I. A. Vdovichenko - Ph.D. (Phys.-Math.), Associate Professor of Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev E-mail: physics@nntu.nnov.ru A. S. Raevskij - Dr.Sc. (Phys.-Math.), Professor, Head of Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev; Honored Scientist of RF S. B. Raevskij - Dr.Sc. (Eng.), Professor of Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev; Honored Scientist of RF

T. V. Kozhevnikova¹, V. A. Malakhov², A. S. Nechaev³, A. A. Nikitin4, A. S. Raevskij5, S. B. Raevskij6, A. Yu. Sedakov7, A. A. Titarenko8, A. S. Kuzyaev8

1–3, 5–8 Nizhny Novgorod State Technical University n.a. R.E. Alekseev (Nizhny Novgorod, Russia)

3, 4, 7–9 Branch of the Russian Federal Nuclear Center – All-Russian Research Institute of Experimental Physics «Measuring Systems Research Institute n.a. Yu.E. Sedakov» (Nizhny Novgorod, Russia)