Radiation hardness of present optical fibres

Henning Henschel

doi:10.1117/12.198638

30 December 1994 Radiation hardness of present optical fibres

Henning Henschel

Proceedings Volume 2425, Optical Fibre Sensing and Systems in Nuclear Environments; (1994) https://doi.org/10.1117/12.198638
Event: Optical Fibre Sensing and Systems in Nuclear Environments, 1994, Mol, Belgium

Abstract

Optical fibers find rapidly growing use also in the nuclear industry. The dependence of their radiation-induced loss on fiber type, wavelength, temperature, light power, dose rate, and radiation type (gamma rays, neutrons) is pointed out and test results of modern (1989 - 1993) single mode (SM), graded index (GI), multimode stepindex (MM SI), and polymer optical fibers (POF) are presented. Continuous ⁶⁰Co gamma irradiation of the SM fibers with a dose rate of about 1.5 Gy/s up to a final dose of 10⁶ Gy led to radiation-induced losses of only 0.85 to 1.3 dB/10 m at 1300 nm wavelength and temperatures around 30 degree(s)C, whereas the GI fibers had losses of 1.3 to 2 dB/10 m under the same conditions. The lowest radiation-induced loss show MM SI fibers with pure SiO₂ core of high OH-content: about 0.15 dB/10 m around 850 nm and about 0.1 dB/10 m around 1060 nm (10⁶ Gy, equals 30 degree(s)C). POF with a core made of polymethyl methacrylate also have loss increases of <EQ 0.1 dB/10 m (670 nm, room temperature), but only up to gamma dose values <EQ 800 Gy. The breaking stress of allglass fibers after 10⁶ Gy increased by about 2% (MM SI) up to about 10% (SM). 14 MeV neutron irradiations seem to cause higher losses and reduced breaking stress, compared with ⁶⁰ Co gamma irradiations up to the same total dose.

Citation Download Citation

Henning Henschel "Radiation hardness of present optical fibres", Proc. SPIE 2425, Optical Fibre Sensing and Systems in Nuclear Environments, (30 December 1994); https://doi.org/10.1117/12.198638

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