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 how 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 87�. 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.
展开▼
