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The fabrication of Ce-doped fibers (CeDFs) employing drawing-tower method with rod-in-tube technique is demonstrated. The CeDFs exhibited a 160-nm broadband fluorescence spectrum which provides the potential for utilizing as broadband source for ultrahigh resolution OCT.
Broadband fluorescence enhancement in Cr-doped fibers (CDFs) fabricated by drawing-tower integrated powder-in-tube with redrawing technique is proposed and demonstrated. The CDFs after heat treatment exhibited Cr+4 emission enhancement with spectral density of 200 pW/nm which was identified as the formation of α-Mg2SiO4 nanocrystalline structures in the core, observed by HRTEM.
A few-mode Cr-doped crystalline core fiber (FMCDCCF) cladded by high-index glass is demonstrated. The FMCDCCF exhibited a V-value below four at 1400nm to provide five few-mode characteristics for possibility use in broadband fiber amplifiers.
The CDFs employing drawing-tower integrated non-silica powder-in-tube with redrawing technique is proposed. A reduction of transmission loss of 0.27 dB/cm at 1550-nm and a core non-circularity of less than 3% for the CDFs are achieved.
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