摘要:
The invention relates to a fibre sensor that enables the propagation of infrared light at at least one wavelength of 0.8 to 25 micrometres, the fibre successively comprising along its length a first infrared waveguide section (23), a second detection section (25) intended to come into contact with an external environment in order to detect infrared signatures interfering with the propagation of the evanescent waves propagating along the fibre (2), and a third infrared waveguide section (27). The invention is characterized in that, in the second fibre section (25) that has the detection role, the fibre (2) is constituted of a curved part, the radius of curvature of which is locally less than 2.3 millimetres.
摘要:
Energy efficient process and apparatus are disclosed for forming migration free glass fiber packages composed of fibers (16) bearing substantially uniform coatings of size composition. Heated air from around the fiber forming bushing (12) is drawn into a chamber (56) through which the glass fibers (16) pass to cause the water or solvent in the applied size to be evaporated. The flow of heated air through the chamber (56) is regulated so as to obtain substantially uniform size application to the fibers (16).
摘要:
Touch assembly and method are described for fabricating a spliced low-loss, high-strength optical transmission line. A first fiber is spliced to a second fiber at a splice point. The spliced fibers are loaded into a heat treatment station, where a gas torch flame is used to thermally treat a splice region including the splice point, with the thermal treatment reducing splice loss due to expansion and mismatch of modefields between the first and second fibers. While heating the splice region, a dry gas is purged around the torch flame during the heat treatment process to avoid water at the surface of the spliced fibers. A purging gas is fed to the torch flame to purge dust particles from the flame, and after the heat treatment has been completed, the torch flame is used to restore the glass surface of the spliced fibers. Additionally described are torch assemblies for fabricating low-loss, high-strength optical fiber transmission lines.
摘要:
A fiber optic coupler (51) is automatically manufactured under the control of a programmable controller (79). A fiber feed device (26) sends fibers (16-17) through a tube (50). Fibers (16-17) are stored in the tube (50). Chucks (57-58) pull in opposite directions to form a tapered coupling region. Epoxy dispensers dispense epoxy into uncollapsed ends of the coupling tube (12) bore. A UV light sources (70) cures the epoxy. The control of the apparatus by programmable controller eliminates operator inconsistencies and improves process reproducibility.
摘要:
Energy efficient process and apparatus are disclosed for forming migration free glass fiber packages composed of fibers (16) bearing substantially uniform coatings of size composition. Heated air from around the fiber forming bushing (12) is drawn into a chamber (56) through which the glass fibers (16) pass to cause the water or solvent in the applied size to be evaporated. The flow of heated air through the chamber (56) is regulated so as to obtain substantially uniform size application to the fibers (16).
摘要:
A method of manufacturing a silica glass article comprising: (1) placing a starting silica glass article in an atmosphere containing hydrogen molecules to introduce hydrogen molecules into said starting silica glass article at a concentration of not lower than 1 x 10 16 molecules/cm 3 ; (2) taking said hydrogen-introduced silica glass article out of the atmosphere containing hydrogen molecules; and (3) irradiating said silica glass article with at least 10 6 pulses of an excimer laser beam having an energy of 10 mJ per pulse within a period in which the concentration of hydrogen molecules remaining in said silica glass article is not lower than 1 x 10 16 molecules/cm 3 , to obtain a processed silica glass article which causes substantially no increase in its light absorption in an ultraviolet region. Also disclosed are silica glass articles and optical fiber processed employing the above method.