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

Volume

45

Issue

5

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

499

Lastpage

505

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);

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/JQE.2009.2013100

Filename

4810189