| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a directional coupler using optical fibers, capable of manufacturing a coupler having a desired performance including a case using a photonic crystal fiber and a photonic bandgap fiber that have a structure enclosing a core periphery with holes. <P>SOLUTION: This method for manufacturing a directional coupler comprising two optical fibers 10 includes: a polishing step for removing parts of the respective side faces of the two optical fibers by polishing and forming removed surfaces 15; and a joining step for joining them together, with the removed surfaces facing each other. The polishing step comprises: propagating reference light in the core 11 of the optical fiber, polishing it while measuring an output light intensity of the reference light; and, when the output light intensity is attenuated to a predetermined intensity, finishing the polishing. <P>COPYRIGHT: (C)2012,JPO&INPIT |
