公开(公告)号：US20190135679A1

公开(公告)日：2019-05-09

申请号：US16096878

申请日：2017-04-27

Applicant: NKT Photonics A/S

Inventor： Christian JAKOBSEN ,  Harald Roager SIMONSEN ,  Jens Kristian LYNGSØE ,  Mattia MICHIELETTO

IPC: C03B37/012 ,  C03B37/027 ,  C03B37/025 ,  G02B6/02

Abstract: A method of producing a microstructured optical fiber is disclosed. The method includes providing a preform and drawing the preform. The preform has a center axis, a length and a first end and a second end and has at least one longitudinal hole extending lengthwise. The method includes inserting a first end of a pressure tube into the hole of the preform at the first end of the preform and subjecting the hole of the preform to a controlled pressure via the pressure tube during the drawing.

公开(公告)号：US20210323856A1

公开(公告)日：2021-10-21

申请号：US17356620

申请日：2021-06-24

Applicant: NKT Photonics A/S

Inventor： Harald Roager SIMONSEN ,  Christian JAKOBSEN

IPC: C03B37/012 ,  C03B37/027 ,  G02B6/032 ,  C03B37/025

Abstract: A preform element, its production, and fiber production methods from preform assemblies. The preform element has a length and a center axis along its length, a first and second end defined by its length and an outer preform element surface. The preform element includes a plurality of longitudinal structures disposed to form longitudinal hole(s) in a background material. At least one slot extending from its outer preform element surface and intersecting at least one of the longitudinal holes, wherein the at least one slot does not fully intersect the preform element. The preform element may be a preform center element or a preform ring element and may be assembled to a form part of a preform assembly for an optical fiber.