Polarization rotating device

A polarization rotating device (500), comprising a waveguide (WG1) formed of a crystalline material layer (MAT1), the waveguide (WG1) comprising: - an input portion (IN1), - a first mode evolution portion (TAP1) to receive TM polarized light from the input portion (IN1), and to transform the received TM polarized light into light of a tilted polarization mode (EVO) by mode evolution, - a second mode evolution portion (TAP2) to receive the light of the tilted polarization mode (EVO) from the first mode evolution portion (TAP1), and to transform the received light of the tilted polarization mode (EVO) into TE polarized light by mode evolution, - an output portion (OUT1) to output the TE polarized light received from the second mode evolution portion (TAP2), wherein the first mode evolution portion (TAP1) comprises a first tapered inclined facet (FA1), which widens up, and which defines polygonal cross-sectional shapes together with horizontal and vertical surfaces (TOP1, BOT1, SRF1A, SRF1B) of the first mode evolution portion (TAP1), wherein the second mode evolution portion (TAP2) comprises a second tapered inclined facet (FA2), which narrows down, and which defines polygonal cross-sectional shapes together with horizontal and vertical surfaces (TOP1, BOT1, SRF2A, SRF2B) of the second mode evolution portion (TAP2), wherein the expanding tapered inclined facet (FA1) and the converging tapered inclined facet (FA2) are portions of the same inclined crystal plane (FACE1) of the crystalline material layer (MAT1).

Patent family as of 16.7.2026
FI131637 B, FI20235214 A, US2026202679 AA, WO24175832 A1