| http://www.w3.org/ns/prov#value | - In the case of the optical fiber laid in the sea water or in the atmosphere, there is a problem that it has particularly large hydrogen secular variation loss. [0140] With respect to these problems, prior to the actual use of an optical fiber, there is a proposal of D2 processing whereby prior to its actual use, the optical fiber is exposed to a deuterium (D2) atmosphere and then left standing in
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