基于相变材料的低损耗可重构无阻塞光交换网络  

Low-Loss Reconfigurable Non-Blocking Optical Switching Network Based on Phase-Change Materials

作　　者：熊羽庭 郭鹏星 周佳豪 侯维刚 郭磊[1,2] Xiong Yuting;Guo Pengxing;Zhou Jiahao;Hou Weigang;Guo Lei(School of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Institute of Intelligent Communication and Network Security,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学智能通信与网络安全研究院,重庆400065

出　　处：《光学学报》2024年第11期50-57,共8页Acta Optica Sinica

基　　金：国家自然科学基金(62205043,62222103,62221005,62071076,62075024,62001072);重庆市自然科学基金(CSTB2022NSCQMSX1334)。

摘　　要：提出一种以相变材料为基础的低损耗可重构无阻塞光交换网络架构。首先,设计基于低吸收损耗相变材料Sb2Se3与马赫-曾德尔干涉仪(MZI)的2×2全光开关单元,通过光控Sb2Se3相变状态实现开关状态的切换。该单元无需外界持续的偏置电压即可保持开关状态,具有非易失性的特点,此外还能够降低功耗,减少芯片面积。基于此,通过Benes拓扑将2×2光开关与交叉波导级联,构建8×8无阻塞光交换网络。通过调整不同开关单元中Sb2Se3的相变状态,实现8×8光交换网络中任意输入端口至输出端口的可重构光路交换。运用Ansys Lumerical仿真平台对所设计的2×2光开关及交叉波导结构进行仿真与优化,验证所提光交换网络的全连接无阻塞数据交换功能。仿真结果显示,所提2×2光开关的插入损耗和串扰噪声分别低于0.072 dB和-55.66 dB,8×8光交换网络的插入损耗和串扰噪声分别低于0.500 dB和-45.00 dB。因此,所设计的低损耗性能优势的开关结构有助于实现大规模光子集成交换网络。Objective Mach‒Zehnder interferometer(MZI)-based optical switches are widely integrated into data-center optical switching networks owing to their exceptional performance in terms of bandwidth and temperature sensitivity.However,conventional electronically or thermally controlled MZI optical switches exhibit disadvantages of volatility,high insertion loss,and substantial footprint,thus complicating the scaling of the switching network.Hence,this study introduces a novel low-loss all-optical switch and an optical switching network structure based on nonvolatile phase-change materials to facilitate the implementation of large-scale data-center optical switching networks.Methods We propose a 2×2 all-optical switch structure based on nonvolatile phase-change material Sb2Se3 and an MZI[Fig.1(a)].By optically reconfiguring the state of Sb2Se3 within this structure,one can realize switching between the cross and bar states of this optical switch[Figs.1(b)and 1(c)].The 2×2 optical switches were interconnected by optimized lowinsertion loss-crossing waveguides[Fig.4(a)]to form an 8×8 reconfigurable nonblocking optical switching network based on the Benes topology(Fig.3).To minimize loss in the optical switching network,the 2×2 optical switch and crosswaveguide structures were optimized using the Lumericalsimulation platform.Results and Discussions We constructed an 8×8 low-loss reconfigurable nonblocking optical switching network to simulate and verify the functionality of reconfigurable optical switching using the Lumerical INTERCONNECT simulation platform.Initially,we analyzed the state of each 2×2 optical switching unit of single-input light from ports I1 and I2 into the switching network from ports O1,O2,…,O8(Table 1).Subsequently,we obtained the simulation results for the insertion loss and crosstalk noise in the 8×8 optical switching network under different input and output ports.The simulation results indicate that the overall insertion loss of the optical switching network ranges from 0.296 dB to 0.463

关 键 词：集成光学 光交换 非易失性 可重构性 马赫-曾德尔干涉仪 相变材料 

分 类 号：TN256[电子电信—物理电子学]