In this paper, erbium doped fibers for space detection are researched for feature of radiation resistance.
Fibers with different coated carbon are hydrogen loaded and radiated, and too thick of carbon layer around fiber
would not bring best radiation-resistant performance, since thick carbon layer would make the entering of hydrogen
difficult. We also research the duration of saturated hydrogen loading under the high and low temperature
respectively, and it’s found that the fibers’ photo sensitivities tend to be flat after some days. Hydrogen is reloaded
into the fibers which have been loaded once, this help us to deep understand the mechanism of hydrogen loading for
the fiber gratings. Loss and wave width changes are also researched under different radiation dose.
KEYWORDS: Optical fibers, Nonlinear optics, Optical testing, Signal attenuation, Single mode fibers, Cladding, Lithium, Electronics, Ions, High power lasers
The power output of 2km and 8km 80μm selected cut-off wavelength single mode optical fiber was measured by 2.4W ASE fiber source at 1550nm waveband. The results show that obvious nonlinearity in 2km fiber does not occur by way of output power and spectrum. Slight nonlinearity is seen in 8km fiber. The power variation is small during the test of power stability with 1.28W input in 8km fiber.
Absorption coefficient is a very useful feature for active fiber. In fiber laser system, the length of active fiber is chosen according to absorption coefficient. And the length of fiber can directly influence the feature of fiber laser. Therefore, how to obtain an accurate absorption coefficient is very important. Because fiber exists re-emission in typical absorption band pumped by power. It is difficult to accurately measure absorption coefficient. The absorption coefficients of Yb-doped double cladding fiber at 975 nm measured by several methods were compared. In conclusion, for the fibers with same length pumped by white light, the absorption coefficient is the highest when cutback only once. Meanwhile, when fibers with different length were measured by the same method, the absorption coefficient is inversely proportional to optical fiber length.
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