We propose a cross-connection and a T-connection in periodic dielectric waveguides (PDWs) with ultrasmall size and high transmission efficiency at lambda velence 1.55 (mu)m. The cross-connection was formed by introducing a 3 X 3 square dielectric resonant cavity at the cross-junction with a crosstalk of less than 0.8percent (about -21 dB) and a transmission of larger than 93percent at the desired output port. The T-connection was formed by introducing a 3 X 5 dielectric resonant cavity with modifications at the T-junction. The total transmission is up to 95percent. In addition, different power splitting ratios were also achieved by moving the input waveguide of the T-connection with different displacements.
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机译：我们提出了周期性介电波导（PDW）中的交叉连接和T连接，其尺寸超小且传输效率高，λ速度为1.55μm。交叉连接是通过在交叉连接处引入3 X 3方形介电共振腔而形成的，串扰小于0.8％（大约-21 dB），并且在所需输出端口的传输大于93％。 T形连接是通过在T形结处引入一个经过修改的3 X 5介电共振腔而形成的。总传输率高达95％。此外，通过以不同的位移移动T型连接的输入波导，也可以实现不同的功率分配比。
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