Long-Period Grating on Strip Ti : LiNbO$_{3}$ Waveguide Embedded in Planar Ti : LiNbO $_{3}$ Waveguide

A special structure of a strip Ti : LiNbO
₃
waveguide embedded in a planar Ti : LiNbO
₃
waveguide is proposed to fabricate a long-period waveguide grating (LPWG). Its applicability is demonstrated by fabricating a long-period grating on the waveguide surface using usual photoresist. We show that an LPWG device based on such a special structure is thermally stable.