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We consider formation of ultrashort quasi-parabolic pulses in conventional silica fibers both in the near and far fields of dispersion. Through solution of nonlinear Schrödinger equation we show that in case of high soliton order N the optical wave breaking effect, occurring in optical fibers during ultrashort pulse propagation, is canceled in the far field of dispersion. This is accompanied by nonlinear...
We investigated numerically the reflectivity of aperiodic multilayer mirrors for broadband supercontinuum reflection. It was shown that multilayer mirror based on TiO2/SiO2 with layer thicknesses changed in the nonlinear way can provide high reflectivity from 468 nm to 1600 nm.
Chalcogenide glasses are based on a mixture of chalcogen elements (Sulphur, Selenium and Tellurium) and other elements such as Arsenic, Germanium, Antimony or Gallium. Compared to silica glasses, they offer several distinctive optical properties such as their transmission window which extends far into the infrared spectral region (up to 25μm for telluride glasses). Chalcogenide glasses also exhibit...
We demonstrate normal and anomalous dispersion engineering as well as self phase modulation induced pulse spectral broadening in silicon nitride waveguides. Nonlinear losses are shown to be absent up to peak intensities of 12GW/cm2.
Light-activated multiplexer/demultiplexer silicon-carbon devices are analyzed. An electrical model for the device operation is presented and used to compare output signals with experimental data. An algorithm that takes into accounts the voltage and the optical bias controlled sensitivities are developed. The device is a double pi'n/pin a-SiC:H heterostructure with two optical gate connections for...
Photonic crystal fibers (PCFs) consist of arrays of micrometer-size hollow channels extending along the entire fiber length. A new approach to modify the optical properties and to improve the design flexibility of such fibers is to fill the air holes of the array by with different materials, realizing all-solid hybrid fiber structures. In this talk, recent results on silica PCF filled with noble metals,...
Chalcogenide glasses are known for their large transparency in the mid infrared and their high refractive index (>2). They present also a high non linear coefficient (n2), 100 to 1000 times larger than for silica, depending on the composition. An original way to obtain single-mode fibers is to design microstructured optical fibers (MOFs). In addition, these fibers present unique optical properties...
Silica aerogel is a very light and highly porous form of silica glass, with densities and refractive indices much lower than those of ordinary solids. We describe optical interactions with aerogel surrounding tapered fibres or inside the holes of photonic crystal fibres. This enables a new class of fibre devices exploiting the properties of the aerogel as a rigid yet porous replacement for air, as...
In this paper, we have characterized a mid-IR nonlinear photonic device consisting of a highly nonlinear As2Se3 nanowire and a novel photonic crystal structure on silica clad. The lowest optical confinement was found about 60% over the entire bandwidth for an optimum nanowire radius of 600 nm. The highest anomalous GVD obtained was about 1348 ps/nm. km with the lowest anomalous GVD bandwidth of around...
The Raman gain in suspended-core and nanowire silica optical fibers significantly depends on the relative propagation directions of the pump and Stokes waves, enabling applications for nonreciprocal components.
A comparison is made between DC-induced three wave mixing and four wave mixing processes. Enhanced nonlinear generation terms offer significant advantages for the DC-induced process across a wide range of pulse widths despite dispersion disadvantages.
We theoretically compare the soliton self-frequency shift in silica and As2S3 glasses. We find very similar behavior even though the shape of the Raman spectra are very different.
We demonstrate C-band subpicosecond wavelength conversion over > 100nm, exploiting four wave mixing in a high index doped silica waveguide spiral of 45cm, showing a +16.5dB net gain for a 40W peak pump power.
We demonstrate spectral broadening in tapered optical fibres embedded in silica aerogel. The aerogel provides protection to the taper without noticeably affecting the refractive and dispersive properties or power handling.
We demonstrate a CMOS-compatible, integrated optical parametric oscillator in a high-index doped silica glass ring resonator. We obtain lasing with wavelength spacings from 200 GHz to > 6THz, with a threshold as low as 54mW.
The induced grating autocorrelation technique was used to measure γ in short lengths of solid-core photonic crystal fibers (SC-PCFs): a 35-cm highly nonlinear PCF and two large mode area PCFs of lengths 4.5-m and 4.9-m.
We experimentally show that the windows frequently used for filament cells have a decisive influence on nonlinear pulse shaping, determining the group-delay-dispersion of the self-compressed pulses.
Third harmonic generation in fibre nanotapers by intermodal coupling is experimentally characterized. UV radiation is generated from a pulsed 1064 nm laser in a 3 cm taper of 492 nm diameter.
Micro- and nanofibers present attractive optical properties and may be used in a variety of structures and devices. We report in this work the first global study on the non linear properties of these microfibers: an adequate source is built and its characteristics are described, our first results with a silica loop resonator are presented. Third harmonic generation is obtained in these conditions,...
Silicon-core optical fibers were fabricated by the “rod-in-tube” method. Optical losses were reduced to the level of 11-12 dB/cm in a wavelength range of 1.5-6.7 μm owing to a post-drawing treatment similar to zone melting.
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