In this paper, based on the switching cell approach, a unified steady state analysis for families of soft-switching dc–dc converters with complete unified design equations will be presented. The concept of the unified approach and step by step procedure for a generalized process are discussed and applied to selected soft-switching families such as zero-voltage-switching (ZVS) and zero-current-s...

The Digital pulse width modulators are used for digital control applications. When the requirement of clock frequency exceeds the required limit the switching frequency of the power converter also increased. In this paper a new architecture for digital pulse width modulator is proposed. The proposed method is based on digital clock manager which is present in the Spartan 3 FPGA. The architectur...

We demonstrate an all-optical technique for the elimination of timing jitter in short pulse transmission systems. The technique relies on pulse pre-shaping followed by optical switching in a periodically poled lithium niobate waveguide via cascaded second harmonic and difference frequency generation. ©2010 Optical Society of America OCIS codes: (060.2330) Fiber optics communications; (130.3730)...

Current induced magnetization switching by spin-orbit torques offers an energy-efficient means of writing information in heavy metal/ferromagnet (FM) multilayer systems. The relative contributions of field-like torques and damping-like torques to the magnetization switching induced by the electrical current are still under debate. Here, we describe a device based on a symmetric Pt/FM/Pt structu...

The functionality of computer memory elements is currently based on multi-stability, driven either by locally manipulating the density of electrons in transistors or by switching magnetic or ferroelectric order. Another possibility is switching between metallic and insulating phases by the motion of ions, but their speed is limited by slow nucleation and inhomogeneous percolative growth. Here w...

We demonstrate ultrafast polarization-independent switching, using an asymmetric Fabry-Pérot device, based on bulk InGaAsP, which can operate at high repetition rates. Our preliminary device exhibited 5.5ps switching time, 12dB contrast, and 0.5pJ/μm switching energy density. © 1999 Optical Society of America OCIS codes: (230.1150) All-optical devices; (190.7110) Ultrafast nonlinear optics; (23...

We demonstrate a new experimental approach for flexible femtosecond pulse generation in the mid-IR by use of difference-frequency generation from two tightly synchronized Ti:sapphire lasers. The resultant mid-IR pulse train can be easily tuned, with an adjustable repetition frequency up to 100 MHz, a pulse energy of approximately 1.5 x 10(-13) J, and an intensity noise similar to that of the Ti...

| In this paper we discuss theoretical and experimental aspects of nonlinear pulse propagation in long-period ber gratings. We derive nonlinear coupled mode equations for co-propagating core and cladding modes in a long-period ber grating and show that the intensity dependent index can be used to tune the mode coupling, thereby creating a mechanism for pulse shaping and all-optical switching. E...

A control algorithm is presented that addresses the stability issues inherent to the operation of monolithic mode-locked laser diodes. It enables a continuous pulse duration tuning without any onset of Q-switching instabilities. A demonstration of the algorithm performance is presented for two radically different laser diode geometries and continuous pulse duration tuning between 0.5 ps to 2.2 ...

We present passively Q-switched microchip lasers with items bonded by spin-on-glass glue. Passive Q-switching is obtained by a semiconductor saturable absorber mirror. The laser medium is a Nd:YVO(4) crystal. These lasers generate pulse peak powers up to 20 kW at a pulse duration as short as 50 ps and pulse repetition rates of 166 kHz. At 1064 nm, a linear polarized transversal and longitudinal...