We experimentally investigated loss of multimode optical fibers (MMFs) drawn of thermally shaped optical fiber preforms (OFPs). Such preforms are typically used for fabrication of double clad active fibers. The investigation involved undoped shaped MMFs coated with a low refractive index polymer. The fibers were drawn of silica rod, prepared by collapsing a pure silica tube (Heraeus F300, OH content is 0.2 ppm) in the MCVD lathe. Background losses of undoped MMFs with inner cladding of various geometries shaped by CO₂ laser were measured via cut-back method. Losses of the shaped MMFs were compared to the loss of the circular and of the mechanically shaped MMF. Constraints, drawbacks and advantages of shaping the fiber preform using the CO₂ laser are discussed. Shaping OFPs with CO₂ beam provides advantages of quick polishing, smooth surface, and freeform shape. Results show that mechanical polishing technique leads to significant OH content elimination, which is expressed as reduced absorption peaks at wavelengths of 0.945 μm and 1.24 μm, which correspond to the third and second overtone, respectively. The average perimeter length of fibers cross section governs absorption at polymer-glass interface.

Date Published: 16 April 2019
PDF: 5 pages
Proc. SPIE 11029, Micro-structured and Specialty Optical Fibres VI, 1102909 (16 April 2019); doi: 10.1117/12.2520995

Published in SPIE Proceedings Vol. 11029:
Micro-structured and Specialty Optical Fibres VI
Kyriacos Kalli; Alexis Mendez; Pavel Peterka, Editor(s)