Showing papers by "Guy Millot published in 2012"
TL;DR: Novel experiments in optical fibre are reported that confirm the KM soliton theory and show that KM dynamics appear more universally than for the specific conditions originally considered, and can be interpreted as an analytic description of Fermi-Pasta-Ulam recurrence in NLSE propagation.
Abstract: The nonlinear Schrodinger equation (NLSE) is a central model of nonlinear science, applying to hydrodynamics, plasma physics, molecular biology and optics. The NLSE admits only few elementary analytic solutions, but one in particular describing a localized soliton on a finite background is of intense current interest in the context of understanding the physics of extreme waves. However, although the first solution of this type was the Kuznetzov-Ma (KM) soliton derived in 1977, there have in fact been no quantitative experiments confirming its validity. We report here novel experiments in optical fibre that confirm the KM soliton theory, completing an important series of experiments that have now observed a complete family of soliton on background solutions to the NLSE. Our results also show that KM dynamics appear more universally than for the specific conditions originally considered, and can be interpreted as an analytic description of Fermi-Pasta-Ulam recurrence in NLSE propagation.
346 citations
TL;DR: The unexpected capability of light to self-organize its own state-of-polarization, upon propagation in optical fibers, into universal and environmentally robust states, namely right and left circular polarizations is demonstrated.
Abstract: Wherever the polarization properties of a light beam are of concern, polarizers and polarizing beamsplitters (PBS) are indispensable devices in linear-, nonlinear- and quantum-optical schemes. By the very nature of their operation principle, transformation of incoming unpolarized or partially polarized beams through these devices introduces large intensity variations in the fully polarized outcoming beam(s). Such intensity fluctuations are often detrimental, particularly when light is post-processed by nonlinear crystals or other polarization-sensitive optic elements. Here we demonstrate the unexpected capability of light to self-organize its own state-of-polarization, upon propagation in optical fibers, into universal and environmentally robust states, namely right and left circular polarizations. We experimentally validate a novel polarizing device - the Omnipolarizer, which is understood as a nonlinear dual-mode polarizing optical element capable of operating in two modes - as a digital PBS and as an ideal polarizer. Switching between the two modes of operation requires changing beam's intensity.
57 citations
TL;DR: In this article, a 5-km-long Raman fiber laser that delivers pulses at high harmonics of the fundamental cavity repetition rate, up to 1 GHz, is presented.
Abstract: We present a 5-km-long Raman fiber laser that delivers pulses at high harmonics of the fundamental cavity repetition rate, up to 1 GHz. The observed nanosecond pulses that propagate in an anomalous dispersion regime possess a complex noise-like structure with a coherence time of around 1 picosecond.
48 citations
TL;DR: It is concluded that the optical supercontinuum provides a highly versatile means of studying and generating a wide class of random processes at optical wavelengths.
Abstract: We report a numerical study showing how the random intensity and phase fluctuations across the bandwidth of a broadband optical super-continuum can be interpreted in terms of the random processes of random walks and Levy flights. We also describe how the intensity fluctuations can be applied to physical random number generation. We conclude that the optical supercontinuum provides a highly versatile means of studying and generating a wide class of random processes at optical wavelengths.
19 citations
TL;DR: In this article, the shaping and stability of optical continua in the long pulse regime were discussed. And the Peregrine soliton was shown to be a prototype of optical rogue-waves.
19 citations
TL;DR: In this paper, the authors demonstrate light-by-light polarization control via a nonlinear interaction occurring in single-mode optical fiber between a signal wave and a counter-propagating control pump beam.
Abstract: Controlling the state of polarization of a light beam propagating in a standard single-mode fiber by means of a lossless and instantaneous interaction is a fundamental effect of great interest for telecommunication applications and all-optical signal processing. In this paper, we experimentally demonstrate light-by-light polarization control via a nonlinear interaction occurring in single-mode optical fiber between a signal wave and a counterpropagating control pump beam. We observe a polarization attraction and stabilization of a 10-Gb/s optical telecommunication signal around 1550 nm for either return to zero or nonreturn to zero modulation format. These experimental results confirm yet another fascinating possibility to all-optical control the light properties in optical fiber.
17 citations
TL;DR: In this paper, the dispersion of the plasmonic Bloch modes supported by DLGs as a function of the period and the filling factor of the gratings is analyzed for fiber-to-fiber characterizations of DLSPPW components.
Abstract: Dielectric loaded gratings (DLGs) comprised of polymer gratings lying on a thin gold film are used to couple light at telecommunication frequencies in and out of plasmonic waveguides featuring sub-micron cross-sections. The grating couplers are found to be efficient and easy to implement to perform direct fiber-to-fiber telecommunication characterizations of dielectric loaded surface plasmon polariton waveguide (DLSPPW) components. By analyzing the dispersion of the plasmonic Bloch modes supported by DLGs as a function of the period and the filling factor of the gratings, efficient couplers comprised of gratings with a filling factor around 0.5 are designed and fabricated by a simple one-step electron beam lithography process. Typical losses in the range of -10 dB per coupler are obtained for gratings designed to operate at normal and 30°-tilted incidence. The performance of the couplers for normal incidence can be further improved by adding a back-reflecting Bragg mirror. We demonstrate the transmission of a 10 Gbits/s signal along a 75 μm-long DLSPPW by using DLG couplers for light injection and extraction. A power penalty below below 0.4 dB on the bit-error-rate has been measured over the entire C-band demonstrating the suitability of DLSPPWs for Wavelength-Division-Multiplexed high bit rate traffic and the efficiency of DLG couplers for fiber-to-fiber characterizations of stand alone DLSPPW components.
15 citations
TL;DR: In this article, with numerical simulations using the generalized nonlinear envelope equation, the processes of optical parametric and difference-and sum-frequency generation with incoherent pumps in optical media with both quadratic and third-order nonlinearity were studied.
Abstract: We study, with numerical simulations using the generalized nonlinear envelope equation, the processes of optical parametric and difference- and sum-frequency generation (SFG) with incoherent pumps in optical media with both quadratic and third-order nonlinearity, such as periodically poled lithium niobate. With ultrabroadband amplified spontaneous emission pumps or continua (spectral widths > 10 THz), group-velocity matching of a near-IR pump and a short-wavelength mid-IR (MIR) idler in optical parametric generation may lead to more than 15-fold relative spectral narrowing of the generated MIR signal. Moreover, the SFG process may also lead to 6-fold signal coherence improvements. When using relatively narrowband filtered noise pumps (e.g., spectral widths < 1 THz), the signal from optical parametric, sum-frequency, and difference- frequency generation has nearly the same spectral width as that of the incoherent pump.
10 citations
TL;DR: In this paper, a unified nonequilibrium thermodynamic description of the incoherent regime of supercontinuum generation has been provided, and the existence of spectral incoherent solitons induced by the Raman effect has been shown.
9 citations
TL;DR: In this paper, cross-correlation measurements using the two-photon absorption process in a semiconductor are experimentally demonstrated for two pulses of different wavelengths (shifted by ~200 nm) and durations (20 times ratio).
Abstract: Cross-correlation measurements using the two-photon absorption process in a semiconductor is experimentally demonstrated for two pulses of different wavelengths (shifted by ~200 nm) and durations (20 times ratio). These measurements were found to be highly repeatable and fully suitable for the determination of the temporal intensity profile of picosecond (ps) pulses.
2 citations
17 Jun 2012
TL;DR: In this article, a transition from continuous to discrete spectral incoherent solitons in the low-frequency edge of the supercontinuum spectrum was reported. But the transition was not considered in this paper.
Abstract: We study experimentally the highly nonlinear regime of supercontinuum generation in photonic crystal fibers. We report a transition from continuous to discrete spectral incoherent solitons in the low-frequency edge of the supercontinuum spectrum.
01 Jan 2012
TL;DR: The Kuznetzov-Ma soliton is a solution of the nonlinear Schrodinger equation derived in 1977 but never observed experimentally as mentioned in this paper, and it has been observed in optical fiber.
Abstract: The Kuznetzov-Ma (KM) soliton is a solution of the nonlinear Schrodinger equation derived in 1977 but never observed experimentally. Here we report experiments showing KM soliton dynamics in nonlinear breather evolution in optical fiber.
17 Jun 2012
TL;DR: The Kuznetzov-Ma soliton is a solution of the nonlinear Schrodinger equation derived in 1977 but never observed experimentally as mentioned in this paper, and it has been observed in optical fiber.
Abstract: The Kuznetzov-Ma (KM) soliton is a solution of the nonlinear Schrodinger equation derived in 1977 but never observed experimentally. Here we report experiments showing KM soliton dynamics in nonlinear breather evolution in optical fiber.
Patent•
02 Aug 2012TL;DR: In this article, a method and device for controlling a physical parameter of an optical signal was proposed, where a portion of the initial optical signal (SE) having passed through an optical waveguide from the input to the output (24.2) thereof, is returned into the optical channel using a sequential circulator (25) and an optical amplifier (28).
Abstract: The invention relates to a method and device for controlling a physical parameter of an optical signal. According to the invention, a portion of the initial optical signal (SE) having passed through an optical waveguide from the input (24.1) to the output (24.2) thereof, is returned into said optical waveguide (24) using a sequential circulator (25) and an optical amplifier (28), in order to at least partially form the optical control signal (SE2), which counter-propagates relative to said initial optical signal (SE), so as to stabilize, or at the very least control, the physical parameter of said initial optical signal when the latter exits said optical waveguide (24) via the output (24.2) thereof.
17 Jun 2012
TL;DR: In this article, the formation of colliding dispersive shock waves in the normal GVD regime and collective modulation instabilities in the anomalous GP regime were investigated in fiber four-wave mixing.
Abstract: Instabilities in fiber four-wave mixing are investigated, revealing the formation of colliding dispersive shock waves in the normal GVD regime and collective modulation instabilities in the anomalous GVD regime.
10 Jul 2012
TL;DR: The authors decrivons ici une experience mettant en evidence la dynamique du soliton KM a travers la propagation non-lineaire de breathers dans une fibre optique.
Abstract: Le soliton de Kuznetzov-Ma est une solution de l'equation de Schrodinger non-lineaire qui a ete identifiee des 1977 mais qui a ce jour n'avait encore jamais ete observee experimentalement. Nous decrivons ici une experience mettant en evidence la dynamique du soliton KM a travers la propagation non-lineaire de breathers dans une fibre optique.
10 Jul 2012
TL;DR: In this paper, the phenomene dabsorption a deux photons au sein d'un semi-conducteur is used to realiser des mesures de correlation croisee entre deux impulsions differentes en duree et longueur d'onde.
Abstract: Le phenomene d'absorption a deux photons au sein d'un semi-conducteur est utilise pour realiser des mesures de correlation croisee entre deux impulsions differentes en duree et longueur d'onde. Ces mesures sont appliquees a la reconstruction temporelle directe d'une impulsion picoseconde et a la mesure de retard optique.
17 Jun 2012
TL;DR: In this article, the simultaneous all-optical regeneration of the polarization state and the intensity profile of a 40 Gb/s Return-to-Zero telecommunication signal by means of Kerr effect occurring in a single segment of fiber was reported.
Abstract: We experimentally report the simultaneous all-optical regeneration of the polarization state and the intensity profile of a 40 Gb/s Return-to-Zero telecommunication signal by means of Kerr effect occurring in a single segment of fiber.
Patent•
02 Aug 2012
TL;DR: In this paper, a procedure and dispositif for the controle of a parametre physique dudit signal optique initial (SE) is presented. But this procedure is not applicable to the case of parametres.
Abstract: Procede et dispositif pour le controle d'un parametre physique d'un signal optique Selon l'invention, on retourne dans le guide d'onde optique (24), au moyen d'un circulateur sequentiel (25) et d'un amplificateur optique (28), une partie du signal optique initial (SE) ayant traverse ledit guide d'onde optique depuis son entree (24.1) jusqu'a sa sortie (24.2), pour former au moins en partie le signal optique de controle (SE2), contra-propageant par rapport audit signal optique initial (SE), de maniere a stabiliser, ou a tout le moins controler, le parametre physique dudit signal optique initial (SE) lorsque celui-ci sort dudit guide d'onde optique (24) par sa sortie (24.2).