Title :
Static Gain, Optical Modulation Response, and Nonlinear Phase Noise in Saturated Quantum-Dot Semiconductor Optical Amplifiers
Author :
Li, Xiaoxu ; Li, Guifang
Author_Institution :
CREOL, Univ. of Central Florida, Orlando, FL
fDate :
5/1/2009 12:00:00 AM
Abstract :
A rate equation model preserving charge neutrality for quantum-dot semiconductor optical amplifiers (QD-SOAs) is established to investigate the nonlinear gain dynamics in the saturation regime. The static gain of QD-SOA is calculated assuming overall charge neutrality and compared with that without overall charge neutrality. Optical modulation response and nonlinear phase fluctuation through saturated QD-SOAs are calculated numerically based on a small-signal analysis. The gain dynamics of QD-SOAs are strongly dependent on the current injection level. The carrier reservoir in the wetting layer and continuum state is necessary for QD-SOAs to operate with high gain, high saturation power, and ultrafast gain recovery.
Keywords :
high-speed optical techniques; optical modulation; optical saturation; quantum dots; semiconductor optical amplifiers; current injection level; nonlinear gain dynamics; nonlinear phase fluctuation; optical modulation response; saturated QD-SOA; saturated quantum-dot; semiconductor optical amplifiers; static gain; ultrafast gain recovery; wetting layer; Electrons; Fluctuations; Nonlinear equations; Optical modulation; Optical saturation; Optical signal processing; Phase modulation; Phase noise; Quantum dots; Semiconductor optical amplifiers; Gain recovery; modulation response; phase noise; quantum dots (QDs); semiconductor optical amplifiers (SOAs);
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.2009.2013100
