Patent ID: 9069120
Filing Date: 2015-06-30
Classification: C03B,G02B

Abstract:
1. A method for manufacturing a preform for drawing a microstructured optical fiber, comprising the steps of: arranging a core element and multiple sub-elements to form a bundle, said bundle having a longitudinal axis in collinear relationship with the preform; twisting the bundle by a specified angle about the longitudinal axis, wherein a pattern defined by a cross section of the sub-elements and by a cross section of the core element remains preserved along a length of the preform; inserting the bundle into a casing; and fusing the casing and the bundle at least partially together by heating the casing, the core element and the sub elements above a transformation point of a respective material of which the casing, the core element and the sub-elements are made, so as to at least partially eliminate empty cavities between the sub-elements, between the sub-elements and the core element, and between the sub-elements and the casing.