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1. 发明授权

US5446816A Optical fiber having a lens formed at an end thereof 失效
标题翻译：具有在其端部形成的透镜的光纤
公开(公告)号：US5446816A
公开(公告)日：1995-08-29
申请号：US283959
申请日：1994-08-01
申请人： Kazuo Shiraishi , Kazuhito Matsumura , Isamu Oishi , Katsuo Ebine
发明人： Kazuo Shiraishi , Kazuhito Matsumura , Isamu Oishi , Katsuo Ebine
IPC分类号： G02B6/02 , G02B6/255 , G02B6/32 , G02B6/42
CPC分类号： G02B6/322 , G02B6/2552 , G02B6/4203
摘要： An optical fiber having a lens formed at an end thereof comprises a fiber body including a core and a cladding, and an incident light guide portion having a uniform refractive index and integrally formed at an end portion of the fiber body, wherein the incident light guide portion has a convex surface, and the core has a distal end located within the incident light guide portion at a position close to a focal point of the incident light guide portion. When the incident light guide portion is arranged in alignment with a light source such that an extremity of the convex surface of the incident light guide portion faces a light-emitting surface of the light source, assuming that an X-Y coordinate system is established wherein the X axis coincides with the optical axis of the fiber body and the Y axis coincides with a radius direction of the fiber body, the relationship expressed by the following equation is fulfilled: ##EQU1## where coordinates of the extremity of the convex surface of the incident light guide portion are (0, 0), coordinates of the light-emitting surface of the light source are (-k, 0), coordinates of the distal end of the core are (L, 0), coordinates of an incident point at which light from the light-emitting surface of the light source falls upon the convex surface of the incident light guide portion are (z, r), and the refractive index of the incident light guide portion is n. Accordingly, no phase difference of laser beams occurs when the optical fiber is connected to a semiconductor laser, making it possible to provide a high coupling efficiency optical fiber.
摘要翻译：具有在其端部形成的透镜的光纤包括具有芯和包层的纤维体和具有均匀折射率并且一体地形成在纤维体的端部的入射光导部，其中入射光导所述芯具有位于所述入射光导部内的远端，所述远端位于所述入射光导部的焦点附近的位置。当入射光导部分与光源对准地布置，使得入射光导部分的凸表面的末端面向光源的发光表面时，假设建立XY坐标系，其中X 轴与光纤体的光轴重合，Y轴与纤维体的半径方向一致，满足下式所表示的关系：入射光的凸面的末端的坐标引导部分为（0,0），光源的发光面的坐标为（-k，0），芯的前端的坐标为（L，0），入射点的坐标为来自入射光导部的凸面的光源的发光面的光为（z，r），入射导光部的折射率为n。因此，当光纤连接到半导体激光器时，不会发生激光束的相位差，使得可以提供高耦合效率的光纤。

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