Abstract

We analyze the origins of the luminescence in germania–silica fibers with high germanium concentration (about 30 mol.% ${\mathrm{GeO}}_2$) in the region of 1–2 μm with a laser pump at the wavelength 532 nm. We show that such fibers demonstrate the high level of luminescence which unlikely allows the observation of photon triplets, generated in a third-order spontaneous parametric downconversion process in such fibers. The only efficient approach to the luminescence reduction is the hydrogen saturation of fiber samples; however, even in this case, the level of residual luminescence is still too high for three-photon registration.

© 2017 Optical Society of America

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