| 摘要 |
PURPOSE:To obtain the titled fiber having an excellent optical transmission characteristic in a near infra-red range, and to lessen an increasement of a loss under a high temperature and a humidity conditions by using as a core component, the polymer contg. a specific fluorine substd. deuterium styrene unit as an essential repeating unit. CONSTITUTION:The core component composes of the polymer contg. the fluorine substd. deuterium styrene unit. shown by the formula as the essential repeating unit. The rate of depressing the refractive index by substituting with the fluorine atom is not large in the core component. Almost all materials which are used as a sheath component in the case of optical fiber that PMMA is used as the core component, are used as the sheath component. The extent of the selection of the sheath component is very wide. By substituted a hydrogen atom of an aromatic ring contd. in the styrene polymer with the fluorine atom and the heavy hydrogen atom, a hygroscopicity of the obtd. polymer is remarkably decreased. A vibration absorption strength of the O-H bonding due to the hygroscopicity reduces not only in the visible range but also in the near infra-red range. |
