| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a bandgap MOF which has a comparatively large core dimension to reduce loss of an air core fiber and suppress a HOM (higher order modes). <P>SOLUTION: An optical fiber comprises core and cladding regions configured to guide the propagation of light (or radiation) in the core region. The cladding region includes a periodic structure configured to produce light guided by bandgap confinement. In order to suppress higher order modes in the core region, the cladding region includes at least one perturbation region configured so that a mode of the cladding region is resonant with a HOM of the core region. In a preferred embodiment of this invention, the perturbation region is configured so that the fundamental mode of the cladding region is resonant with the HOM of the core region. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
