Title :
TE-TM mode splitter using directional coupling between heterogeneous waveguides in LiNbO3
Author :
Maruyama, Hideki ; Haruna, Masamitsu ; Nishihara, Hiroshi
Author_Institution :
Mater. & Component Res. Lab., Kyushu Matsushita Electr. Co. Ltd., Japan
fDate :
7/1/1995 12:00:00 AM
Abstract :
We propose and demonstrate a novel passive TE-TM mode splitter using an anomalous directional coupler consisting of Ti-diffused and annealed, proton-exchanged waveguides in LiNbO3. The extraordinary wave was successfully power-transferred to the cross output with the extinction ratio of >12 dB in both X- and Z-cut LiNbO 3. The ordinary wave experienced no power transfer without any excess loss due to side-way diffusion of Ti or proton. The coupler length was only <1 mm at λ=0.813 mm, which was short enough for optical integration
Keywords :
annealing; diffusion; integrated optics; lithium compounds; optical directional couplers; optical elements; optical losses; optical waveguides; 0.813 nm; LiNbO3; TE-TM mode splitter; Ti-diffused; X-cut; Z-cut; annealed; anomalous directional coupler; coupler length; cross output; directional coupling; excess loss; extinction ratio; extraordinary wave; heterogeneous waveguides; optical integration; ordinary wave; passive TE-TM mode splitter; power-transferred; proton-exchanged waveguides; side-way diffusion; Annealing; Directional couplers; Extinction ratio; Fabrication; Optical coupling; Optical losses; Optical scattering; Optical waveguides; Protons; Tellurium;
Journal_Title :
Lightwave Technology, Journal of
