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For DC current measurement, we have developed optical current transformer (OCT) based on Faraday effect using reflection Sagnac interferometer and performed the field test in Hokkaido-Honshu HVDC Link in Japan from Feb. 2008 in order to confirm its stability over time, and through environment condition. The developed OCT was designed to be installed at the bottom of the cable head bushing without...
We have confirmed that the photodarkening of Yb-doped fiber (YbDF) has the second-power dependence on a population inversion factor. The photodarkening of a newly developed highly aluminum-doped YbDF has been significantly suppressed
The beat spectrum of white spectral probe signals and a pump laser are used to directly give the Brillouin gain spectrum on an RF spectrum analyser. The measured peak gain coefficient is about 2.3*10/sup -11/ m/W and the Brillouin linewidth is 29 MHz which can be further broadened by the additional strain distribution.<<ETX>>
The base material currently used for optical fiber waveguides (optical fibers) is silica. By adding various impurities, properties required for optical transmissions are created. When these optical fibers are used in a particular environment, such as a nuclear reactor, damage caused by radiation from the source becomes a serious problem. It is well-established that when optical fibers are exposed...
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