We investigate the fluorescence characteristics of a purely Ce-doped silica fiber and demonstrate broad-bandwidth fluorescence across the visible and near-infrared. The Ce-doped fiber is fabricated using standard modified chemical vapor deposition technology. Trace metal analysis by inductively coupled plasma mass spectrometry confirmed the purity of Ce-doping. The Ce valence state of 3+ was revealed by X-ray photoelectron spectroscopy. The optimum pump wavelength for the broadest luminescence from a fiber is scanned between 405 nm to 440 nm wavelength of diode lasers operating under continuous-wave regime. The strongest pump absorption is observed at the wavelength of 405 nm. Variation of pump power and fiber length results in the demonstration of broad-bandwidth fluorescence with spectral widths up to 301 nm (at -10 dB). The measured fluorescence spectra cover the wavelength range from ∼458 nm to ∼819 nm with spectral power densities of up to 2.4 nW/nm.
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Funding. Engineering and Physical Sciences Research Council (EP/R024898/1); H2020 Marie Skłodowska-Curie Actions (843801); Jane & Aatos Erkko Foundation, Business Finland (1464/31/2019); Academy of Finland (326406, 326461); Ministry of Science and Higher Education of the Russian Federation (AAAA-A19- 119012590263-7, AAAAA19-119011-690112-0, theme 0095-2019-006); Academy of Finland Flagship Programme, Photonics Research and Innovation (PREIN) (320165).