| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a double core optical fiber allowing transmission of single mode signal light and multimode signal light and allowing a reduction of multimode transmission of signal light guided through a core even when the optical fiber is bent. <P>SOLUTION: The double core optical fiber includes the core 111 provided at the center to serve as a first material for single mode transmission, and a first clad 227 serving as a second material, a second clad 231 serving as a third material, and a third clad 241 made of polymer resin, sequentially provided on the outside of the core 111. The first clad 227 is formed divided in a region 223 including the core 111 and a region 225 not including the core 111. The region 225 includes a part of an outer peripheral part (a surface part) of the first clad 227. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
