Fabrication of Integrated-Optic Wavelength Demultiplexer by Double Proton Exchange

• Main Authors: Ma, Cheng-Ji, 馬正驥
• Other Authors: Wang, Tzyy-Jiann
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/24462509999506837895

碩士 === 國立臺北科技大學 === 光電技術研究所 === 92 === For the request of the increase of data transmission in the fiber optics communication, the development of new type wavelength demultiplexers is important to meet this request. Based on the mode sorting effect in integrated optics, a new 980/1550 Y-branch-type wavelength demultiplxer on LiNbO3 is successfully demonstrated by using double proton exchange method. In this study, we first design the waveguide structures of two output waveguides of Y-branch and select the fabrication parameter by theoretical calculations. The dispersion characteristics of the output waveguide can be tuned by adding an extra layer of high index and the performance of the proposed devices can be further improved. Comparing to other types of wavelength demultiplexers, Y-branch-type wavelength demultiplexer has the advantages of high fabrication tolerance and wide operational wavelength range. The proposed device structure has additional advantages of high input pump power, easy fabrication, low fabrication cost and can be integrated with Er-doped LiNbO3 devices because it uses only proton exchange method on LiNbO3. In the present fabrication condition, the extinction ratios of the device at wavelength of 980nm and band of 1550nm can reach over 18.5dB and 18.1dB, respectively.