TY JOUR TI INTEGRATED OPTICAL WAVEGUIDES BASED ON Si3N4 FILMS KW PIC KW phase grating KW silicon nitride on insulator. JO Infocommunications and Radio Technologies AU Kulinich, I.V. AU Somogonyants, A.A. AU Shesterikov, E.V. AU Mokhovikov, D.M. PY 2022 IS 5 PB Federal State Educational Institution of Higher Education Sevastopol State University