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Radiation-induced loss of optical fibres at 1300 nm and 1550 nm wavelength

: Henschel, H.; Köhn, O.; Schmidt, H.U.

Postprint urn:nbn:de:0011-n-2712 (167 KByte PDF)
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Copyright 1996 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Created on: 25.9.2010

Taylor, E.W. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Photonics for space environments IV : 6-7 August 1996, Denver, Colorado
Bellingham, WA: SPIE, 1996 (Proceedings of SPIE 2811)
ISBN: 0-8194-2199-5
Conference on Photonics for Space Environments <4, 1996, Denver/Colo.>
Conference Paper, Electronic Publication
Fraunhofer INT ()
1300 nm; 1550 nm; annealing time; irradiation time; gamma irradiation; irradiation time variation; optical fibres; radiation induced loss

The radiation-induced loss of single mode fibres with undoped and Ge-doped core material was measured at 1300 nm and 1550 nm in the time range from 0.1 s to < 500000 s at room temperature (+25øC). With the Ge-doped fibre, measurements were also made at -50øC and +80øC. The ratio of the losses at 1300 nm and 1550 nm increased at +25øC with both fibre types within about 10 s to a maximum value of ÷2 (Ge-doped) or ÷ 2.7 (undoped). Then the ratio decreased continuously and became < 1 (= higher loss at 1550 nm) after about 35000 - 70000 s (Ge-doped) or > 350000 s (undoped). After ÷ 500000 s a value of ÷ 0.75 was reached with the Ge-doped fibre, with an observable tendency to fall further. At -50øC the ratio increased up to about 2.2 and remained constant (as if frozen) during the whole irradiation time of 500000 s. At +80øC, however, the radiation-induced loss at 1550 nm was higher at the beginning and became lower than the one at 1300 nm only after an irradiation time of > 10E+4 s. Additi ally the annealing time of loss was measured after the end of irradiation for varying irradiation times between about 3 s and 400000 s. The results can qualitatively explain the radiation-induced loss curves at 1300 nm and 1550 nm as well as their ratio.on