Zeno Toffano

Zeno Toffano
CentraleSupelec - ParisSaclay Universtity · Signal Information Communication - Laboratoire des Signaux et Systèmes CNRS

PhD + Habilitation

About

92
Publications
15,147
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613
Citations
Additional affiliations
October 2002 - January 2014
École Supérieure d'Electricité
Position
  • Professor (Full)
Description
  • Quantum Physics
November 2001 - January 2013
École Supérieure d'Electricité
Position
  • Professor (Full)
Description
  • Optoelectronics and Fiber Optics Càommunications
January 1987 - May 2015
École Supérieure d'Electricité
Position
  • Professor (Full)

Publications

Publications (92)
Article
Full-text available
The paper presents quantum model of subjective text perception based on binary cognitive distinctions corresponding to words of natural language. The result of perception is quantum cognitive state represented by vector in the qubit Hilbert space. Complex-valued structure of the quantum state space extends the standard vector-based approach to sema...
Conference Paper
Full-text available
A small contribution on a matter raised by R.Penrose and W.Rindler, best explained by quoting from their book Spinors & Space-Time, Volume 2, Chapter 6 (Twistors), Paragraph 6.1 (The twistor equation and its solution in space): "Indeed the four-dimensionality and (+ - - -) signature of space-time, together with the desirable global properties of or...
Article
Full-text available
This work presents an operational and geometric approach to logic. It starts from the multilinear elective decomposition of boolean functions in the original form introduced by George Boole. It is then shown that this algebraic polynomial formulation can be naturally extended to operators in finite vector spaces. Logical operators will appear as co...
Article
Full-text available
Considering links between logic and physics is important because of the fast development of quantum information technologies in our everyday life. This paper discusses a new method in logic inspired from quantum theory using operators, named Eigenlogic. It expresses logical propositions using linear algebra. Logical functions are represented by ope...
Chapter
The behavior of agents represented by Braitenberg vehicles is investigated in the context of the quantum robot paradigm. The agents are processed through quantum circuits with fuzzy inputs, this permits to enlarge the behavioral possibilities and the associated decisions for these simple vehicles. The logical formulation Eigenlogic, using quantum l...
Article
Purpose The purpose of this paper is to apply the quantum “eigenlogic” formulation to behavioural analysis. Agents, represented by Braitenberg vehicles, are investigated in the context of the quantum robot paradigm. The agents are processed through quantum logical gates with fuzzy and multivalued inputs; this permits to enlarge the behavioural pos...
Article
Full-text available
This paper aims to apply the notions of quantum geometry and correlation to the typification of semantic relations between couples of keywords in different documents. In particular we analysed texts classified as hate / non hate speeches, containing the keywords "women", "white", and "black". The paper compares this approach to cosine similarity, a...
Conference Paper
Full-text available
This work presents an operational and geometric approach to logic. It starts from the multilinear elective decomposition of binary logical functions in the original form introduced by George Boole [1]. A justification on historical grounds is presented bridging Boole's theory and the use of his arithmetical logical functions with the axioms of Bool...
Article
Purpose The paper aims to provide a semiotic interpretation of the role played by entanglement in quantum-based models aimed to information retrieval and suggests possible improvements. Actual models are capable of retrieving documents relevant to a query composed of a keyword and its acceptation expressed by a given context. The paper also consid...
Article
Full-text available
A method for synthesizing quantum gates is presented based on interpolation methods applied to operators in Hilbert space. Starting from the diagonal forms of specific generating seed operators with non-degenerate eigenvalue spectrum one obtains for arity-one a complete family of logical operators corresponding to all the one-argument logical conne...
Article
Full-text available
Abstract : Recently, the methods of quantum theory, especially quantum information, started to be widely applied outside of physics: in cognitive, social sciences, economics, finance, decision making and biology. We propose a quantum-like model: the “information laser”. The basic assumption is the discrete structure of state spaces related to the q...
Article
Full-text available
This work proposes a formulation of propositional logic, named Eigenlogic, using quantum observables as propositions. The eigenvalues of these operators are the truth-values and the associated eigenvectors the interpretations of the propositional system. Fuzzy logic arises naturally when considering vectors outside the eigensystem, the fuzzy member...
Article
Full-text available
A method for synthesizing quantum gates is presented based on interpolation methods applied to operators in Hilbert space. Starting from the diagonal forms of specific generating seed operators with non-degenerate eigenvalue spectrum one obtains for arity-one a family of logical operators corresponding to the one-argument logical connectives. Scali...
Conference Paper
We propose a matrix model for two- and many-valued logic using families of observables in Hilbert space, the eigenvalues give the truth values of logical propositions where the atomic input proposition cases are represented by the respective eigenvectors. For binary logic using the truth values \(\{0,1\}\) logical observables are pairwise commuting...
Article
Full-text available
We propose a matrix model for two- and many-valued logic using families of observables in Hilbert space, the eigenvalues give the truth values of logical propositions where the atomic input proposition cases are represented by the respective eigenvectors. For binary logic using the truth values {0,1} logical observables are pairwise commuting proje...
Conference Paper
Full-text available
Entangled Bell states have been represented in quantum computation by a CNOT gate whose control Qbit is in an undetermined state. This basic circuit can be useful to represent semantic relationships between two words (lexemes) in a text. Entangled states have been used to detect semantic relationships in Information Retrieval (IR). A lexeme can be...
Article
Full-text available
We are interested in the concept of quantum entanglement, starting from the history and postulates of Quantum Physics. The debate on entanglement is then introduced through the EPR argument and Bell's theorem and the first experiments showing entanglement are discussed. Technological applications of quantum entanglement are described: quantum telep...
Article
Full-text available
We investigate different combinations of Pauli Operators X, Y and Z in a 4 dimensional Hilbert space. Our approach is inspired by the stabilizer formalism using tensor products of Pauli Operators (including also the identity operator I) which is a powerful and well known method for understanding a wide class of operations in quantum mechanics. Asso...
Conference Paper
Full-text available
Bell theorem in the form of the CHSH inequality[1] can test the possibility of a local hidden variable theory. Violation of the Bell Inequality in quantum mechanics is a sign of entanglement and the maximum violation is given by the Tsirelson bound 2*sqrt(2). In a four dimensional Hilbert space along with four operators commuting in pairs, a Bell o...
Conference Paper
Full-text available
Tests are essential in Information Retrieval and Data Mining in order to evaluate the effectiveness of a query. An automatic measure tool intended to exhibit the meaning of words in context has been developed and linked with Quantum Theory, particularly entanglement. "Quantum like" experiments were undertaken on semantic space based on the Hyperspa...
Article
Full-text available
Isotropic broadband probes or spectrum analyzers (SAs) may be used for the measurement of rapidly varying electromagnetic fields generated by emerging wireless communication systems. In this paper this problematic is investigated by comparing the responses measured by two different isotropic broadband probes typically used to perform electric field...
Conference Paper
We present the design, realization and test of a high bit-rate optical communication system dedicated to underwater operations at the bottom of the sea transmitting data between sensor hubs and remote operated vehicles.
Article
Full-text available
Tests are essential in Information Retrieval (IR), in order to evaluate the effectiveness of a query. Tests intended to exhibit the sense of words in con-text were undertaken and linked with Quantum Mechanics (QM). Poll tests were undertaken on heterogeneous media such as music and polysemy in foreign languages. Interference effects are shown in th...
Conference Paper
In the context of human exposure to Radio Frequency (RF), measurements of electromagnetic fields are performed, according to standard measurement protocols, using isotropic broadband probes with or without service filters. Two electric field measurement probes are herein examined. Their responses to different typical WIMAX emissions are analysed. R...
Article
Full-text available
RÉSUMÉ Nous présentons les résultats expérimentaux d'une liaison Radio OFDM faible coût sur fibre optique standard G.652 avec une source VCSEL commercialement disponible à la longueur d'onde de 850 nm et propagation sur les deux premiers modes LP de la fibre optique. Les signaux transmis sont de type WIMAX (Worldwide Interoperability for Microwave...
Conference Paper
Full-text available
We present a new experimental BER extraction method using a sampling oscilloscope and statistical processing on EDFA noise, photoreceiver noise, jitter and ISI successfully tested on a 40 Gb/s network.
Article
Full-text available
RESUME Nous proposons une méthode innovante de mesure du taux d'erreur binaire utilisant un oscilloscope en temps équivalent et un traitement statistique approprié. Cette méthode est capable d'extraire le taux d'erreur binaire de liaison optiques en tenant compte du bruit ASE des amplificateurs optiques, du bruit du photorécepteur, de la gigue de p...
Article
Linewidth is measured over the threshold transition of a vertical-cavity surface-emitting laser and results are compared to a Fokker-Planck semiconductor laser model. The linewidth shows nonmonotonous behavior at threshold similar to that previously observed in distributed feedback lasers. The behavior agrees with the Fokker-Planck model if the lin...
Article
A complete model of the spatiotemporal behavior of multimode vertical-cavity surface-emitting lasers (VCSELs), through static and dynamic response, noise, thermal effects, and its coupling to multimode fibers (MMF) has been investigated in low-cost 10-Gb Ethernet (10-Gb E) prototype optoelectronic packages using GaAs VCSEL arrays coupled to MMF rib...
Article
Full-text available
A corollary to an experimental proposal made by Anton Zeilinger - the famous double-double slit experiment - is suggested to be possible. The double Mach-Zehnder experiment.
Article
Very short range (VSR) high bit rate optical fiber communications are an emerging market dedicated to local area networks, digital displays or board to board interconnects within real time calculators. In this technology, a very fast way to exchange data with high noise immunity and low-cost is needed. Optical multimode graded index fibers are used...
Article
High-speed Optoelectronic Modules using Vertical Cavity Surface Emitting Lasers (VCSEL) coupled to Multi Mode Fibers (MMF) are a performing and low-cost solution for 10 Gigabit Ethernet (10 GbE) in short-distance optical links. A complete model of the spatiotemporal behavior of multimode VCSELs, through static and dynamic response, noise, thermal e...
Article
Full-text available
RÉSUMÉ Les transmissions DWDM sur fibres optiques (Dense Wavelength Division Multiplexing) utilisent plusieurs sources optiques de longueurs d'onde différentes superposées dans une même fibre optique. Chaque source (souvent une diode laser DFB ou parfois une diode laser DBR accordable) transmet un flux de données numériques différent. Nous proposon...
Article
Full-text available
Nous présentons ici un modèle permettant de décrire le comportement d’une population de solitons photoréfractifs présentant un assez grand nombre d’interactions entre eux et introduisant un désordre que nous pensons être un chaos. Ce modèle évolutif permet de mettre en évidence les paramètres qui engendrent le chaos. Nous présentons aussi une métho...
Conference Paper
In the framework of the RMNT SHAMAN research project, models for optoelectronic MOEMS for short range communications are proposed. These models use system parameters available from manufacturers allowing a more reliable simulation using components from different manufacturers and interoperability. Prototype modules, including VCSELs without thermal...
Article
Full-text available
Dense wavelength division multiplexing optical networks use tunable devices such as distributed Bragg reflector laser diodes. These optical sources require a precise wavelength calibration according to the ITU grid, even with aged components. Some specific optical spectrum analyzers are commercially available. Unfortunately, measurements using thos...
Article
Tunable laser diodes are now widely used in dense wavelength division multiplexing (DWDM) optical fiber networks. A wide tunability range and good frequency stability are generally required, without mode hopping. Special applications require fast frequency measurement. Unfortunately, commercially available classical spectral measurement systems are...
Article
Full-text available
Tunable laser diodes are now widely used in dense wavelength division multiplexing (DWDM) optical fiber networks. A wide tunability range and good frequency stability are generally required, without mode hopping. Special applications require fast frequency measurement. Unfortunately, commercially available classical spectral measurement systems are...
Article
Full-text available
The integration of different components in optoelectronics modules, such as VCSEL and photodiode arrays, optical guides and electronics, introduces optoelectronical, thermal and mechanical interactions. In this context, a thermal and optoelectronic model of VCSEL array is proposed. The self and cross heating of VCSEL arrays have been simulated. The...
Article
Full-text available
The assembly within a single optoelectronic interconnect module of different components, including vertical-cavity semiconductor lasers and photodiode arrays, optical fibers, and electronics implying electrical, optical, mechanical, and thermal interactions, introduces new constraints in the conception phase and necessitates a new and different app...
Article
More and more complex modules integrate electronics, optoelectronical components, optical components within a single system. This points out a need for suitable computer aided design (CAD) tools, able to simulate constraints due to different domains (electronics, optics, thermics, mechanics), together with their interactions. The SHAMAN project is...
Book
Optoélectronique Composants et fibres optiques Chapitre I - Optique ondulatoire électromagnétique 11 1 - Spectre électromagnétique 11 2 - Formes d'ondes optiques 13 3 - Transformées optiques 25 4 - Polarisation de la lumière 32 5 - Puissance et énergie électromagnétique 34 6 - Réflexion et réfraction 37 7 - Effets optiques non linéaires 42 Exercic...
Book
Full-text available
Ce cours profitera également à tous les étudiants, ingénieurs et chercheurs concernés ou intéressés par le développement de l'optoélectronique. Il expose notamment : le traitement électromagnétique des différentes formes d'ondes lumineuses, les fonctions optiques de base intervenant dans les composants optoélectroniques, comme le filtrage interfére...
Article
Full-text available
RÉSUMÉ Le comportement de modules optoélectroniques rapides utilisant des lasers VCSEL 850 nm pour des applications courte distance et haut débit (jusqu'à 10 Gb/s) avec des fibres multimodes a été modélisé, montrant l'influence de la structure des modes spatiaux et des interactions thermiques sur la bande passante et sur le diagramme de l'oeil en f...
Article
Analytical formulas for distortions permitting the calculation of composite second order (CSO) and composite triple beat (CTB) in distributed feedback (DFB) laser diodes are given, including gain compression and longitudinal spatial hole burning (LSHB). An improved chirp expression including both effects is also proposed. Gain compression is compar...
Article
Semiconductor laser threshold transition is investigated by high precision power and linewidth measurements giving specific behavior of linewidth at threshold depending on linewidth enhancement α factor. An analytical model based on Fokker-Planck equation resolution is proposed for extraction of major laser parameters by fitting simultaneously belo...
Conference Paper
Stationary temperature distributions in the three-electrode DBR lasers are calculated analytically using Fourier transforms. It is theoretically shown that if the lasing mode is biased at the long wavelength side of the Bragg reflection peak, a significant increase in 3 dB modulation bandwidth and decrease in spectral linewidth can be obtained
Conference Paper
Static and dynamic thermal processes are incorporated into the modelling and simulation of the three-electrode distributed Bragg reflector (DBR) lasers. An analysis of thermal contribution to bandwidth increase and linewidth decrease in multielectrode DBR lasers is presented. It is theoretically shown that the position of the lasing mode relative t...
Conference Paper
A new distributed Bragg reflector (DBR) laser with continuously and arbitrarily chirped gratings is theoretically analysed. The chirped gratings are defined by bent waveguides on homogeneous grating fields. The influence of the chirped gratings on tunability of multielectrode DBR lasers is presented via the study of different bending functions. It...
Article
Full-text available
The relativistic dynamics of an electron subjected to the classical electromagnetic field of an ultrashort laser pulse is studied theoretically at arbitrary intensities. Frequency modulation effects associated with the nonlinear relativistic Doppler shift induced on the backscattered radiation are analyzed in detail. For circular polarization, an e...
Conference Paper
Semiconductor laser threshold is characterised by output power and linewidth measurements. An analytical fitting model extracts precisely: spontaneous emission, photon lifetime, carrier recombination rates, differential gain and linewidth enhancement factor. Surface-emitting lasers and resonant semiconductor optical amplifiers can be characterised...
Conference Paper
Recently, a new method to generate chirped DFB gratings by bent waveguides for increasing tunability of DBR lasers was proposed. Here we apply “Chirped DBR gratings” to improve and tailor specific properties. Our method to generate chirped DBR gratings is based on bent waveguides superimposed on homogeneous DBR grating fields. The method provides c...
Article
Measurements, on CATV DFB strained QW lasers, of first-order, second-order optical modulation depth (OMD) and, for the first time, of DC component decrease with modulation Δ<sub>DC</sub> are fitted within a nonlinear model giving a precise determination of gain compression factor ε. This direct determination method at intermediate modulation freque...
Article
In this paper, we present a full analysis of noise in semiconductor lasers. Time-covariance and cross-covariance functions of all variables governing single-mode semiconductor laser behavior are given including all Langevin noise sources and considering all terms of the laser rate equations, RIN, carrier noise spectrum, frequency noise spectrum, co...
Article
Full-text available
A detailed experimental and theoretical investigation on the evolution of linewidth Av(I) function of injection current for different structures of semiconductor lasers has been undertaken. Linewidth shows a continuous transition and tends asymptotically on either side to Schawlow-Townes inverse power behaviours. In a small current zone at threshol...
Article
An analytical model based on Volterra nonlinear functionals applied to semiconductor lasers has been developed. Analytical expressions are obtained for different laser diode responses, giving powerful tools for analysis. For harmonic input, the response is given including the gain compression factor ε. Second-harmonic distortion (2HD) shows two max...
Article
Precision optical spectral lineshape measurements on semiconductor lasers using Michelson and Fabry-Perot interferometers are presented. Measurements ranging from 30 MHz up to 100 GHz give the spectral behavior above and below threshold even for very small emitted optical powers. Variations of the linewidth above and below threshold as a function o...
Article
Linewidth measurements of singlemode and multimode InGaAsP lasers were made above and below threshold with adapted interferometers. Linewidth against inverse power plots Delta nu =f(1/P), show different Schawlow-Townes slopes above and below threshold. Differences have been observed depending on singlemode or multimode laser behaviour. In the singl...
Conference Paper
Infrared communication technology has several advantages: simplicity, low cost , a wide range of applications, simple integration to the present car devices. Besides this, the infrared frequency range is not occupied yet and is a technology that can repeat itself at multiple locations. The main contribution of DACAR experiments to the field of infr...
Conference Paper
The relativistic transform of electromagnetic fields and inductions in a nonlinear medium is studied theoretically, within the framework of classical electrodynamics. A covariant formulation of the electrodynamics of nonlinear media is presented. This theoretical formulation is of particular relevance to periodic systems since the spatial symmetrie...
Article
Full-text available
The relativistic transform of electromagnetic fields and inductions in a nonlinear medium is studied theoretically, within the framework of classical electrodynamics. A covariant formulation of the electrodynamics of nonlinear media is presented. This theoretical formulation is of particular relevance to periodic systems since the spatial symmetrie...
Conference Paper
Full-text available
Résumé Nous avons calculé, étudié et réalisé des configurations simples à base de fibres monomodes, basées sur le principe des boucles de Lefèvre, afin d'obtenir différents états de polarisation (rectiligne, circulaire ou elliptique). L'étude à l'aide d'analyseurs adaptés à l'infrarouge nous permet d'évaluer la birefringence induite en fonction de...