| 摘要 |
PURPOSE:To prevent the adhesion of a dust to the surface of a core which is a cause of a transmission loss by flowing a liquid polymer downwardly so as to be a core forming liquid polymer in an inner layer and a clad forming liquid polymer in an outer layer in order to form the core and the clad respectively, and by cross-linking the liquid polymer during flowing downwardly. CONSTITUTION:The core forming liquid polymer and the clad forming liquid polymer are fed to a coaxial nozzle 3 from storage tanks 1, 2 respectively and at the same time, are flowed down-wardly. The flowing liquid polymer is irradiated the suitable cross-linking source from at least one direction to form a cross-link of the liquid polymer. The radiation (for example, a alpha ray, a beta ray, a gamma ray and a X ray), an ultraviolet ray or a heat are used as the suitable cross-linking source. The preferable radiation is the beta ray, namely an accelated electron beam. The heating is carried out by an infra-red ray or a heater. |
