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Proceedings Paper

Radiation-induced loss studies in Er-doped fiber amplifier systems
Author(s): William C. Goltsos
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Paper Abstract

Radiation-induced loss in erbium-doped fiber and fiber-based components used in optical amplifiers at 1.5 micrometer has been studied under electron and gamma irradiation up to total doses of 100 krad(Si). Radiation sources used to simulate the natural space environment were a Van de Graaff generator for 1.5 MeV electrons, and Cobalt-60 for 1.17 and 1.33 MeV photons. Induced-loss and 60-hour anneal were measured in Er-doped fiber while simultaneously illuminated with 0.7 W of 980-nm pump, and 1 mW of 1550-nm signal light in an operating amplifier configuration. Initial induced loss from electron irradiation was found to decrease under intense photoillumination to 0.010 dB/m-krad at 980 nm and .007 dB/m- krad at 1550 nm, versus 0.017 dB/m-krad and 0.008 dB/m-krad respectively when unilluminated, and showed a more rapid anneal in some tested fibers. Individual components of an optical isolator were tested for gamma-irradiation sensitivity. A 1 degree change in polarization rotation angle was found in a garnet-film Faraday rotator after exposure, and the GRIN lens showed an initial induced loss of 0.5 dB that annealed to 0.1 dB after 2 weeks under conditions of 1 mW, 1550-nm photoillumination.

Paper Details

Date Published: 22 April 1996
PDF: 6 pages
Proc. SPIE 2699, Free-Space Laser Communication Technologies VIII, (22 April 1996); doi: 10.1117/12.238420
Show Author Affiliations
William C. Goltsos, MIT Lincoln Lab. (United States)


Published in SPIE Proceedings Vol. 2699:
Free-Space Laser Communication Technologies VIII
G. Stephen Mecherle, Editor(s)

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