基于Ti扩散铌酸锂偏振分束器的研制
Integrated optical TE/TM mode splitter using Ti∶LiNbO3 technology
摘要
对定向耦合型偏振分束器的原理进行了分析。设计了一种零间距定向耦合器,在空间上实现TE/TM模式分束;用BPM软件对所设计的器件进行仿真模拟,对于TE/TM模的消光比分别可以达到21.2dB和19.5dB;该器件在X切Y传的LiNbO3晶片上采用Ti扩散技术制作完成。实验样品消光比测试结果TE/TM模分别为11.5dB和19.1dB,对于消光比不够理想的原因进行了初步的分析。
Abstract
The TE/TM mode splitter using directional coupler was proposed. The TE/TM mode polarization was separated by the designed directional coupler with zero spacing in the space,which was simulated by using Rsoft's BPM software. The simulated extinction ratio of TE/TM mode is reached 21.2 dB and 19.5 dB respectively. The Ti diffused technology is adopted to fabricate the device on the X cut Y propagation LiNbO3 slice. The measured extinction ratio of TE/TM mode is 11.5dB and 19.1dB respectively. The primary reasons are discussed.
参考文献
[1] Cheung K W Acousto-optic tunable filters in narrowband WDM networks: system issues and network applications[J]. IEEE journal on selected areas in communications,1990,8(6):1015-1025.
[2] 秦秉坤,孙雨南.介质导波光学[M].北京:兵器工业出版社,1987
[3] 蔡伯荣.集成光学[M] 成都:电子科技大学出版社,1990.
[4] 胡鸿章,等钛扩散铌酸锂条形波导的有效折射率截面随扩散系数的变化[J].中国激光1996,23(4):333-337
[5] Fouchet S. ,Carenco A. Wavelength dispersion of Ti induced refractive index change in LiNbO3 as a function of diffusion parameters[J]. Journal of Lightwave Technology,1987,LT-5 (5):700-708.
崔建民, 冯立辉, 吕敏, 郭建, 孙雨南, 崔芳. 基于Ti扩散铌酸锂偏振分束器的研制[J]. 光学技术, 2007, 33(1): 0092. CUI Jan-min, FENG Li-hui, LV Min, GUO Jan, SUN Yu-nan, CUI Fang. Integrated optical TE/TM mode splitter using Ti∶LiNbO3 technology[J]. Optical Technique, 2007, 33(1): 0092.