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Compact and broadband multimode waveguide bend by shape-optimizing with transformation optics

查看全文 作　　者：SHUYI [1]LI;LIFENG [1]CAI;DINGSHAN [1]GAO;JIANJI [1]DONG;JIN [2]HOU;CHUNYONG [2]YANG;SHAOPING [2]CHEN;XINLIANG [1]ZHANG 高影响力作者 机构地区：[1]Wuhan National Laboratory for Optoelectronics&School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China;[2]Hubei Key Laboratory of Intelligent Wireless Communications,College of Electronics and Information Engineering,South-Central University for Nationalities,Wuhan 430074,China高影响力机构 出　　处：《Photonics Research》索引2020年第8卷第12期,共7页高影响力期刊 基　　金：National Natural Science Foundation of China(11504435,61975062);National Key Research and Development Program of China(2019YFB2205202);Innovation Fund of WNLO. 摘　　要：Multimode waveguide bend is one of the key components for realizing high-density mode-division multiplexing systems on chip.However,the reported multimode waveguide bends are either large,bandwidth-limited or fabrication-complicated,which hinders their applications in future high-density multimode photonic circuits.Here we propose a compact multimode waveguide bend supporting four TE modes simply by shape-optimizing with transformation optics.The shape of the waveguide is optimized in the virtual space with gradient distribution of the refractive index,so that the scattering loss and intermode cross talk are well suppressed.After conformal mapping back into the physical space,a compact(effective radius of 17μm)multimode bending waveguide is obtained.Simulations show that the proposed multimode waveguide bend has little loss(<0.1 dB)and low cross talk(<−20 dB)throughout an ultrabroad wavelength range of 1.16–1.66μm.We also fabricated the shape-optimized multimode bending waveguide on a silicon-on-insulator wafer.At 1550 nm wavelength,the measured excess losses for the four lowest-order TE modes are less than 0.6 dB,and the intermode cross talks are all below−17 dB.Our study paves the way for realizing high-density and large-scale multimode integrated optical circuits for optical interconnect. 关 键 词：WAVEGUIDE MULTIMODE OPTICS
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