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首先,对无阻塞的Clos(2,4,2)光网络的拓扑结构和光学实现进行了理论分析;其次,利用偏振光分束器(PBS)、相位型空间光调制器(PSLM)和反射镜设计1×2、2×2和2×4光开关。进而设计无阻塞的Clos(2,4,2)光网络,并讨论了n×m型光开光的设计原则和升级能力。最后,通过实验测试,光开关的串扰最低可以达到-24.0dB,插入损耗最低为0.54dB。理论分析和实验表明,该光开关所用器件少,具有结构简单紧凑、控制灵活方便和功能实现与信号光的偏振态无关等特点。
First of all, the theoretical analysis of the topology and optical implementation of a non-blocking Clos (2,4,2) optical network is carried out. Secondly, by using a polarization beam splitter (PBS), a phase type spatial light modulator (PSLM) Mirror design 1 × 2,2 × 2 and 2 × 4 optical switches. Then the non-blocking Clos (2,4,2) optical network is designed, and the design principle and the upgrade capability of the n × m optical switch are discussed. Finally, through the experimental test, the optical crosstalk can reach -24.0dB with the lowest insertion loss of 0.54dB. Theoretical analysis and experiments show that the device used in the optical switch has less features, such as simple and compact structure, flexible and convenient control and independent of the polarization state of the signal light.