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Proceedings Paper

Improvement In Radiation Resistivity Of Pure-Silica Core Fibers
Author(s): T. Suzuki; K. Obi; T. Cozen; H. Tanaka; S. Okamoto
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Paper Abstract

Influences of the impurities in fiber materials on radiation resistivity of pure-silica core fibers were studied by using 60Co as the gamma ray source at room temperature and at -55°C in terms of impurities in cladding materials and Cl and OH contents in core materials. As to the influence of the impurities in cladding materials, MRT (Modified Rod-in-tube) multi-mode fibers with natural. silica and synthetic silica as the support layer were tested. After 104 R exposure at -55 °C, radiation-induced loss of the fiber with synthetic silica was 3.9 dB/km at 1300 nm, while that of the fiber with natural silica was 31.1 dB/km. Similar results were obtained on single-mode fibers, indicating that the cladding material without impurities is effective in improving radiation resistivity Measurements of radiation-induced loss spectra in the wavelength range from 400 nm to 1100 nm during the irradiation revealed that Cl in the core particularly increases radiation-induced losses at low temperatures. Cl-free fibers demonstrated loss increase ranging from 0.2 to 0.4 dB/m at 400 nm after 3 x 104 R exposure at -55 °C while Cl-containing fibers showed radiation-induced losses over 0.8 dB/m. OH ions were found to improve the radiation resistivity at short wavelengths irrespective of Cl contents. Measurements of loss spectra in ultraviolet region revealed that Cl and OH ions are closely related with the formation of color centers.

Paper Details

Date Published: 26 April 1989
PDF: 7 pages
Proc. SPIE 0992, Fiber Optics Reliability: Benign and Adverse Environments II, (26 April 1989); doi: 10.1117/12.960027
Show Author Affiliations
T. Suzuki, Mitsubishi Cable Industries, Ltd. (Japan)
K. Obi, Mitsubishi Cable Industries, Ltd. (Japan)
T. Cozen, Mitsubishi Cable Industries, Ltd. (Japan)
H. Tanaka, Mitsubishi Cable Industries, Ltd. (Japan)
S. Okamoto, Radiation Center of Osaka Prefecture (Japan)


Published in SPIE Proceedings Vol. 0992:
Fiber Optics Reliability: Benign and Adverse Environments II
Roger A. Greenwell; Dilip K. Paul; Shekhar G. Wadekar, Editor(s)

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