Improved Design and Fabrication of Titanium Diffused Lithium Niobate Multimode Interference Power Splitters

• Main Authors: Yi-Chen Lin, 林奕辰
• Other Authors: 王維新
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/00784274268725144239

碩士 === 國立臺灣大學 === 電子工程學研究所 === 99 === Two types of improved 1×4 titanium diffused lithium niobate multimode interference (MMI) power splitters are proposed. The first MMI has an interference region of two stages adjusted to enhance an improvement factor. The second one has an interference region with deposited electrodes. The first type MMI power splitter is obtained by an appropriate cutting of the interference region. For performance evaluation of proposed device, an improvement factor is proposed. The two-stage MMI power splitter has a higher transmission of 80.5% and a shorter coupling length of 2250μm. The improvement factor is increased by 16%. For the second type of MMI power splitter, a voltage varying from 0 to 60V is applied on the first one-third of the interference region for electro-optic modulation. The results show when the coupling length is 2250μm, transmission can be increased by 5.4%, and the power ratio of inner output waveguide and outer output waveguide is varying from 0.74 to 1.58, which can be used as tunable power splitter for practical application.