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TRANSCRIPT
~*If¥~f1J ~+1L,g ~=WJ (=OOJViF-tJ=l )Journal ofEngineering, National Chung Hsing University, Vol. 19, No. 2, pp . 101-109 (2008)
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EFFECTS OF THE CARBON COATING THICKNESSON THE PROPERTIES OF HERMETICALLY
CARBON-COATED OPTICAL FIBERS PREPARED
BY METHANE PYROLYSIS OF THERMALCHEMICAL VAPOR DEPOSITION
Kai-Jen Cheng Hsun-Yu Lin Shin-Shueh Chen Sham-Tsang Shiue *
Department ofMaterials Science and Engineering,
National Chung Hsing University,
Taichung 402, Taiwan, R.O.C.
Key Words: optica l fiber, pyrolytic carbon, chemical vapor deposit ion, coating thickness .
l ~~~$*~MflW~WI~~*~±2 ~~~~*~MflW~WI~~*m±3 m~~Q*~MflW~WI~~*~~•Corresponding author, E-mail: [email protected]
102
ABSTRACT
The effect of the coating thickness on the properties of hermetically carbon-coated optical
fibers prepared by thermal chemical vapor deposition using methane as the precursor gas is
investigated. Results show that the number and size of conical particles on the carbon coating
surface increase with increasing the coating thickness, while the structural order of the carbon
coating decreases. The bonding form and surface energy of carbon coatings are not changed
when the coating thickness increase. When the carbon coating thickness is 913 nm, the coating
surface has the lowest roughness of 0.4 nm and the highest water contact angle of 8T. When the
carbon coating thickness exceeds 799 nm, the carbon-coated optical fiber can sustain under the
thermal loading. Based on the water-repellency of the carbon coating and the ability of
carbon-coated optical fibers to sustain under the thermal loading , the carbon film with the
coating thickness of 913 nm is optimized for production of hermetically sealed optical fiber
coatings.
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Manuscript Received: Apr. 01,2008
Revision Received: May 26, 2008
andAccepted: Jun. 15, 2008