| 摘要 |
PURPOSE:To obtain optical fibers having high efficiency of optical coupling, by making the optical coupling end to a cone so as to be gradually finer at its end by forming as well a round top part having a larger diameter than a core diameter integrally with the same material as the core. CONSTITUTION:The top end part of optical fibers 8 is processed to a cone by a mechanical grinding and is processed to a round top so that the carvature (a)= about 5mum by heating intensively by a H2 burner 10 (or arc discharge). Quartz etc. of the same material as a core are stuck on the top end of the core 1 by melting to form a round top part 11 having the larger diameter than that of the core 1. The part 11 is heated by the burner 10 etc. to form a radius of carvature of the top end to about 7-12mum. By making the radius of carvature of the top end at the round top part 11 to 7-12mum, the light receiving surface is made to be larger than the core diameter, and therefore an efficiency of optical coupling is improved greatly by 35-40% as compared with 10-20% in the past. |
