Abstract
AbstractA flame‐resistant optical fiber with a stainless steel sheath is proposed. As a result of the flame test (IEEE 383 Standard) on a 12‐fiber optical fiber cable based on the proposal, it was found that only the corrosion‐protective paint on the stainless steel surface, which was exposed to the flame, was burned (burn length 30 to 45 cm). During this IEEE 383 Standard Flame Test, the fiber did not show any increase of optical loss. However, the optical loss began to increase within a certain period of time after the flame test, and the period is longer when the softening temperature of the secondary coating material is lower. The stainless steel surface should be coated with corrosion‐resistance paint. As a result of the corrosion test, the chromate treatment is suitable for surface treatment. Vinyliden fluoride paint, dicarbolic acid paint with glycidyl acrylic or oil‐free melamine polyester paint are effective for corrosion protection.
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