US 11,866,360 B2
Method for producing a preform for producing a multicore fibre and also a preform and a multicore fibre
Wolfgang Haemmerle, Jena (DE); and Christian Schulze, Zoellnitz (DE)
Assigned to J-FIBER GMBH, Jena (DE)
Appl. No. 17/059,215
Filed by J-FIBER GMBH, Jena (DE)
PCT Filed May 15, 2019, PCT No. PCT/DE2019/200043
§ 371(c)(1), (2) Date Nov. 26, 2020,
PCT Pub. No. WO2019/228596, PCT Pub. Date Dec. 5, 2019.
Claims priority of application No. 10 2018 112 739.1 (DE), filed on May 28, 2018.
Prior Publication US 2021/0198139 A1, Jul. 1, 2021
Int. Cl. C03B 37/012 (2006.01); C03B 37/027 (2006.01)
CPC C03B 37/01222 (2013.01) [C03B 37/01234 (2013.01); C03B 37/027 (2013.01); C03B 2203/34 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for producing a preform for producing a multi-core fiber, the method comprising:
removing a first part-tube segment comprising a first part-tube segment cross-sectional area from a center of a receiving tube comprising a receiving tube internal diameter so that the receiving tube comprises a first core rod receiving cut-out formed as a remaining annular sector with two opposite edges;
axially introducing a central filling rod comprising a central filling rod external diameter into the receiving tube, the central filling rod external diameter being less than the receiving tube internal diameter so that the receiving tube contains the central filling rod;
inserting a first core rod comprising a first core rod cross-sectional area in a radial direction from outside into the first core rod receiving cut-out between the two opposite edges of the remaining annular sector so that the receiving tube contains the first core rod;
axially introducing the receiving tube containing the first core rod and the central filling rod into a jacketing tube so as to obtain a jacketing tube containing the receiving tube; and
fusing the jacketing tube containing the receiving tube to form the preform,
wherein,
the preform is at least one of fused and drawn to provide the multi-core fiber; and
the multi-core fiber is an optical waveguide.