US 12,276,830 B2
Preforms for speckle-free output optical fibers having structured silica sections, methods of such preform manufacture, and improved speckle-free output optical fibers
Wolfgang Neuberger, Vienna (AT); and Andrey Grischenko, Riga (LV)
Assigned to biolitec Holding GmbH & Co KG, Vienna (AT)
Appl. No. 17/802,493
Filed by biolitec Unternehmensbeteiligungs III AG, Vienna (AT)
PCT Filed Feb. 25, 2021, PCT No. PCT/EP2021/054740
§ 371(c)(1), (2) Date Aug. 25, 2022,
PCT Pub. No. WO2021/170748, PCT Pub. Date Sep. 2, 2021.
Claims priority of provisional application 62/981,151, filed on Feb. 25, 2020.
Prior Publication US 2023/0104707 A1, Apr. 6, 2023
Int. Cl. G02B 6/036 (2006.01); C03B 37/014 (2006.01); G02B 6/02 (2006.01); B08B 7/00 (2006.01); G02B 6/14 (2006.01)
CPC G02B 6/03688 (2013.01) [C03B 37/01426 (2013.01); G02B 6/023 (2013.01); B08B 7/0042 (2013.01); C03B 2201/34 (2013.01); G02B 6/14 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A preform for speckle-free output optical fibers, drawn from it, whose cross-sectional structure comprises: a complex core structure and a reflective layer, the complex core structure comprising a circular inner core with a refractive index and a circular outer core with the same refractive index as the inner core, the inner core surrounded by a structured circular area with an average refractive index lower than the refractive index of the inner core and the outer core.