scispace - formally typeset
Search or ask a question
Author

Laurence Pujol

Bio: Laurence Pujol is an academic researcher from Radiall (France). The author has contributed to research in topics: Signal & Electronic circuit. The author has an hindex of 3, co-authored 7 publications receiving 12 citations.

Papers
More filters
Patent
20 May 2016
TL;DR: In this paper, the authors propose a module optoelectronique (M) for providing a conversion from an electrical signal from an electronic card to an optical signal propagated in free space or vice versa, comprising the following stack: an optical device (9) adapted to transmit a light signal through its upper surface, the optical device being attached directly on top of an electronic component of order and electrically connected to the electronic component; - a support (10) de dispositif optique, the support being fixed, preferably by gluing or soldering, directly on
Abstract: Module optoelectronique (M), destine a assurer une conversion d'un signal electrique depuis une carte electronique en un signal optique propage en espace libre ou vice-versa, comprenant l'empilement suivant: Optoelectronic module (M), for providing a conversion from an electrical signal from an electronic card to an optical signal propagated in free space or vice versa, comprising the following stack: - une carte electronique (1) destinee a servir d'interface avec une carte electronique d'application; - An electronic card (1) for interfacing with an application circuit board; - un composant electronique de commande (2) adapte pour realiser la commande d'un composant optoelectronique, le composant electronique etant fixe directement sur la carte electronique et relie electriquement au circuit electronique; - An electronic component controller (2) adapted for performing control of an optoelectronic component, the electronic component being fixed directly on the circuit board and electrically connected to the electronic circuit; - un composant optoelectronique (3) adapte pour emettre ou recevoir un signal lumineux par sa surface superieure, le composant optoelectronique etant fixe directement sur le dessus du composant electronique de commande et relie electriquement au composant electronique; - An optoelectronic component (3) adapted to emit or receive a light signal through its upper surface, the optoelectronic component being attached directly on top of the electronic component of order and electrically connected to the electronic component; - un dispositif optique (9) adapte pour transmettre un signal optique ; - An optical device (9) adapted to transmit an optical signal; - un support (10) de dispositif optique, le support etant fixe, de preference par collage ou brasage, directement sur la carte electronique de sorte a assurer l'alignement mecanique entre le dispositif optique et le composant optoelectronique. - A support (10) of the optical device, the support being fixed, preferably by gluing or soldering, directly on the electronic card so as to ensure the mechanical alignment between the optical device and the optoelectronic component.

4 citations

Proceedings ArticleDOI
12 Aug 2019
TL;DR: In this paper, a double-channel Michelson type interferometer is presented which allows absolute distance measurement up to 3 m with an uncertainty of 0.1 um, using the principle of synthetic wavelength and can be used under vacuum or in any gaseous medium.
Abstract: A double-channel Michelson type interferometer is presented which allows absolute distance measurement up to 3 m with an uncertainty of 0.1 um. It used the principle of synthetic wavelength and can be used under vacuum or in any gaseous medium with the help of a new type of source called an air-wavelength standard. The CNES is interested in an absolute measurement both in space vacuum and on the ground, in air to characterize optical instruments.

3 citations

Proceedings ArticleDOI
06 Oct 2017
TL;DR: In this paper, the authors developed a Free Space Optical Interconnect (FSOI) system for short range high speed data transfer, which is compliant with both a use in milaero environment and an operation up to 5 and 10 Gbps.
Abstract: To provide more flexibility in inter-board communication in blade chassis, we developed a Free Space Optical Interconnect (FSOI) system for short range high speed data transfer. We designed robust and low footprint components compliant with both a use in milaero environment and an operation up to 5 and 10 Gbps. The 5Gpbs configuration demonstrated large tolerance to misalignment between emitter and receiver modules: +1.5/-1 mm along optical axis, lateral tolerance of +/-1 mm and angular tolerances of +/-1.5°. Reliable performances have been demonstrated over a temperature range from -30°C to 80°C and constraint environment as thermal and damp heat cycles and vibrations. Increase the data rate of the FSO device one step beyond up to 10 Gbps requires dealing with mode partitioning troubles generated by the use of VCSEL lasers. We designed and evaluated an improved opto-mechanical combination to overcome this drawback. The resulting device shows error free 10 Gbps data transfer while keeping large tolerance to Tx/Rx misalignments.

3 citations

Proceedings ArticleDOI
09 Feb 2001
TL;DR: The reference laser of IASI is frequency locked onto a molecular reference absorption line providing a very stable frequency behavior over the several year duration of the instrument life as mentioned in this paper, which is well known for atomic clocks and has been adapted to the commercial availability of reliable telecommunication lasers.
Abstract: 12 IASI is a key instrument of the payload on METOP, a European meteorological platform METOP will provide meteorology with atmosphere emission spectra, allowing to set atmosphere temperature and moisture profiles with high accuracy In order to achieve these specifications, several new and innovative technologies and technical answers have had to be developed Among them, the reference laser of IASI presents challenging concepts and widely uses the last commercial developments of telecommunication technologies The reference laser is frequency locked onto a molecular reference absorption line providing a very stable frequency behavior over the several year duration of the instrument life The principle is well known for atomic clocks and has been adapted to the commercial availability of reliable telecommunication lasers Semiconductor laser modules, optical fibers and fibered components are used to achieve a compact and reliable subsystem The availability of such space compliant frequency stabilized laser sources opens new opportunities in the field of optical metrology such as interferometry and multi- aperture telescope co-phasing

3 citations

Patent
02 Jun 2016
TL;DR: In this article, an optoelectronic module, intended to provide a conversion of an electrical signal from an electronic board into an optical signal propagated in free space or vice versa, is described.
Abstract: An optoelectronic module, intended to provide a conversion of an electrical signal from an electronic board into an optical signal propagated in free space or vice versa, includes the following stack: an electronic board, intended to act as an interface with an electronic application board; an electronic control component suitable for controlling an optoelectronic component, the electronic component being attached directly onto the electronic board and electrically connected to the electronic circuit; an optoelectronic component suitable for transmitting or receiving a light signal via its upper surface, the optoelectronic component being attached directly on the top of the electronic control component and electrically connected to the electronic component; an optical device suitable for transmitting an optical signal; an optical device support, the support being attached, preferably by gluing or brazing, directly onto the electronic board so as to ensure the mechanical alignment between the optical device and the optoelectronic component.

1 citations


Cited by
More filters
Book ChapterDOI
TL;DR: The use of remote sensing instruments on orbiting satellite platforms in the study of Earth Science and environmental monitoring was officially inaugurated with the April 1, 1960 launch of the Television Infrared Observation Satellite (TIROS) as discussed by the authors.
Abstract: The use of remote sensing instruments on orbiting satellite platforms in the study of Earth Science and environmental monitoring was officially inaugurated with the April 1, 1960 launch of the Television Infrared Observation Satellite (TIROS) [1]. The first TIROS accommodated two television cameras and operated for only 78 days. However, the TIROS program, in providing in excess of 22,000 pictures of the Earth, achieved its primary goal of providing Earth images from a satellite platform to aid in identifying and monitoring meteorological processes. This marked the beginning of what is now over four decades of Earth observations from satellite platforms. reflected and emitted radiation from the Earth using instruments on satellite platforms. These measurements are input to climate models, and the model results are analyzed in an effort to detect short and long-term changes and trends in the Earth's climate and environment, to identify the cause of those changes, and to predict or influence future changes. Examples of short-term climate change events include the periodic appearance of the El Nino-Southern Oscillation (ENSO) in the tropical Pacific Ocean [2] and the spectacular eruption of Mount Pinatubo on the Philippine island of Luzon in 1991. Examples of long term climate change events, which are more subtle to detect, include the destruction of coral reefs, the disappearance of glaciers, and global warming. Climatic variability can be both large and small scale and can be caused by natural or anthropogenic processes. The periodic El Nino event is an example of a natural process which induces significant climatic variability over a wide range of the Earth. A classic example of a large scale anthropogenic influence on climate is the well-documented rapid increase of atmospheric carbon dioxide occurring since the beginning of the Industrial Revolution [3]. An example of the study of a small-scale anthropogenic influence in climate variability is the Atlanta Land-use Analysis Temperature and Air-quality (ATLANTA) project [4]. This project has found that the replacement of trees and vegetation with concrete and asphalt in Atlanta, Georgia, and its environs has created a microclimate capable of producing wind and thunderstorms. A key objective of climate research is to be able to distinguish the natural versus human roles in climate change and to clearly communicate those findings to those who shape and direct environmental policy.

31 citations

Journal ArticleDOI
TL;DR: A carrierless-amplitude-phase modulated and space-time coded free-space optical interconnect scheme to overcome limitations in bit rate and interconnection range and can be further scaled up to provide higher speed and further extended inter connection range.
Abstract: High-speed interconnects are highly demanded in data centers and high-performance computing, and the use of optical interconnects to replace electrical interconnects has been proposed and widely studied. For medium-range board-to-board communications, free-space based optical interconnects provide the additional advantage of reconfigurability and flexibility, compared with traditional waveguide or fiber-based counterparts. However, the bit rate and interconnection range in free-space optical interconnects are typically limited. In this paper, we propose a carrierless-amplitude-phase (CAP) modulated and space-time coded free-space optical interconnect scheme to overcome these limitations. Up to 80 Gb/s (2 × 40 Gb/s) interconnection with reconfigurability and flexibility is experimentally demonstrated for a maximum error-free distance exceeding 50 cm, showing about 65% improvement over previous demonstrations. The receiver sensitivity of the space-time coded system is measured as well, and results show that the space-time-block code (STBC) is capable of improving the receiver sensitivity and suppressing the inter-channel crosstalk. The impact of air turbulence, which exists in typical interconnect environments, is also experimentally investigated and results show that its impact on the proposed scheme is negligible. The proposed reconfigurable free-space optical interconnects with CAP and STBC can be further scaled up to provide higher speed and further extended interconnection range.

10 citations

Journal ArticleDOI
TL;DR: In this article , an elliptical-aperture multimode diversity receiver was proposed to mitigate the impairment from anisotropic turbulence, which was emulated by employing an electrically-controlled heater.
Abstract: We experimentally demonstrate an elliptical-aperture multimode diversity receiver to mitigate the impairment from anisotropic turbulence, which is emulated by employing an electrically-controlled heater. The anisotropy gradually decreases as the flow-level of the introduced airflow from fans increases. In contrast to circular-aperture reception, the elliptical-aperture multimode diversity receiver can effectively resist beam wander under anisotropic turbulence, reducing outage probability from 14.63% to 0.38% for detecting a dual-polarization 30-Gbaud QPSK signal. Without the aid of an adaptive optics system, this work demonstrates the feasibility of realizing an anisotropic-turbulence-resistant FSO link using multimode and multi-aperture diversity reception employing digital coherent combining techniques.

4 citations

Patent
06 Jul 2018
TL;DR: In this paper, a photoelectric module adopts the semiconductor laser as a light source, and can provide data transmission of more than 10 Gbp/s; during a transmission process, a WDM (Wavelength Division Multiplexing) technology is adopted to realize the signal transmission function integrating transmission and reception.
Abstract: The invention provides a method for wavelength division multiplexing optical communication of a high-speed free space. The method is characterized in that an optical module loads an electric signal tobe sent from the PCB on a light beam of a semiconductor laser and sending the electric signal to the free space; and meanwhile, after the optical module receives a laser beam loaded with the signal to be sent from the free space, the signal to be sent is recovered, so that an optical communication function integrating transmission and reception is realized. The photoelectric module adopts the semiconductor laser as a light source, and can provide data transmission of more than 10 Gbp/s; during a transmission process, a WDM (Wavelength Division Multiplexing) technology is adopted to realize the signal transmission function integrating transmission and reception. Data transmission between circuit boards of the data can be realized, and the method can be widely applied to the military, aerospace and industrial fields.

3 citations

Proceedings ArticleDOI
21 Nov 2017
TL;DR: In this article, the MOUSE II system development is presented, which has demonstrated the ability to obtain the required laser metrology using a frequency stabilised laser, a compact and totally passive Michelson type sensor head plus a detection unit for data processing.
Abstract: In the context of formation flying projects, one of the major points is the required precision on the intersatellites distance and/or relative displacement. According to the mission, these needs are more or less restrictive, leading to the use of fine laser metrology. Thus, for the needs of PEGASE mission – a possible DARWIN in flight demonstration- SAGEIS-CSO has been asked by CNES to design a fine longitudinal sensor able to work at 120 K while performing displacement measurements at a working distance range of 25 to 250 m. Its required performances are a resolution and a precision of 25 nm. This activity succeeds to the MOUSE II system development, which has demonstrated the ability to obtain the required laser metrology using a frequency stabilised laser, a compact and totally passive Michelson type sensor head plus a detection unit for data processing. Optical signals are routed using fibres, allowing the sensor head to be alone in a cryogenic environment. Now, the goal is to obtain a validated prototype at a MQ level by the end of 2007. For that, the laser source will be an update of the flight models made for IASI, using a more powerful DFB diode, pin-to-pin compatible with the previous design, and then giving minor changes. The current regulation was optimized in order not to degrade the narrow diode spectral width. The opto-thermo-mechanical design of the sensor head, in collaboration with AAS, is also under progress, and constitutes the major evolution of the MOUSE II.

2 citations