A.N. Yakimov1, A.R. Bestugin2, I.A. Kirshina3

1-3 Saint-Petersburg State University of Aerospace Instrumentation (Saint-Petersburg, Russia)

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

E-mail: physics@nntu.ru

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

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

S. A. Vorobiev – Master, Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev