Properties of Silica Based Optical Fibers Doped With an Ultra-High Ytterbium Concentration
Konstantin K. Bobkov, Egor K. Mikhailov, T.S. Zaushitsyna, A. A. Rybaltovsky, Svetlana S. Aleshkina, Mikhail Melkumov, Mikhail M. Bubnov, Denis S. Lipatov, Mikhail V. Yashkov, Alexey Abramov, A. A. Umnikov, A. N. Guryanov, Mikhail E. Likhachev
Abstract
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.