中文摘要：

基于 silicon-on-insulator (SOI ) 优化了 2 个脳 2 开关被表明。在设计，单个模式肋骨波导和 multimode 干扰(MMI ) 被逐渐变细的波导连接减少联合在波导的二种类型之间的损失的模式。开关的平均插入损失在附近 ? 16.9 dB 和一个的过量损失被测量 ? 1.3 dB。最糟的串音比 25 dB 大。试验性的结果与理论上的分析显示一些光开关的主要特征在修改设计被改进，它是。新奇设计能被用来基于 2 个脳 2 开关单位改进光开关矩阵的特征。CLC 数字 TN256 这个工作被中国(资助 No.60577044 ) 和科技鈥 ? 的部的国家科学基金部分地支持 73 鈥 ? 计划(No.2006CB302803 )

英文摘要：

Optimized 2×2 switches based on silicon-on-insulator （SOI） were demonstrated. In the design, single mode rib waveguides and multimode interferences （MMIs） are connected by tapered waveguides to reduce the mode coupling loss between the two types of waveguides. The average insertion loss of the switches is about -16.9 dB and the excess loss of one is measured of -1.3 dB. The worst crosstalk is larger than 25 dB. Experimental results indicate that some of the main characteristics of optical switches are improved in the modified design, which is according with theoretic analysis. The novel design can be used to improve the characteristics of optical switch matrixes based on 2×2 switch units.