Title :
A TE-TM mode splitter on lithium niobate using Ti, Ni, and MgO diffusions
Author :
Wei, Pei-Kuen ; Wang, Way-Seen
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
A new TE-TM mode splitter with an asymmetric Y-junction structure fabricated by diffusing different materials into Y-cut lithium niobate is presented. Randomly polarized light launched into a titanium indiffused waveguide is split into TE and TM modes by two different single-polarization waveguides. The ordinary-polarized waveguide is made by nickel indiffusion and the extraordinary-polarized waveguide by magnesium-oxide induced lithium outdiffusion. The measured extinction ratios are greater than 20 dB for both TE and TM modes. The devices operate over a wide wavelength range and have a large fabrication tolerance.<>
Keywords :
diffusion in solids; integrated optics; light polarisation; lithium compounds; magnesium compounds; nickel; optical communication equipment; optical workshop techniques; titanium; LiNbO/sub 3/; LiNbO/sub 3/:MgO,Ti,Ni; MgO diffusions; Ni diffusions; TE-TM mode splitter; Ti diffusions; Y-cut; asymmetric Y-junction structure; extinction ratios; extraordinary-polarized waveguide; indiffused waveguide; large fabrication tolerance; ordinary-polarized waveguide; outdiffusion; randomly polarized light; single-polarization waveguides; wavelength range; Extinction ratio; Lithium niobate; Nickel; Optical device fabrication; Optical fiber polarization; Optical fiber sensors; Optical sensors; Optical waveguides; Tellurium; Titanium;
Journal_Title :
Photonics Technology Letters, IEEE
