An advanced dynamic model for multisection semiconductor optical amplifiers is Presented. It accounts for the carrier and field distributions in the longitudinal direction as well as for the facet reflectivities. The model can handle arbitrary time-varying input signals and current modulations. Here the model is used to assess intermodulation distortion and crosstalk. First, cascaded amplifiers...

Threshold current density and differential slope efficiency as function of end-mirror reflectance have been measured to estimate the internal losses of GaN-based laser diodes. An Al-coated fiber tip is used as an external micro-mirror to vary the reflectance of the end facets allowing for a continuous adjustment of mirror losses of a particular laser. The effective reflectance of the external r...

A high precision measurement technique for characterizing the propagation loss in silica low-loss optical waveguides, based on measuring the contrast of a Fabry-Perot cavity, is demonstrated. The cavity consists of the waveguide coupled to two polarization-maintaining fibers, each end facet coated with dielectric mirrors, leaving the reflectivity as an adjustable parameter. The contrast is meas...

This review focuses on theoretical foundations, experimental implementation and an overview of experimental results of the thermoreflectance spectroscopy as a powerful technique for temperature monitoring and analysis of thermal processes in semiconductor lasers. This is an optical, non-contact, high spatial resolution technique providing high temperature resolution and mapping capabilities. Th...

Few studies can be found which have directly addressed the issue of burn-out by considering the influence of teachers’ coping resources such as emotional intelligence and reflectivity especially in an EFL context. Therefore, in order to bridge this gap, the present study was conducted to investigate the relationship among teachers’ burnout, emotional intelligence, and reflectivity with a sample...

This study set out to provide empirical evidence on the relationship between EFL teachers' emotional intelligence, reflectivity, and autonomy, and their students' L2 performance. The participants of this study included 88 EFL teachers who taught English at different private English teaching institutes and their students (N = 1266). First, the teachers completed three validated questionnaires: E...

the present study was conductedto investigate the relationship among the components of teachers’ burnout, emotional intelligence, and reflectivity with a sample of 125 iranian efl teachers from several private language institutes in kurdistan and hamedan. moreover, differences in the components of teachers’ burnout, emotional intelligence, and reflectivity were examined with respect to teachers...

Abstract This study aimed to determine the relationship between L2 learners' autonomy and their cognitive style focusing on reflectivity. It was conducted with 140 Iranian M.A. EFL learners from Department of English at Islamic Azad University of Najafabad. In order to have a homogeneous sample, the second version of Quick Placement Test (QPT) was administered. Then, 85 lower ...

EFL teachers’ professional identity is a multi-dimensional and complicated concept. It is influenced by many other issues in the educational context such as reflective practice. This study intended to explore the relationship between professional identity and reflectivity of Iranian EFL teachers. It also aimed to examine how high and low reflective teachers perceive the professional identity co...