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有别于传统的偶数端口对称型光开关设计,本文采用积木叠层方法设计,结构非对称、奇数端口的2×3和3×3光开关;各光开关基本功能单元结构类似,均由偏振光分束器(PBS)、相位型空间光调制器(PSLM)和反射镜组成;利用成熟的偏振控制技术实现信号光的控制和路由选择,有效避免路径的冲突与阻塞。这种设计具有结构简单紧凑、控制方便灵活、双向操作、与偏振无关、即插即用、易集成、易扩容和升级等特点。对2×2光开关单元的实验分析表明,该光开关插损小、串扰低和可靠性高,对于构建大规模的奇数端口和非对称结构的交换矩阵有帮助。
Different from the traditional even-numbered port symmetric optical switch design, this paper adopts 2 × 3 and 3 × 3 optical switches which are designed by the method of building block stacking, asymmetric structure and odd ports. The basic functional units of optical switches are similar in structure, Light beam splitter (PBS), phase type spatial light modulator (PSLM) and mirror. The signal polarization control and routing are realized by using the sophisticated polarization control technology to effectively avoid the path conflict and blockage. This design has the advantages of simple and compact structure, convenient and flexible control, two-way operation, polarization independent, plug and play, easy integration, easy expansion and upgrade. The experimental analysis of the 2 × 2 optical switch unit shows that the optical switch has the advantages of small insertion loss, low crosstalk and high reliability, and is helpful for constructing a large-scale switch fabric with odd-numbered ports and asymmetric structures.