Previously reported quasi-optical amplifier arrays have limited bandwidth and suffer from poor input/output isolation. These prsbllems can be solved by using traveling wave antennas and distributed amplifier techniques. FII'TD simulations of a linearly tapered slot array topology demonstrate very broadband quasioptical transitions are feasible with small unitcell aperture. Experiments using a s...

We report theoretical results on the wavelength stability of a multisection master-oscillator power-amplifier emitting at 1064 nm. use traveling wave equation model to calculate optical output power and spectral maps versus currents injected into different sections device. The numerical explains quantitatively experimental findings, particularly collapse if current control section adjacent dist...

Group dynamic assessment (G-DA) grounded in Vygotsky’s socio-cultural theory (SCT) is believed to have the potential to provide a context for capturing a group of learners’ Zone of Proximal Development (ZPD) (Poehner & Lantolf, 2010; Shabani, 2010). The present study aims at testing the applicability of G-DA in identifying the mediational strategies offered by a mediator during his G-DA interac...

We describe a continuous-wave master-oscillator power-amplifier system based on a distributed Bragg reflection diode laser and an Yb doped fiber amplifier. The observed optical spectrum of the amplified seed source can be tailored to arbitrary shapes and widths between 30 MHz and greater than 1 GHz by controlling the radio frequency modulation wave form of the injection current. © 2006 American...

In this review article, a stage-convertible RF power amplifier designed with a 0.18-m RF CMOS process is described. A method to implement a low-power matching network is an essential technology for the stage-convertible power amplifier. Various low-power matching networks with distributed active transformers as an output power combiner are compared in terms of the amounts of undesired coupling...