| 摘要 |
PURPOSE:To contrive improvement of manufacturing yield rate, by providing a interface layer having smoothly varying refractive index between core and mold and gradually increasing fluorine content to outward, in a light transmitter of single mode type. CONSTITUTION:A quartz fine particles aggregate (suite 4) is formed through hydrolysis reaction in an oxygen-hydrogen flame in VAD method, dehydrated and vitrified to transparent glass in a heating furnace 5 and a rod is obtained. Next, the suite is accumulated on a clad part of the rod by OVD method. At the time, SiCl4 and POCl3 are cast from a central nozzle of tetralayer tube 10 and Si, H2 and Ar, O2 are respectively fed from other nozzles. Thus, an interface layer 3 is smoothly formed between core 1 and clad 2 and fluorine content in the interface layer 3 is gradually increased to outward. A generation of interface defect at line drawing, thus a manufacturing yield rate is improved. |
