Methods for coating an optical fiber with optical fiber Bragg grating (FBG) with a hermetic coating, particularly a coating of carbon, are employed to avoid ingress of gases, vapors or fluids in the ambient environment. This ingress can be from water or hydrogen, which can diffuse in the fiber glass and cause deviation/drift in the measured Bragg measurements. Bragg gratings that maintain the grating strength at temperatures in excess of C. are used and can be formed by heating the fiber above C. in a chamber with a reactive gas that produces deposition of carbon.


> Optical fiber slack storage tray for distribution cabinet

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