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提出了一种新型的无冲突４端口榕树型开关网络．采用液晶列阵及偏振棱镜、三角棱镜、波片等光学元件，在光学上实现了这种网络，得到了由４端进到４端出的２４种全排列方式．
A new conflict-free 4-port banyan switch network is proposed. The liquid crystal array and polarization prism, triangular prism, wave plate and other optical components in the optical realization of this network has been from 4 to 4 out of 24 kinds of full arrangement.