Title :
Improved electrooptic modulator with ridge structure in X-cut LiNbO 3
Author :
Chang, Shih-Jung ; Tsai, Ching-Long ; Lin, Yih-Bin ; Liu, Ju-Feng ; Wang, Way-Seen
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
5/1/1999 12:00:00 AM
Abstract :
A ridge-type Mach-Zehnder modulator on X-cut LiNbO3 is fabricated by wet etching with proton-exchange pretreatment. Experimental results show that, with the assistance of the ridge structure, the drive voltage of the proposed modulator is reduced. The enhancement of overlap integral caused by ridge structure is also validated from numerical simulation. Moreover, an improved design to further reduce the drive voltage of the ridge-type Mach-Zehnder is proposed by a proper placement of waveguide relative to the electrode
Keywords :
electro-optical modulation; electrodes; etching; integrated optics; lithium compounds; optical fabrication; optical waveguides; ridge waveguides; LiNbO3; X-cut LiNbO3; drive voltage; electrode; electrooptic modulator; numerical simulation; optical waveguide; overlap integral; proton-exchange pretreatment; ridge structure; ridge-type Mach-Zehnder modulator; wet etching optical fabrication; Dry etching; Electrodes; Electrooptic modulators; Electrooptical waveguides; Optical modulation; Optical waveguide theory; Optical waveguides; Voltage; Waveguide discontinuities; Wet etching;
Journal_Title :
Lightwave Technology, Journal of
