| 摘要 |
PURPOSE:To maintain the optical transmission characteristics over a long period by specifying drawing strength on the interface between a quartz glass-base optical fiber and a primary coating layer. CONSTITUTION:A primary coating layer 2 and a secondary coating layer 3 on an optical fiber 1 are made of an ultraviolet-curing org. high molecular resin. The primary coating layer 2 is required to have >=0.5kg/cm drawing strength on the interface between the coating layer 2 and the optical fiber 1 at 25 deg.C and 50% relative humidity and >=0.45kg/cm drawing strength at 25 deg.C and 90% relative humidity. The secondary coating layer 3 may be a known conventional resin for an optical fiber. The coating layers maintain superior adhesive strength to the quartz glass-base optical fiber even after use for a long period and the deterioration of the optical transmission characteristics with the lapse of time can be prevented.
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