Related Experiment Videos
Polarization anisotropy in vertical-cavity semiconductor optical amplifiers.
Michael Sánchez1, Pengyue Wen, Matthias Gross
1Department of Electrical and Computer Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0407, USA.
Optics Letters
|September 11, 2004
Summary
Vertical-cavity semiconductor optical amplifiers (VCSOAs) exhibit polarization-dependent gain due to non-degenerate polarization states. This gain difference arises from electro-optic birefringence, not circular symmetry.
Area of Science:
- Optoelectronics
- Semiconductor physics
- Photonics
Background:
- Vertical-cavity semiconductor optical amplifiers (VCSOAs) are crucial optical components.
- Their polarization characteristics are often assumed to be degenerate due to device geometry.
- Understanding polarization-dependent gain (PDG) is vital for device performance.
Purpose of the Study:
- To measure and determine the cause of PDG in VCSOAs.
- To investigate the validity of the degeneracy assumption for VCSOA polarization states.
- To identify the physical mechanism responsible for frequency splitting between polarization states.
Main Methods:
- Experimental measurement of PDG in VCSOAs.
- Analysis of polarization states and their frequency differences.
- Investigation of electro-optic effects influencing polarization.
Main Results:
- VCSOAs do not exhibit degenerate polarization states in practice.
- A dominant linear polarization state was observed.
- A small frequency difference between polarization states was measured, causing PDG.
- Electro-optic birefringence was identified as the cause of this frequency splitting.
Conclusions:
- The assumption of degenerate polarization states in VCSOAs is incorrect.
- PDG in VCSOAs is primarily caused by the frequency difference between non-degenerate polarization states.
- Electro-optic birefringence is the underlying physical mechanism driving this phenomenon.