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提出了一种基于Mach-Zehnder干涉仪(MZI)结构开关单元和Banyan网络的严格无阻塞4×4矩阵光开关。相对于Crossbar结构的7级单元级联,Banyan结构只需3级连接。分析了Banyan网络中交叉连接损耗与交叉角度的关系,交叉角30°时损耗为0.09dB。优化设计了MZI开关单元结构,并制作了2×2光开关,测得插入损耗(IL)为-14dB、串扰(XT)为-38dB和功耗为450mW。设计了基于Banyan网络的4×4光开关,连接波导交叉角为30°。基于光波导平面光波线路(PLC)技术,制作了严格无阻塞的SiO2波导4×4矩阵光开关,测得平均IL为3.95dB、通道XT为-37dB、偏振相关损耗(PDL)为0.4dB、单通道开关功率约为670mW及开关响应时间小于1ms。
A strict non-blocking 4 × 4 matrix optical switch based on Mach-Zehnder interferometer (MZI) switch unit and Banyan network is proposed. The Banyan architecture requires only a level 3 connection relative to a 7-level cell cascade with a Crossbar structure. The relationship between crossover loss and cross angle in Banyan network is analyzed. The loss is 0.09dB when the cross angle is 30 °. The MZI switch cell structure was optimized and a 2 × 2 optical switch was fabricated. The measured insertion loss (IL) was -14dB, crosstalk (XT) was -38dB and power dissipation was 450mW. A 4 × 4 optical switch based on Banyan network was designed, and the cross angle of waveguide was 30 °. Based on the optical waveguide planar lightwave circuit (PLC) technology, a strict non-blocking SiO2 waveguide 4 × 4 matrix optical switch was fabricated. The measured average IL was 3.95dB, the channel XT was -37dB, the polarization dependent loss (PDL) Single-channel switching power of about 670mW and switching response time of less than 1ms.