We present a transfer-matrix method capable of simulating the effects of nonuniform gratings on the filtering, amplification, and bistability characteristics of distributed feedback (DFB) semiconductor laser amplifiers. The linewidth enhancement factor is incorporated in a way that allows direct gaintuning of the bistability hysteresis. As an example, we compare a /4 phase-shifted DFB amplifier...

   Self-heating leads to a temperature rise of the laser diode and limits the output power and efficiency due to increased loss and decreased differential gain. To control device self-heating, it is required to design the laser structure with a low optical loss, while the heat flux must spread out of the device efficiently. In this study, a new asymmetric waveguide design is proposed and th...

This paper describes a new unconditionally stable numerical method for the full-wave physical modeling of semiconductor devices by a combination of the finite-difference Laguerre time-domain (FDLTD) and alternative direction implicit finite-difference time-domain (ADI-FDTD) approaches. The unconditionally stable method by using FDLTD scheme for the electromagnetic model and semi-implicit ADI-FD...

Gain Clamped Semiconductor Optical Amplifier (GC-SOA), All Optical flip flop (AOff), Distributed bragg reflector (DBR), bistability property ABSTRACT In this article, the effect of coupling coefficient variations on an all optical Flip Flop performance based on gain clamped semiconductor optical amplifier according to distributed bragg reflectors by extensive band model of wave diffusion in tim...

The parameters of an encapsulated semiconductor optical amplifier (SOA) are obtained by a proper extraction algorithm using a technique based both on measurements and modeling. The theoretical model is based on rate equations and the experiments use continuous wave optical gain curves measured for different injected currents and optical input powers. The algorithm analyses the derivatives of th...

In this thesis, we study all-optical processing techniques based on non-linear semiconductor optical amplifiers for the functionalities of second and third generation optical networks. In particular, devices for all-optical wavelength conversion with regenerative properties have been investigated. The configurations under investigation are based on the non-linear four-wave mixing process which ...

introduction: laser-assisted vaporization of prostate tissue by means of the potassiumtitanyl- phosphate (ktp) laser is in clinical use. alternative laser sources are available but are lacking clinical experience.the 980 nm wavelength diode laser provides good hemostasis, in addition to a more rapid ablation rate. the aim of this study is approving the capability, feasibility, and good post-ope...

An experimental technique based on frequency-resolved four-wave mixing is proposed for the investigation of phonon-assisted capture of electrons and holes in electrically pumped semiconductor quantum wells. We show how this technique can be used to directly measure the intrinsic capture lifetime, with no need for involved numerical fits. We also present experimental results from an application ...