Novel optical polarization splitter in lithium niobate

Author

Lin, Ko-Chun ; Hsu, Wen-Hao ; Wang, Way-Seen

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

fYear

2003

fDate

12-14 Sept. 2003

Firstpage

288

Lastpage

291

Abstract

A tunable Y-branch Ni:LiNbO₃ polarization (mode) splitter with a ridged input arm is presented. The ridge is used to lower the tuning voltage and thus enhance the tuning flexibility of the polarized fields. To improve the confinement of Ni-indiffused waveguide, Zn and Ni are both diffused at the same time. To use the electro-optic modulation, the polarization splitter is implemented in a Z-cut Y-propagating LiNbO₃. Experimental results show that the tuning voltage can be reduced by a factor of about 1/3 with a ridge of height 2 μm. The measured extinction ratio is 21 dB for the transverse electric (TE) mode and 18 dB for the transverse magnetic (TM) mode.

Keywords

electro-optical modulation; light polarisation; lithium compounds; nickel; optical design techniques; optical fabrication; optical polarisers; optical waveguides; ridge waveguides; tuning; LiNbO₃:Ni; Ni-indiffused waveguide; Y-branch Ni:LiNbO₃ polarization splitter; electro-optic modulation; extinction ratio; ridged input arm; transverse electric mode; transverse magnetic mode; tuning voltage; Electric variables measurement; Electrooptic modulators; Extinction ratio; Lithium niobate; Optical polarization; Optical tuning; Optical waveguides; Tellurium; Voltage; Zinc;

fLanguage

English

Publisher

ieee

Conference_Titel

Optoelectronics, Proceedings of the Sixth Chinese Symposium

Print_ISBN

0-7803-7887-3

Type

conf

DOI

10.1109/COS.2003.1278226

Filename

1278226