公开(公告)号：US20140112620A1

公开(公告)日：2014-04-24

申请号：US14113828

申请日：2012-04-03

Applicant: Yuto Yamshita ,  Etsuo Ogino ,  Keiichi Sasaki

Inventor： Yuto Yamshita ,  Etsuo Ogino ,  Keiichi Sasaki

IPC: G02B6/32

CPC classification number: G02B6/32 ,  G02B6/4206 ,  G02B6/425

Abstract: A photo module which measures a signal strength in a transmission path, and this technique collects a signal light, guided to a photo module, on a light receiving element without increasing the number of manufacturing processes and the cost and, at the same time, prevents reflected light returned from the photo module from entering inside the transmission path again.The photo module is provided with an incident light fiber guiding incident light, a gradient index lens having an optical axis different from the incident light fiber, having a period length larger than a ¼ period length and smaller than a ½ period length with respect to the wavelength of the incident light, joined to the incident light fiber on a surface forming a finite angle with a surface vertical to the optical axis, and having, as a light exit surface of emitting light, a surface substantially vertical to the optical axis, and a light receiving element disposed at a position where the emitting light is collected and measuring the strength of the emitting light.

Abstract translation: 测量传输路径中的信号强度的照片模块，并且该技术在不增加制造工艺数量和成本的情况下收集被引导到光接收元件上的照相模块的信号光，并且同时防止 从照相模块返回的反射光再次进入传输路径内。 光模块设置有引入入射光的入射光纤，具有不同于入射光纤的光轴的渐变折射率透镜，其周期长度大于1/4周期长度，并且小于相对于 入射光的波长，在与光轴垂直的表面形成有限角度的表面上接合入射光纤，并且具有作为发光的光出射面，基本上垂直于光轴的表面，以及 设置在收集发光的位置处的光接收元件，并测量发光的强度。