Refractivity of P<sub>2</sub>O<sub>5</sub>-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> Glass in Optical Fibers
Mikhail E. Likhachev,
Tatiana S. Zaushitsyna,
Vitaliya A. Agakhanova,
Liudmila D. Iskhakova,
Svetlana S. Aleshkina,
Mikhail M. Bubnov,
Alexey S. Lobanov,
Denis S. Lipatov
Affiliations
Mikhail E. Likhachev
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center of the Russian Academy of Sciences, 119991 Moscow, Russia
Tatiana S. Zaushitsyna
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center of the Russian Academy of Sciences, 119991 Moscow, Russia
Vitaliya A. Agakhanova
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center of the Russian Academy of Sciences, 119991 Moscow, Russia
Liudmila D. Iskhakova
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center of the Russian Academy of Sciences, 119991 Moscow, Russia
Svetlana S. Aleshkina
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center of the Russian Academy of Sciences, 119991 Moscow, Russia
Mikhail M. Bubnov
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center of the Russian Academy of Sciences, 119991 Moscow, Russia
Alexey S. Lobanov
G.G. Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, 49 Tropinin St., 603951 Nizhny Novgorod, Russia
Denis S. Lipatov
G.G. Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, 49 Tropinin St., 603951 Nizhny Novgorod, Russia
A significant change in the refractive index profiles for the large mode area phosphoroaluminosilicate (PAS) core optical fibers was observed in comparison to that in preforms. This study shows that the refractive index of the PAS core can vary from negative (in preform) to positive (in fiber), and the difference in the refractive index between the core and preform can exceed a few thousand. By measuring a large set of fibers with different concentrations of P2O5 and Al2O3, we define the refractivity of each dopant (P2O5, Al2O3 and AlPO4 joint) after drawing fiber from the preform and discuss the possible origin of the observed refractive index variation.
