415 research outputs found
Wavelength Multicasting and Amplification of 5 Gb/s Data in the 2 Micron Band
No full textWe report wavelength multicasting to three 5Gb/s channels around 1950nm via broadband four-wave-mixing between RZ-OOK modulated pump and O-band signals. The thulium-assisted configuration enables high fidelity copying and output powers of 10’s of mW.PHOS
Recent Advances on Nonlinear Optics in Silicon Nitride Waveguides
No full textNonlinear phenomena based on the material 2nd or 3rd order nonlinear susceptibility tensor χ(2) and χ(3), respectively, offer potential in a wide variety of applications by exploiting wave-mixing capabilities. The integration of these nonlinear effects at the chip scale represents the best path towards portable, compact and low power optical signal processing devices. A significant body of work has been done recently in this direction, in particular focusing on CMOS-compatible platforms. While many nonlinear effects have been demonstrated in Silicon, Silicon Nitride has recently sparked significant interest. Owing to a larger band gap, wide transparency window and low loss, the potential of SiN waveguides for linear and nonlinear optics is now well established. In this paper, we report recent results on nonlinear processes in SiN waveguides. In particular we will cover generation of an extremely broad supercontinuum extending 400 THz from the visible to 3.6 μm pumped by a turnkey telecom wavelength pulsed source. We will also report on a tunable pulse source based on dispersive wave generation in an engineered thick waveguide. Finally, we will show that SiN offers some interesting potential for χ(2) based nonlinear effects, an important step towards integrating second order nonlinearity on chip
Small core Chalcogenide photonic crystal fiber for midinfrared wavelength conversion: experiment and design
No full textKerr index and dispersion parameter of a small core chalcogenide photonic crystal fiber are estimated via four-wave mixing near 2μm. From these values, new fiber design is proposed to efficiently generate idlers in mid-infrared.PHOS
Law & Economics Perspectives on Electricity Regulation
No full textThis paper first reviews some of the main contributions of the new institutional economics to the analysis of the process of competitive transformation of network industries. It shows that neoinstitutional analysis is complementary to the microeconomics of rational pricing, since it accounts for the decisive role of an institutional framework adapted to new transactions. It emphasizes the importance of the political reform process, which draws on the conditions of attractiveness and feasibility to define an initial reorganization of property rights in these industries. The paper then analyzes in this light some of the main challenges ahead for electricity regulation: the question of investment in generation capacities and the link to long term contracts, the regulation of wholesale market power, the support to Renewable Energy Sources for Electricity (RES-E) and the design of new regulatory authorities.Electricity Markets; New Institutional Economics; Law & Economics
Versatile short-wave and mid-infrared sources based on wideband parametric conversion
No full textThe mid-infrared part of the optical spectrum is of high interest in a wide range of applications such as environmental gas monitoring, contaminant detection in the chemical, food or pharmaceutical industry, medical diagnosis, or defense and security. Relevant molecules can readily be identified through their mid-infrared absorption spectra, as the latter contains the fundamental resonances of a number of pollutant and toxic gases. Consequently, spectroscopic apparatus, light detection and ranging systems or free-space communication links all benefit from the progress accomplished by mid-infrared technologies over the last years. However some shortcomings in the light emitters capabilities are still to be addressed. In this research work, we aim at designing a mid-infrared laser as versatile as possible and based on nonlinear wavelength conversion. The conversion relies on third-order parametric effects in waveguides such as optical fibers made of various types of glass, or integrated semiconductor chips. The objective is to leverage mature communication-band components to generate and shape the seed optical signals, then mixed in the abovementioned waveguides to down-convert them towards midinfrared. The wavelength conversion is performed in two stages, and the first stage consists of a parametric source emitting in the short-wave infrared range. This thesis mostly focuses on the design and realization of this stage. As such, it is closely linked to the field of nonlinear fiber optics, where the use of silica is preponderant. We build on the research performed over the last years on parametric amplifiers, initially used for the re-amplification of communication signals, and we combine it with technologies dedicated to short-wave infrared fiber lasers. As such, we are able to build wavelength tunable and modulation-capable short-wave infrared sources, significantly more powerful and versatile than previous broadband parametric converter designs. The end of the dissertation is then dedicated to the solutions that are then envisioned to realize the second conversion stage, towards mid-infrared. Very promising numerical and experimental results indicate a successful outcome to the project, confirming the validity of the laser concept.PHOS
Continuous wave four-wave mixing at 2 micron in Chalcogenide microstructured fiber
No full textWe present the first demonstration of continuous-wave four-wave mixing at 2μm in short chalcogenide microstructured fiber. Idlers over approximately 15nm on anti-Stokes side of the pump were measured for a coupled pump power of 94mW.PHOS
All-optically induced quasi phase matching in SiN waveguides for second harmonic generation enhancement
No full textWe report more than 30dB second harmonic generation enhancement in SiN waveguide by all-optical writing of a persistent χ(2) grating. Phase matching peaks are observed for different writing wavelengths.LPQMPHOS
Efficient broadband parametric conversion: reaching for the Mid IR
No full textIn this paper, we report recent results on the efficient generation of SWIR sources exploiting broadband wavelength conversion in silica fibers. Optimized cavity-less designs of fiber parametric amplifiers (FOPA) associated with Thulium amplification capable of high CW powers, wide tunability and modulation will be presented. We also present how parametric conversion can be extended deeper in the Mid-IR by engineering of non-silica mixing platforms.PHOS
multi-user sessions materials
No full textSome of the materials recorded during the multi-user collaborative sessions
Credits
Timelapses:
3-tangra_concept_2.mp4 : Tanguy, Clémence
10-paper_summit.mp4: Softyoda, Laurent, Ultr-X, Ikxi, Swann // image reference author: Thomas Gugel
13-all_seing_monolith.mp4: Softyoda, Wuaieyo, Staz, Swann // image reference author: Stuart Wade
14-campsite.mp4: NotFood, Staz, Wuaieyo, Swann // image reference author: Mohamed Chahin
18-surreal_architecture.mp4: Staz, NotFood, Softyoda, Wuaieyo, Oenvoyage, Spacefarer, Tianerad, Fabian, Yoyodespin, Swann // image reference author: Michiel Schrijver
19-abstract_city.mp4: Adrien, Tanguy, Bruno, Gorgio, Axel // image reference author: Quan Pham Tung
20-scene_sky_island.mp4 : Fabian, NotFood, Wuaieyo, Staz, Swann // image reference author: Péng ái
22-xbox-clubs-image.mp4 : NotFood, Wuaieyo, Staz, Deajynn, Swann // image reference author: Alex Pushilin
25-castles.mp4 : Softyoda, Fabian, NotFood, Wuaieyo, Swann // image reference author: Timothy J. Reynolds
27-random_house_5.mp4: NotFood, Wuaieyo, Swann // image reference author: Mohamed Chahin
28-wind_mill_in_nemcice.mp4: Wuaieyo, NotFood, Swann // image reference author: Febin_Raj
33-ancient_gods_threshold.mp4 NotFood, Kysios, Wuaieyo, Swann // image reference author: Elodie Mondoloni
Animation projects results:
34-outrun_result.gif: NotFood, Fabian, Wuaieyo, Ultr-X, Swann
35-mstrd_II_result.gif: Tanguy, Gorgio, Adrien // image reference author: gifmk7
36-elmo_result.gif: Gorgio, Fabian, Tanguy, Adrien
(more to come
Large second harmonic generation enhancement in Si3N4 waveguides by all-optically induced quasiphase- matching
No full textEfficient second harmonic generation in integrated platforms is usually achieved by resonant structures, intermodal phase-matching or quasi-phase matching by periodically poling ferroelectric waveguides. However, in all these structures, it is impossible to reconfigure the phase-matching condition in an all-optical way. Here, we demonstrate that a Watt-level laser causes a periodic modification of the second-order susceptibility in a silicon nitride waveguide, allowing for quasi-phase-matching between the pump and second harmonic modes for arbitrary wavelengths inside the erbium band. The grating is long-term inscribed, and leads to a second harmonic generation enhancement of more than 30 dB. We estimate a χ(2) on the order of 0.3 pm/V, with a maximum conversion efficiency of 0.05%W−1. We explain the observed phenomenon with the coherent photogalvanic effect model, which correctly agrees with the retrieved experimental parameters.PHOSLLPQ
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