For the first time, the feasibility of large port count nanosecond reconfiguration time optical switches is demonstrated using a novel hybrid approach, where Mach-Zehnder interferometric (MZI) switches provide low loss high speed routing with short semiconductor optical amplifiers (SOAs) being integrated to enhance extinction. By repeatedly passing signals through a monolithic hybrid dilated 2...

In this paper, we develop a variable-frequency pulse width modulation (VFPWM) circuit for input control of 6.78-MHz resonant wireless power transfer (WPT) systems. The zero-voltage switching relies on the adjustments both duty cycle and frequency class-E amplifier used in WPT as transmission unit. High-frequency wave integrated circuits exist, but some have insufficiently high or unfavorable re...

This paper proposes the use of double-frequency (DF) buck converter architecture consisting of a merged structure of high and low frequency buck cells as a candidate topology for envelope elimination and restoration (EER) applications and integrated power supply of RF power amplifiers (RFPA) to obtain favorable tradeoffs in terms of efficiency, switching ripple, bandwidth, and tracking capabili...

A biopotential amplifier for single supply operation is presented. It uses a Driven Right Leg Circuit (DRL) to drive the patient's body to a DC common mode voltage, centering biopotential signals with respect to the amplifier's input voltage range. This scheme ensures proper range operation when a single power supply is used. The circuit described is especially suited for low consumption, batte...

We observe pulse breakup for 650-fs pulses propagating through 9 m of optical fiber followed by an InGaAsP amplifier. The pulses are broadened by a factor of two, and a second peak appears at about 2 ps after the main peak. To identify the responsible mechanisms, we solve numerically the propagation equations including nonlinear carrier dynamics and gain dispersion. We attribute the broadening ...

1 This work was partly supported by a grant from the Engineering and Physical Sciences Research Council (United Kingdom) and Advanced Power Components (Rochester, United Kingdom). Abstract The use of behavioural modelling for operational amplifiers has been well known for many years and previous work has included modelling of specific fault conditions using a macro-model. In this paper, the mod...

Although patterning effects (PEs) are known to be a limiting factor of ultrafast photonic switches based on semiconductor optical amplifiers (SOAs), a simple approach for their evaluation in numerical simulations and experiments is missing. In this work, we experimentally investigate and verify a theoretical prediction of the pseudo random binary sequence (PRBS) length needed to capture the ful...

In modern wireless communication systems it is required that the power amplifier could operate with high efficiency, high linearity, and low harmonic output level simultaneously. To increase efficiency of the power amplifier, a switching-mode Class E mode technique can be applied. This kind of a power amplifier requires an operation in saturation mode resulting in a poor linearity, and therefor...

34 LLE Review, Volume 65 A significant amount of hardware was added to OMEGA to upgrade it to a 30-kJ, 60-beam laser. To control this hardware, an entirely new control system was implemented. This article describes one of the core subsystems of that control system— the Power Conditioning Executive.1 Timing and control of the electrical energy fed to OMEGA’s amplifiers are provided by the power ...

This paper is about a new dc-dc converter based on VOLTAGE MULTIPLIER CELL and MULTI STATE SWITCHING CELL. This method can be applied for all type of converters like BUK, BOOST,BUKBOOST,CUK,SEPIC &ZETA. To verify the operating principle BOOST converter is chosen. Experimental analysis is obtained from 1Kw lab prototype and the results are verified using simulation software. The output current a...