in silicon
Optics Express
|June 13, 2014
Summary
Silicon photonics show enhanced performance for 2μm telecommunications. The plasma dispersion effect is more effective, and defect-based photodetectors achieve 2-2.5μm detection, though responsivity decreases with wavelength.
Area of Science:
- Photonics and optical communications
- Semiconductor device physics
- Materials science
Background:
- The 2μm wavelength region is a promising frontier for advanced telecommunication systems.
- Silicon photonics offers a scalable platform for optical modulation and photodetection.
Purpose of the Study:
- To experimentally characterize silicon-based plasma dispersion effect (PDE) optical modulation at 2μm.
- To evaluate defect-based photodetector performance in the 2-2.5μm range.
- To compare PDE effectiveness at 2μm versus traditional telecom wavelengths.
Main Methods:
- Experimental characterization of silicon PDE optical modulators.
- Fabrication and testing of defect-based photodetectors.
- Performance evaluation across the 2-2.5μm wavelength spectrum.
Main Results:
- Plasma dispersion effect in silicon shows significantly enhanced modulation efficiency at 2μm compared to 1.3μm and 1.55μm.
- Defect-based photodetectors successfully achieved optical detection within the 2-2.5μm range.
- Photodetector responsivity decreased as wavelength increased beyond 1.55μm.
Conclusions:
- Silicon photonics is highly effective for optical modulation in the emerging 2μm telecommunication band.
- Defect-based photodetectors are viable for 2-2.5μm detection, with performance optimization needed for longer wavelengths.
