Herstellungsverfahren einer photonischen Kristallfaser

摘要

In a method of producing a photonic crystal fibre, a preform that includes holes is formed and the preform is drawn into a fibre. The method comprises the step of applying a pressure differential to certain of the holes to control changes in the fibre structure during the draw. A stack of a regular array of capillaries (300) are placed inside a thick-walled silica glass tube (310). The silica glass tube (310) forms part of the fibre after drawing, serving as a jacket to provide mechanical strength. During the drawing process the inside of the tube (310) is evacuated by sealing it within an evacuatable structure while the inside of some or all of the capillaries (300) are kept at a different and higher pressure.