I. N. Danilov – Ph.D. (Eng.), Senior Research Scientist, Branch FSUE RFNC VNIIEF «Measuring System Research Institute n.a. Yu.Ye. Sedakov» (Nizhny Novgorod) E-mail: danilovn@yandex.ru

V. K. Maistrenko – Ph.D. (Eng.), Associate Professor of Department of Physics and Technology of Optical Communication,

Nizhny Novgorod State Technical University n.a. R.E. Alekseev

N. A. Novoselova – Ph.D. (Eng.), Associate Professor of Department of Physics and Technology of Optical Communication,

Nizhny Novgorod State Technical University n.a. R.E. Alekseev

S. B. Raevskij – Honored Scientist of RF, Dr.Sc. (Eng.), Professor of Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev