High-efficiency reflector-less dual-level silicon photonic grating coupler  

作　　者：VALERIO VITALI THALíA DOMíNGUEZ BUCIO COSIMO LACAVA RICCARDO MARCHETTI LORENZO MASTRONAR TEERAPAT RUTIRAWUT GLENN CHURCHILL JOAQUíN FANECA JAMES C.GATES FREDERIC GARDES PERIKLIS PETROPOULOS 

机构地区：[1]Optoelectronics Research Centre,University of Southampton,Southampton,SO171BJ,UK [2]Electrical,Computer and Biomedical Engineering Department,University of Pavia,27100 Pavia,Italy [3]Advanced Fiber Resources Milan S.r.l.,20098 San Donato Milanese,Italy [4]Currently at Instituto de Microelectrónica de Barcelona,IMB-CNM(CSIC),Campus UAB,08193 Bellaterra,Spain

出　　处：《Photonics Research》2023年第7期1275-1283,共9页光子学研究（英文版）

基　　金：Engineering and Physical Sciences Research Council (EP/T007303/1);Agencia Estatal de Investigación and NextGenerationEU/PRTR (FJC2020-042823-I)。

摘　　要：We present the design and experimentally demonstrate a dual-level grating coupler with subdecibel efficiency for a 220 nm thick silicon photonics waveguide which was fabricated starting from a 340 nm silicon-on-insulator wafer.The proposed device consists of two grating levels designed with two different linear apodizations,with opposite chirping signs,and whose period is varied for each scattering unit.A coupling efficiency of-0.8 d B at1550 nm is experimentally demonstrated,which represents the highest efficiency ever reported in the telecommunications C-band in a single-layer silicon grating structure without the use of any backreflector or indexmatching material between the fiber and the grating.

关 键 词：WAVEGUIDE SCATTERING GRATING 

分 类 号：TN622[电子电信—电路与系统]