Title :
TE-TM mode splitter with heterogeneously coupled Ti-diffused and Ni-diffused waveguides on Z-cut lithium niobate
Author :
Twu, Ruey-Ching ; Huang, Chin-Chili ; Wang, Way-Seen
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
2/3/2000 12:00:00 AM
Abstract :
A coupling type mode splitter with an extraordinary polarisation and a random polarisation waveguide made by Ni and Ti indiffusion, respectively, on a Z-cut LiNbO3 substrate is described for the first time. With optimised process parameters: a very small TM mode profile mismatch is obtained due to the similar characteristics of the Ti- and Ni-diffused waveguides. The measured extinction ratios of the TE and TM modes at 1.55 μm wavelength are >22 dB
Keywords :
diffusion; integrated optics; lithium compounds; optical beam splitters; optical communication equipment; optical waveguides; optimisation; substrates; 1.55 mum; LiNbO3; Ni-diffused waveguides; TE modes; TE-TM mode splitter; TM modes; Z-cut LiNbO3 substrate; heterogeneously coupled Ti-diffused waveguides; measured extinction ratios; optimised process parameters; small TM mode profile mismatch;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20000224
