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The optical properties of fibres with aluminophosphosilicate (APS) glass cores have been studied at Al 2 O 3 and P 2 O 5 concentrations varied independently from 0 to 20%, and the ranges of dopant concentrations that ensure an optical loss level acceptable for the fabrication of active fibres have been established. The origin of the increased losses observed previously in APS fibres containing excess phosphorus pentoxide has been identified, and the contamination source responsible for such losses in our fibres has been eliminated.
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Bubnov et al. (2009) studied this question.
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