US 12,110,248 B2
Method of fiber production
Christian Jakobsen, Virum (DK); Harald Roager Simonsen, Lejre (DK); Jens Kristian Lyngsøe, Hornbæk (DK); and Mattia Michieletto, Copenhagen (DK)
Assigned to NKT Photonics A/S, Birkerød (DK)
Appl. No. 16/096,878
Filed by NKT Photonics A/S, Birkerød (DK)
PCT Filed Apr. 27, 2017, PCT No. PCT/DK2017/050127
§ 371(c)(1), (2) Date Oct. 26, 2018,
PCT Pub. No. WO2017/186246, PCT Pub. Date Nov. 2, 2017.
Claims priority of application No. PA 2016 70262 (DK), filed on Apr. 27, 2016; and application No. PA 2016 70263 (DK), filed on Apr. 27, 2016.
Prior Publication US 2019/0135679 A1, May 9, 2019
Int. Cl. C03B 37/012 (2006.01); C03B 37/025 (2006.01); C03B 37/027 (2006.01); G02B 6/02 (2006.01)
CPC C03B 37/0122 (2013.01) [C03B 37/0253 (2013.01); C03B 37/02781 (2013.01); G02B 6/02295 (2013.01); G02B 6/02314 (2013.01); C03B 2203/16 (2013.01); C03B 2203/42 (2013.01); C03B 2205/10 (2013.01); C03B 2205/12 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of producing a hollow core microstructured optical fiber, the method comprising:
providing a preform with a center axis, a length, a first end, and a second end, wherein the preform comprises a plurality of hollow tubes;
inserting a first end of a pressure tube into each of a sub-set of the plurality of hollow tubes of the preform at the first end of the preform; and
drawing the preform to the hollow core microstructured optical fiber, said drawing comprising subjecting the sub-set of the plurality of hollow tubes of the preform to a controlled pressure via the pressure tubes,
wherein a pressure tube length section comprising the first end of each said respective pressure tube is inserted into each hollow tube of the sub-set of the plurality of hollow tubes of said preform, wherein the hollow core microstructured optical fiber comprises at least a part of the pressure tube length section.