Abstract A new scheme of optical pulse generation using multiple optoelectronic phase locked loops is proposed. The principle of the scheme is combining three or more coherent optical waves having equal frequency separation. The coherencies of the optical waves are attained by the use of optoelectronic phase locked loops. The repetition frequency of the generated optical pulse is equal to the f...

Tetrahedral amorphous carbon (ta-C) films were studied with and without applying fixed pulse bias and frequency at variable pulse widths in double bent Filtered Cathodic Vacuum Arc(FCVA) system. Both from Raman and X-ray photoelectron spectroscopy(XPS) analyses it has been observed that the ratio of sp/sp is maximal at pulse width of 15 μs with fixed pulse bias 3kV and frequency 200 kHz. Increa...

Pulse Width Modulated (PWM) voltage source inverters (VSIs) are extensively used in industrial and domestic applications. The versatile natural sampled sinusoidal PWM (SPWM) method can perform output voltage control with acceptable indices. In these PWM-VSI, the coarse voltage regulation is done with change in modulation depth while fine voltage regulations have not been addressed by other auth...

We report a single-frequency linearly-polarized nanosecond fiber ring-cavity laser based on an electro-optic modulator. A 0.08-nm-bandwidth Bragg grating combined with section of 1-m unpumped Yb-doped act as ultra-narrow bandwidth filter to realize output. The devices used in the experiments are all polarization-maintaining ensure Pulsed is obtained by using modulator adjust loss cavity periodi...

A software defined radio (SDR) terminal promotes programmable realizations of the physical layer functionalities. A lot of research work has been done in applying digital signal processors (DSP) and field programmable gate arrays (FPGA) to implement the baseband functionalities of the physical layer. In this paper, the programmable solutions are extended to the radio frequency (RF) band for the...

A new klystron based X-band rf power source operating at 11.994 GHz has been installed and started to be commissioned at CERN in collaboration with CEA Saclay and SLAC for CLIC accelerating structure tests. The system comprises a solid state high voltage modulator, an XL5 klystron developed by SLAC, a cavity based SLED type pulse compressor, the necessary low level rf system including rf diagno...

This paper describes the trigger control and fault reaction circuitry for the new solid-state switch modulator at the MIT Bates Linear Accelerator Center. This new circuitry has been designed and built to control the new cathodeswitching solid-state modulator that replaces the old vacuum-tube technology modulator. The old modulator used a start signal to commence its pulses and a separate stop ...