Properties of Silica Based Optical Fibers Doped With an Ultra-High Ytterbium Concentration

Silica-based optical fibers with an ultra-high Yb concentration were systematically studied. Three the most commonly used in industry glass matrixes for active fiber core were investigated: aluminosilicate, phosphosilicate and aluminophosphosilicate. For all the glass hosts optical fibers doped with a record high concentration of Yb in a glass core were fabricated utilizing an all-gas-phase deposition based on MCVD technology. The factors limiting increase of Yb content in glasses and fibers were revealed. For the first time it was shown that highly Yb-doped fibers could nearly completely lose their active properties and the most probable reason for that is concentration quenching of luminescence.

Automated summary

This study systematically investigates silica-based optical fibers with an ultra-high Yb concentration. The factors limiting the increase of Yb content in glasses and fibers are revealed, and it is shown for the first time that highly Yb-doped fibers can nearly completely lose their active properties due to concentration quenching of luminescence.