Source: https://www.osapublishing.org/ome/abstract.cfm?URI=ome-9-4-1815
Timestamp: 2019-04-20 06:41:36+00:00

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We report a reproducible fabrication process ensuring repeatable absorption and emission properties of bismuth (Bi) doped silica-glass optical fibers (BDFs) with single-mode operation above ∼800 nm. BDFs were fabricated through a modified chemical vapor deposition process in-line with the solution-doping technique. Lithium-germanosilicate, yttrium-germanosilicate, and yttrium-phosphosilicate glasses were used as hosts for Bi. Bi and other dopant concentrations were measured by EPMA. ∼0.07wt% of Bi content is obtained with a transparent core. The absorptive and emissive properties of BDFs in the VIS-NIR range (targeted onto 600-900 nm) were studied thoroughly. This study is oriented to the development of VIS/NIR lasers and amplifiers, using BDFs of this type.
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Fig. 1. BDFs RIPs (measured by fiber analyzer); inset zooms the core area of the fibers.
Fig. 2. Elemental distributions of dopants in preforms (measured by EPMA): (a) all elements; (b) Bi only.
Fig. 3. BDFs’ cross sectional images (measured by optical microscope): (a) BLGS (3.31 µm), (b) BYGS (5.24 µm), and (c) BYPS (4.42 µm).
Fig. 4. Transmission difference (straight to coiled positions) of fiber samples (a) BYGS and (b) BYPS, revealing spectral positions of cutoff wavelengths (∼830 and ∼630 nm, respectively).
Fig. 5. (a)Absorption spectra and (b) base attenuation spectra of BDFs.
Fig. 6. PL spectra obtained at different excitation wavelengths of: (a) BLGS, (b) BYGS, and (c) BYPS fibers. In all cases, launched excitation power is fixed to ∼4 mW. BDF lengths are provided in insets. The dashed areas indicate the spectral range of main interest for this study.
Fig. 8. Simulated bending loss for LP01 modes of BDFs with 30 cm bending diameter using Optifiber mode analysis software.

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