Title :
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
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;
Conference_Titel :
Optoelectronics, Proceedings of the Sixth Chinese Symposium
Print_ISBN :
0-7803-7887-3
DOI :
10.1109/COS.2003.1278226
