1. B. I. Stepanov Institute of PhysicsNational Academy of Sciences of Belarus68 Nezavisimosti Avenue Minsk 220072 Belarus
2. ITMO University 49 Kronverksky Prospekt St. Petersburg 197101 Russia
3. Saint Petersburg Electrotechnical University “LETI” (ETU)5 Prof. Popova Street St. Petersburg 197376 Russia
4. Ulyanovsk State University42 Lev Tolstoy Street Ulyanovsk 432017 Russia