Title :
Fabrication of LiTaO3 optical waveguides by Ni diffusion below the Curie temperature
Author :
Wei-Lin Chen ; Der-Jung Chen ; Way-Seen Wang
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
Using Ni diffusion into LiTaO3 below the Curie temperature for the fabrication of optical waveguides was presented for the first lime. Ordinary and extraordinary polarization waveguide modes were obtained. The index distribution profiles of both modes were measured by a prism coupler. Loss in planar waveguides at 0.6328 μm is 0.7/spl plusmn/0.1 dB/cm for the ordinary mode and 1.3/spl plusmn/0.2 dB/cm for the extraordinary mode. Moreover, a Mach-Zehnder interferometer was fabricated by this method for electrooptic characterization. The measured half-wave voltage is 5.5 V and the extinction ratio is greater than 29 dB.
Keywords :
Mach-Zehnder interferometers; birefringence; diffusion; electro-optical devices; lithium compounds; nickel; optical fabrication; optical losses; optical planar waveguides; refractive index; 0.6328 micron; 5.5 V; Curie temperature; LiTaO/sub 3/ optical waveguides; LiTaO/sub 3/:Ni; Mach-Zehnder interferometer; Ni diffusion; electrooptic characterization; extinction ratio; extraordinary polarization modes; fabrication; half-wave voltage; index distribution profiles; loss; ordinary polarization modes; planar waveguides; prism coupler; Extinction ratio; Optical device fabrication; Optical interferometry; Optical losses; Optical planar waveguides; Optical polarization; Optical waveguides; Planar waveguides; Temperature; Voltage measurement;
Journal_Title :
Photonics Technology Letters, IEEE
