| 摘要 |
Producing preform (1) comprising a core element and several sub-elements (5) extending along the preform, comprises forming a bundle (6) of the sub-elements and the core element, which is twisted to a predetermined angle around the longitudinal axis of the bundle, and melting the twisted bundle by heating it above the transformation point of its materials, at least partially such that the material-free spaces between the sub-elements, between the sub-elements and the core element, and between the sub-elements and a shell at least partially disappears. Producing preform (1) comprising a core element and several sub-elements (5) extending along the preform, comprises forming a bundle (6) of the sub-elements and the core element, which is twisted to a predetermined angle around the longitudinal axis of the bundle, where the pattern forming the cross-sections of sub-elements and the cross-sections of the core element is maintained along the preform, and melting the twisted bundle by heating it above the transformation point of its materials, at least partially such that the material-free spaces between the sub-elements, between the sub-elements and the core element, and between the sub-elements and a shell at least partially disappears. An independent claim is also included for the preform for drawing a microstructured optical fiber into a drawing device, in which a preform end is heated and the optical fiber is removed from the heated preform end, comprising a core area (2) and several substructure elements (3), which extend along the preform. The substructure elements are arranged helically around the longitudinal axis of the core area, where the pattern, which is viewed in cross-section of the preform, forming the cross-section of the substructure elements, is respectively same as the rotation caused at the helical arrangement of the substructure elements. |
