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  • 1
    Electronic Resource
    Electronic Resource
    Preparation of Optical Cores of Silica Optical Fibers by the Sol-Gel Method (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 889-893 
    Details
    ISSN: 1573-4846
    Keywords: optical fiber ; rare-earth element ; fabrication ; sol-gel method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Preforms for drawing silica optical fibers have been fabricated by using the MCVD method for the preparation of the optical claddings and the sol-gel method for the preparation of the optical cores consisting of TiO2-SiO2 or RE3+-Al2O3-P2O5-SiO2 (RE = Er, Yb) glasses. A novel method has been developed for depositing thin gel layers on the inner silica tube wall, under rotation of the tube inclined at a small angle to the horizontal. The gel layers have been deposited from sols prepared by mixing Si(OC2H5)4, POCl3, Ti(n-OC4H9)4, AlCl3, ErCl3, YbCl3, H2O, C2H5OH and HCl. The gel layers deposited using these sols on the inner tube wall were heat-treated in a flow of CCl4 or POCl3 with O2 at temperatures of from 800° to 1400°C. After collapsing the composite tube into a preform, an optical fiber has been drawn. The refractive-index profiles of the preforms and the attenuation spectra of the drawn fibers are shown, as well as some results on the lasing characteristics of Yb3+ sensitized, Er3+ doped fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018327300640
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of optical cores of silica optical fibers by the sol-gel method (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 889-893 
    Details
    ISSN: 1573-4846
    Keywords: optical fiber ; rare-earth element ; fabrication ; sol-gel method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Preforms for drawing silica optical fibers have been fabricated by using the MCVD method for the preparation of the optical claddings and the sol-gel method for the preparation of the optical cores consisting of TiO2−SiO2 or RE3+−Al2O3−P2O5−SiO2 (RE=Er, Yb) glasses. A novel method has been developed for depositing thin gel layers on the inner silica tube wall, under rotation of the tube inclined at a small angle to the horizontal. The gel layers have been deposited from sols prepared by mixing Si(OC2H5)4, POCl3, Ti(n-OC4H9)4, AlCl3, ErCl3, YbCl3 H2O, C2H5OH and HCl. The gel layers deposited using these sols on the inner tube wall were heat-treated in a flow of CCl4 or POCl3 with O2 at temperatures of from 800° to 1400°C. After collapsing the composite tube into a preform, an optical fiber has been drawn. The refractive-index profiles of the preforms and the attenuation spectra of the drawn fibers are shown, as well as some results on the lasing characteristics of Yb3+ sensitized, Er3+ doped fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436956
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Doping Silica Gel Layers with TiOTi-Chains and Cu2+-Ephedrine on the Sensitivity of the Layers to Gases (2000)
    Springer
    Journal of sol gel science and technology 19 (2000), S. 197-200 
    Details
    ISSN: 1573-4846
    Keywords: thin layer ; optical fiber ; copper ephedrine doping ; effect of gases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In this paper the interaction of polysiloxane and TiOTi-doped polysiloxane gel layers containing Cu2+-ephedrine (CuEP) with carbon dioxide, nitrogen and water is investigated. This interaction is studied through changes of the output optical power from an optical fiber coated with the investigated gel layer. The layers are prepared with sols based on tetraethoxysilane and titanium isopropoxide, isopropanol, acetylacetone and Cu2+-ephedrine by the repeated dip-coating method. The applied gel layers are dried at 70°C. Spectral and temporal changes of the output optical power due to effect of the tested gases are measured. The measurements show big changes of the output optical power of fibers coated with CuEP-doped silica gel layers in a wavelength range from 400 to 700 nm, which is in relation with spectral effects of CuEP in alcoholic solutions. Relatively lower changes of the attenuation spectra without any attenuation band are found in the spectra of TiOTi-doped siloxane gel layers containing CuEP. The angular distributions of the output optical power of the coated fibers indicate high optical losses of the layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008775919442
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