Yu. G. Belov – Dr.Sc. (Eng.), Professor of Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev

E-mail: bel266@nntu.ru

I. A. Nefed’ev – Senior Lecturer, Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev

E-mail: ra3tvj@mail.ru

A. I. Pikhtelev – Dr.Sc. (Eng.), Professor of Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev

E-mail: physics@nntu.ru

N. A. Pikhtelev – Ph.D. (Eng.), Senior Research Scientist, FRPC “Measuring System Research Institute n.a. Yu.Ye. Sedakov” (Nizhny Novgorod)

E-mail: picnic3@yandex.ru