Institution
Alcatel-Lucent
Stuttgart, Germany•
About: Alcatel-Lucent is a based out in Stuttgart, Germany. It is known for research contribution in the topics: Signal & Network packet. The organization has 37003 authors who have published 53332 publications receiving 1430547 citations. The organization is also known as: Alcatel-Lucent S.A. & Alcatel.
Papers published on a yearly basis
Papers
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01 Jan 1999TL;DR: The voltage controlled oscillator (VCO) is a critical sub-block in communications transceivers and the performance of VCOs in different implementation styles is compared to evaluate when and if VCO integration is desirable.
Abstract: The voltage controlled oscillator (VCO) is a critical sub-block in communications transceivers. The role of the VCO in a transceiver and the VCO requirements are first reviewed. The necessity of GHz VCOs and the driving factors towards the monolithic integration of the VCO are examined. VCO design techniques are outlined and design trade-offs are explored. The performance of VCOs in different implementation styles is compared to evaluate when and if VCO integration is desirable.
215 citations
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TL;DR: High electron and hole mobilities as well as balanced charge carrier injection lead to improved exciton generation in these gate-controlled devices and the effect of charge-induced absorption is substantially reduced in high-quality single crystals compared with amorphous organic materials.
Abstract: We report on electrically driven amplified spontaneous emission and lasing in tetracene single crystals using field-effect electrodes for efficient electron and hole injection. For laser action, feedback is provided by reflections at the cleaved edges of the crystal resulting in a Fabry-Perot resonator. Increasing the injected current density above a certain threshold value results in the decreasing of the spectral width of the emission from 120 millielectron volts to less than 1 millielectron volt because of gain narrowing and eventually laser action. High electron and hole mobilities as well as balanced charge carrier injection lead to improved exciton generation in these gate-controlled devices. Moreover, the effect of charge-induced absorption is substantially reduced in high-quality single crystals compared with amorphous organic materials.
214 citations
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25 Jun 2000TL;DR: This work attempts to quantify improvement in spectral efficiency of mobile radio networks by introducing the multiple-access relay channel (MARC) and deriving capacity results for it.
Abstract: The spectral efficiency of mobile radio networks can be improved by allowing each mobile station to act as a relay for one other mobile station. One can expect further performance improvement if each relay aids not just a single mobile station, but many simultaneously. We attempt to quantify this improvement by introducing the multiple-access relay channel (MARC) and deriving capacity results for it. Capacity outer and inner bounds for it are derived.
214 citations
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TL;DR: In this paper, the twofold polarization degeneracy of etched air-post vertical-cavity surface emitting laser diodes can be lifted and a dominant polarization state selected through use of anisotropic transverse laser cavity geometries.
Abstract: We show the two-fold polarization degeneracy of etched air-post vertical-cavity surface emitting laser diodes can be lifted and a dominant polarization state selected through use of anisotropic transverse laser cavity geometries. For lasers with rhombus-shaped cavities, fundamental mode lasing emission linearly polarized along one specified crystal axis is obtained up to twice the threshold current. For dumbbell-shaped lasers, fundamental mode lasing emission linearly polarized along one specified crystal axis is maintained over the entire operating range of the device producing a maximum orthogonal polarization suppression ratio of 14 dB. >
214 citations
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02 Jul 1999TL;DR: In this article, a rectifier consisting of switching circuitry coupled between the input and the output, the switching circuitry adapted to operate in selected one of (a) an active bidirectional mode of operation and (b) an inactive unidirectionalmode of operation to rectify substantially alternating current at the input to produce substantially direct current at output and control circuitry coupled with the rectifier output and a control input of the switch circuitry, the control circuitry capable of sensing an output current level of the rectifiers and transitioning the switching circuit between the active biddirectional mode and the
Abstract: A rectifier having an input and an output and a method of controlling the rectifier. The rectifier comprises: (1) switching circuitry coupled between the input and the output, the switching circuitry adapted to operate in selected one of (a) an active bidirectional mode of operation and (b) an inactive unidirectional mode of operation to rectify substantially alternating current at the input to produce substantially direct current at the output and (2) control circuitry coupled between the rectifier output and a control input of the switching circuitry, the control circuitry capable of sensing an output current level of the rectifier and transitioning the switching circuitry between the active bidirectional mode and the inactive unidirectional mode as a function of the output current level thereby to prevent substantial reverse power flow through the rectifier. The rectifier is particularly useful in power systems having a plurality of rectifiers operating in parallel to prevent one rectifier from driving the other.
214 citations
Authors
Showing all 37011 results
Name | H-index | Papers | Citations |
---|---|---|---|
George M. Whitesides | 240 | 1739 | 269833 |
Yoshua Bengio | 202 | 1033 | 420313 |
John A. Rogers | 177 | 1341 | 127390 |
Zhenan Bao | 169 | 865 | 106571 |
Thomas S. Huang | 146 | 1299 | 101564 |
Federico Capasso | 134 | 1189 | 76957 |
Robert S. Brown | 130 | 1243 | 65822 |
Christos Faloutsos | 127 | 789 | 77746 |
Robert J. Cava | 125 | 1042 | 71819 |
Ramamoorthy Ramesh | 122 | 649 | 67418 |
Yann LeCun | 121 | 369 | 171211 |
Kamil Ugurbil | 120 | 536 | 59053 |
Don Towsley | 119 | 883 | 56671 |
Steven P. DenBaars | 118 | 1366 | 60343 |
Robert E. Tarjan | 114 | 400 | 67305 |