METHOD FOR PRODUCING A MICROSTRUCTURED OPTICAL FIBER AND FIBER OBTAINED ACCORDING TO THE METHOD

摘要

Method and preform for producing a microstructured optical fiber and fiber obtained according to the method The present invention relates to a method for producing a microstructured optical fiber, wherein a plurality of glass capillaries are arranged inside the cladding-tube inner bore around a core region such that the capillary longitudinal axes extend in parallel with the cladding-tube longitudinal axis, and the assembly of cladding tube and capillaries is elongated into the microstructured optical fiber or into a preform from which the microstructured optical fiber is subsequently drawn. Starting from the fabrication of microstructured optical fibers with a low content of impurities, particularly to permit a low content of hydroxyl groups, it is suggested according to the invention that prior to elongation the assembly should be subjected to a cleaning treatment comprising gas phase etching.