Optical fiber core wire

Abstract

Abstract PURPOSE:To soften clamping by contraction of the time of a low temperature, and to obtain a good optical fiber core wire by enlarging gradually toward the outside a Young's modulus of at least a secondary coating layer, in a buffer layer and the secondary coating layer. CONSTITUTION:A primary coating layer 2, a buffer layer 4-1, and secondary coating layers 3-1, 3-2 are provided on a glass fiber 1. Also, a material whose Young's modulus is high is placed on the outermost layer 3-2 of the secondary coating, a material whose Young's modulus is comparatively low is placed on its inside, and a double layer structure of the secondary coating is formed. The optical fiber is a multi-graded type fiber by a CVD method and has 50mum core diameter, 125mum outside diameter and 1.0% specific refractive index difference, and immediately after spinning, a silicone resin of 1.52 refractive index and 0.2kg/mm.<2> Young's modulus is applied and hardened to thickness of about 50mum.

Inventors

• 👤 Hiroaki Kuranashi
• 👤 椋梨　浩明
• 👤 Hiroshi Shinba
• 👤 榛葉　弘
• 👤 Yukinori Ishida
• 👤 石田　之則

Bibliographic Details