OPTICAL FIBER

PROBLEM TO BE SOLVED: To eliminate a process for a heat treatment for discharging hydrogen to the outside after a high-pressure hydrogen process by removing part of a carbon layer from a carbon-coated fiber formed by coating a bare fiber with a carbon layer and forming a grating on the core of the e...

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Bibliographic Details
Main Authors WATANABE KAZUKI, OTA IKUO, YODO SHIGETO
Format Patent
LanguageEnglish
Published 17.11.1998
Edition6
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To eliminate a process for a heat treatment for discharging hydrogen to the outside after a high-pressure hydrogen process by removing part of a carbon layer from a carbon-coated fiber formed by coating a bare fiber with a carbon layer and forming a grating on the core of the exposed bare fiber. SOLUTION: The carbon-coated fiber formed by coating the surface of the bare fiber 1 with the fine carbon layer 2 is used and the optical fiber 1 having the carbon layer 2 removed within a specific range is put in a specific processing chamber and treated with hydrogen in a high-pressure hydrogen atmosphere. The specific part which has the carbon layer 2 removed is irradiated by an excimer laser to vary the refractive index, thereby forming a grating 1c. Therefore, hydrogen penetrates only the part of the bar fiber 1a which has the grating 1c formed by removing the carbon layer 2 and the part impregnated with the hydrogen can be made extremely small, so the process for the heat treatment can nearly be eliminated.
Bibliography:Application Number: JP19970118288