Search

International audience; Holey fibres have a broad range of optical properties thanks to their microstructuration and offer a wide range of applications. The combination of intrinsic properties of compound glass, such as chalcogenide glass, and a microstructured fibre geometry allows to consider exacerbated optical properties such as dispersion and nonlinearity for these fibres. In this study, high-index sulphide glass holey fibres (n = 2.251 at 1.55 μm) have been accomplished using the capillary-stacking technique. Sulphide glasses from the GeGaSbS system are used. The drawing step is crucial for microstructuration and for determination of optical properties. Sulphide holey fibres, which were optically characterised with near-field spectroscopy at 1.55 μm, show a single-mode guidance with an effective mode area of 108 μm2.

International audience; To fulfill International Telecommunication Union (ITU) recommendations for Wavelength Division Multiplexing (WDM) optical network with an anchorage at 193.1 THz nominal frequency, Bragg gratings filters need a precise photo-writing process. In this paper, we describe a precise method to fine-tune (

The optimization procedure for designing silica integrated components (specially in the telecommunication infrared spectrum, around wavelength 1550 nm) uses specific index liquids as a core top layer. These liquids consist of transparent silicone oils which present a very low vapor pressure. In this paper we present an accurate method to measure the thermo-optical coefficient of these liquids. We determine that, for liquid based silicone, this coefficient is −4.5×10 −4 K −1 . By the way, this technique also enable us to know the behavior of integrated directional coupler as thermo-optical switch. These experiments are useful to design such kind of integrated components.

With a view to improving the realisation of polymer optical waveguide some features relevant to the photolithography process are analysed. This paper focuses on defects that occur on the surface of polymer layers involved in the process. For example, depending on the heat treatment or the deposited material, some worm-like defects appear on the polymer surface. When they occur, the waveguide surface roughness becomes too high (about one hundred nm and more). This means that the optical performance of the waveguides is too poor. In this document, we show the changes in temperature on polymer film surfaces which are coated with a thin inorganic layer and the occurrence of these defects is observed. This work confirms that the defect occurrence is clearly linked to the glass transition temperature. The paper reports that, in some cases, the adjustment of thermal properties by annealing can advantageously shift the glass transition, without changing the target optical properties.