KEYWORDS: Signal attenuation, Optical fibers, Annealing, Data modeling, Color centers, Aerospace engineering, Single mode fibers, Gamma radiation, Astronomical engineering, Hydrogen
Radiation testing of 980 nm single mode optical fiber, at 120 krads total dose was performed at three temperatures (minus 30 degrees Celsius, plus 96 degrees Celsius, and room temperature). Testing was also performed on samples from different sections of the optical fiber drawn from a single preform that was designed for a lower cutoff wavelength this fiber is referred to as (Flight), and an off-the-shelf (OTS) 980 nm optical fiber from the same manufacture. The results of this data are discussed in this paper and a projection of the damage to the optical fibers over a five year period was done using the nth order kinetic model developed by J. Friebele et al.
During the past year, Martin Marietta Astronautics conducted an intensive trade study to compare optical fibers for radiation performance, to determine the availability of buffer materials for space, and to ascertain current capabilities of cabling manufacturers. In addition, we investigated single-fiber and multi-fiber connectors and backshells for multimode and single-mode optical fibers for flight hardware. The trade study included numerous literature searches and discussions with vendors and experts in the field to determine product availability of components and the manufacturing of flight harnesses.
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