The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Philippe Basset - One of the best experts on this subject based on the ideXlab platform.
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series parallel charge pump conditioning circuits for electrostatic kinetic energy harvesting
IEEE Transactions on Circuits and Systems I-regular Papers, 2017Co-Authors: Armine Karami, Dimitri Galayko, Philippe BassetAbstract:This paper presents a new family of conditioning circuits used in electrostatic kinetic energy harvesters (e-KEHs), generalizing a previously reported conditioning circuit known as the Bennet's doubler. The proposed topology implements a conditioning scheme described by a rectangular charge-voltage cycle (QV-cycle) of tunable aspect ratio. These circuits show an exponential increase of the converted energy over operation time if studied in the sole Electrical Domain. The QV-cycle's aspect ratio can be set to values that were previously inaccessible with other exponential conditioning circuits. After a brief intuitive presentation of the new topology, its operation is rigorously analyzed and its dynamics are quantitatively derived in the Electrical Domain. In particular, the aspect ratio of the rectangular QV-cycle describing the biasing scheme of the transducer is expressed as a function of the circuit's parameters. Practical considerations about the use of the reported conditioning circuits in actual e-KEHs are also presented. These include a discussion on the applications of the proposed conditioning, a description of the effects of Electrical nonidealities, and a proposition of an energy extracting interface.
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capacitive energy conversion with circuits implementing a rectangular charge voltage cycle part 1 analysis of the Electrical Domain
IEEE Transactions on Circuits and Systems I-regular Papers, 2015Co-Authors: Dimitri Galayko, Andrii Dudka, Armine Karami, Eoghan Oriordan, Elena Blokhina, Orla Feely, Philippe BassetAbstract:Capacitive kinetic energy harvesters (KEH) employ conditioning circuits which achieve a dynamic biasing of the transducer's variable capacitor. This paper, composed of two articles Part 1 and Part 2, proposes a unified theory describing Electrical and electromechanical properties of an important and wide class of conditioning circuits: those implementing a rectangular charge-voltage cycle. The article Part 1 introduces a basic configuration of conditioning circuit implementing an ideal rectangular QV cycle, and discusses its known practical implementations: the Roundy charge pump with different flyback mechanisms, and configurations based on the Bennet's doubler. In Part 1, the analysis is done in the Electrical Domain, without accounting for electromechanical coupling, while in Part 2, the full electromechanical system is analyzed. An optimization approach common to all configurations is proposed. A comparison is made between different topologies and operation modes, based on the maximal energy converted in one cycle under similar Electrical and mechanical conditions. The last section discusses practical implementation of circuits with smart and adaptive behavior, and presents experimental results obtained with state-of-the art MEMS capacitive KEH devices.
David E Dodds - One of the best experts on this subject based on the ideXlab platform.
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optical single sideband transmission at 10 gb s using only Electrical dispersion compensation
Journal of Lightwave Technology, 1999Co-Authors: M Sieben, J Conradi, David E DoddsAbstract:A system is presented which uses optical single sideband transmission at 10 Gb/s together with Electrical dispersion compensation at the receiver. Transmission with a bit error rate better than 10/sup -10/ on nondispersion shifted fiber is experimentally demonstrated over 320 km and the dispersion from 1000 km of fiber was effectively equalized in simulation. In the transmitter, driving one or two modulators with a combination of a baseband digital signal and the Hilbert transform of that signal creates an optical single sideband signal. In terms of reducing the effects of chromatic dispersion, transmitting the signal in a single sideband format has two advantages over a double sideband format. First, the optical bandwidth of the transmitted single sideband signal is approximately one half of a conventional double sideband signal. Second, an optical single sideband signal with transmitted carrier can be "self-homodyne" detected and the majority of the phase information preserved since no spectrum back folding occurs upon detection. This allows the received signal to be partially equalized in the Electrical Domain.
Thomas Schneider - One of the best experts on this subject based on the ideXlab platform.
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integrated source free all optical sampling with a sampling rate of up to three times the rf bandwidth of silicon photonic mzm
Optics Express, 2019Co-Authors: Arijit Misra, Christian Kress, Karanveer Singh, Stefan Preusler, Christoph J Scheytt, Thomas SchneiderAbstract:Source-free all optical sampling, based on the convolution of the signal spectrum with a frequency comb in an electronic-photonic, co-integrated silicon device will be presented for the first time, to the best of our knowledge. The method has the potential to achieve very high precision, requires only low power and can be fully tunable in the Electrical Domain. Sampling rates of three and four times the RF bandwidths of the photonics and electronics can be achieved. Thus, the presented method might lead to low-footprint, fully-integrated, precise, Electrically tunable, photonic ADCs with very high-analog bandwidths for the digital infrastructure of tomorrow.
Eli Yablonovitch - One of the best experts on this subject based on the ideXlab platform.
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maximizing spectral utilization in wdm systems by microwave Domain filtering of tandem single sidebands
IEEE Transactions on Microwave Theory and Techniques, 2001Co-Authors: A Narasimha, Xuejun Meng, Cedric F Lam, Eli YablonovitchAbstract:We present an optical tandem single-sideband receiver that enables the detection of signals having different information in the two sidebands of the same optical carrier. The technique relies on the use of a dual-electrode Mach-Zehnder modulator and achieves heterodyne detection without the use of an optical local oscillator. Sharp filtering requirements are met in the Electrical Domain, eliminating the need for wasteful guardbands.
Sonia Galech - One of the best experts on this subject based on the ideXlab platform.
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characterization of stimulated brillouin scattering spectra by use of optical single sideband modulation
Optics Letters, 2004Co-Authors: Alayn Loayssa, Ruben Hernandez, D Benito, Sonia GalechAbstract:We introduce an enhanced method for the characterization of stimulated Brillouin scattering (SBS) spectra in single-mode fiber that is based on optical single-sideband modulation. This novel technique is shown to provide high-resolution characterization of SBS even under saturation operation in a simple and stable setup in which the spectrum is translated from the optical to the Electrical Domain, sweeping the frequency of an Electrical signal generator. Experimental results are used to demonstrate the performance of the system in measuring the detailed structure of acoustic modes in three types of single-mode fiber.