Quantum Dot-Semiconductor Optical Amplifiers
Quantum dot-semiconductor optical amplifiers (QD-SOA) are characterized by ultrafast gain recovery time (GRT) of the order of magnitude of several picoseconds, broadband gain, low noise figure (NS), high saturation output power, and high four-wave mixing (FWM) efficiency [1]. QD-SOA can be used as ultra-wideband (UWB) polarization-insensitive high-power amplifiers, high-speed signal regenerators, and wideband wavelength converters (WC) [1–5]. These unique features of QD-SOA are essentially due to the concentration of the injected electrons and holes into nanosized QD.