Novel Closed-Form Model for Multiple-State Quantum-Dot Semiconductor Optical Amplifiers

• Published in: IEEE journal of quantum electronics Vol. 44; no. 7; pp. 652 - 657
• Main Author: Qasaimeh, O.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Analytical model; Density; effective saturation density; Energy states; Equations; Exact sciences and technology; Exact solutions; Fundamental areas of phenomenology (including applications); Laser optical systems: design and operation; Mathematical analysis; Mathematical models; Nonlinear optics; Optical saturation; Optical sensors; Optical wavelength conversion; Optics; Photon density; Physics; quantum dot (QD); Quantum dot lasers; Quantum dots; Resonators, cavities, amplifiers, arrays, and rings; Saturation; Semiconductor optical amplifiers; semiconductor-optical amplifier (SOA); Stimulated emission; quantum dot (QD); Ground states; Quantum dots; Digital simulation; Optimization method; Theoretical study; Excited states; Optical gain; Semiconductor optical amplifiers; Analytical model; Quantum dot devices; Analytical method; effective saturation density; Analytical solution; semiconductor-optical amplifier (SOA)
• ISSN: 0018-9197; 1558-1713
• DOI: 10.1109/JQE.2008.922324

Novel closed-form model for multiple-state quantum-dot semiconductor optical amplifiers (QD-SOAs) is derived. The model takes into account the effect of the ground state, excited state and the wetting layer. The model is simple, accurate and exhibits negligible computational time compared with numerical simulation. In addition, the derived model is valid for arbitrary applied current and input photon density and is interesting for device design and optimization. Analytical expressions for the optical gain, effective saturation density, maximum output density and the transparency current are also derived. Our model revealed that the effective saturation density of QD-SOAs strongly depends on the photon density and the applied current.