Automatic synthesis of light-processing functions for programmable photonics:theory and realization  

作　　者：ZHENGQI GAO XIANGFENG CHEN ZHENGXING ZHANG UTTARA CHAKRABORTY WIM BOGAERTS DUANE S.BONING 

机构地区：[1]Microsystems Technology Laboratories,Electrical Engineering and Computer Science,Massachusetts Institute of Technology,Cambridge,Massachusetts 02139,USA [2]Ghent University-IMEC,Department of Information Technology,Ghent,Belgium [3]Center of Nano-and Biophotonics,Ghent University,Ghent,Belgium

出　　处：《Photonics Research》2023年第4期643-658,共16页光子学研究（英文版）

基　　金：European Research Council(725555)。

摘　　要：Linear light-processing functions(e.g.,routing,splitting,filtering)are key functions requiring configuration to implement on a programmable photonic integrated circuit(PPIC).In recirculating waveguide meshes(which include loop-backs),this is usually done manually.Some previous results describe explorations to perform this task automatically,but their efficiency or applicability is still limited.In this paper,we propose an efficient method that can automatically realize configurations for many light-processing functions on a square-mesh PPIC.At its heart is an automatic differentiation subroutine built upon analytical expressions of scattering matrices that enables gradient descent optimization for functional circuit synthesis.Similar to the state-of-the-art synthesis techniques,our method can realize configurations for a wide range of light-processing functions,and multiple functions on the same PPIC simultaneously.However,we do not need to separate the functions spatially into different subdomains of the mesh,and the resulting optimum can have multiple functions using the same part of the mesh.Furthermore,compared to nongradient-or numerical differentiation-based methods,our proposed approach achieves 3×time reduction in computational cost.

关 键 词：synthesis. SYNTHESIS FUNCTIONS 

分 类 号：O43[机械工程—光学工程]