Abstract
The optical gain of quantum-dot (QD) semiconductor optical amplifier (SOA) is usually seriously dependent on polarization, we propose QD coupled to tensile-strained quantum-well (QW) structure to obtain polarization insensitive QD SOA. A polarization-dependent coupled carrier rate equation model and multi-section SOA model are used to study the performance of QD-coupled QW SOA. Gain dependence on polarization is studied, TE gain contribution by QWs and QDs is compared, and carrier distribution competition among QWs and QDs is analyzed. It is shown that polarization insensitive gain can be realized in a relatively wide range of wavelength if QD-coupled tensile-strained QW SOA is properly designed.
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