PMMA脊形光波导的设计与场分析  

Design and Field Analysis of PMMA Rib Optical Waveguides

作　　者：周建华[1] 游佰强[1] 林静[2] 

机构地区：[1]厦门大学电子工程系,福建厦门361005 [2]厦门大学机电工程系,福建厦门361005

出　　处：《光电子技术》2006年第4期250-254,共5页Optoelectronic Technology

基　　金：高校骨干教师项目资金;福建省青年科技人才创新项目资金(2001J024)

摘　　要：利用有效折射率法(E IM)理论设计了有机聚合物脊形光波导结构,并分析光波导中传输的模式场,确定出光波导结构的适宜尺寸范围。光波导结构中分别选用PMMA(聚甲基丙烯酸甲酯)与PDM S(聚二甲基硅氧烷)作为波导层与包层的材料,用光漂白法来实现脊形波导结构。首先利用E IM法分析脊形波导区的宽度与高度之间的关系对归一化色散曲线的影响,以及波导层与包层的折射率匹配的影响,然后又通过分析波导区传输的基模场来讨论传输的损耗问题。研究发现波导结构的脊宽与脊高之比w/d越大,其有效折射率neff越大,而此结构尺寸又需约束在一定范围内,否则将造成很大的传输损耗。The structure of the polymer rib optical waveguide is designed by using effective index method （EIM）, and the mode field distribution in these waveguides is analyzed to determine the suitable structural size range. For this rib waveguide realized by photo-induced bleaching, two kinds of polymer materials, PMMA and PDMS, are chosen as the core layer and the cladding layer respectively. Firstly with EIM, the influence of the relationship between the rib width w and height d on the normalized dispersion curve and the effect of refractive index matching are studied. Then, the base mode field in the waveguide is analyzed to discuss the transmission loss. It has been found that the larger the size ratio w/d of the PMMA rib waveguide is, the greater its effective index neffbeeomes. But this structure size should be limited in certain range, otherwise very large transmission loss would result.

关 键 词：有效折射率法 聚合物 脊形光波导 模式场 

分 类 号：TN252[电子电信—物理电子学]