E. A. Mikhalitsyn - Post-graduate Student of Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev; Research Engineer 3rd cat., Scientific-Research Institute of Measuring Systems n.a. Yu.E. Sedakov. E-mail: mihalitsynea@gmail.com A. S. Raevsky - 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. E-mail: raevsky@nntu.nnov.ru A. Yu. Sedakov - Dr.Sc. (Eng.), Associate Professor, Professor of Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev; Director of Scientific-Research Institute of Measuring Systems n.a. Yu.E. Sedakov. E-mail: niiis@niiis.nnov.ru