Low-loss and polarization insensitive 32×4 optical switch for ROADM applications
作者机构：Department of PhysicsCity University of Hong KongTat Chee AvenueHong KongChina. QXP Technologies Inc.NO.15th Shanglinyuan 1st RoadXi’anShaanxi 710119China. State Key Laboratory of Information of Photonics and Optical CommunicationsSchool of Electronic EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China
出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)
年 卷 期：2024年第13卷第5期
页 面：875-884页
核心收录：
学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学]
基 金：S.T.Chu acknowledges support from the City University of Hong Kong(APRC Grant no.9610395) Y.Ou acknowledges support from the Fundamental Research Funds for the Central Universities(Grant No.2023RC50)
主 题：polarization ROADM optical
摘 要：Integrated switches play a crucial role in the development of reconfigurable optical add-drop multiplexers(ROADMs)that have greater flexibility and compactness,ultimately leading to robust single-chip *** decades of research on switches with various structures and platforms,achieving a balance between dense integration,low insertion loss(IL),and polarization-dependent loss(PDL)remains a significant *** this paper,we propose and demonstrate a 32×4 optical switch using high-index doped silica glass(HDSG)for ROADM *** switch is designed to route any of the 32 inputs to the express ports or drop any channels from 32 inputs to the target 4 drop ports or add any of the 4 ports to any of the 32 express *** switch comprises 188 MachZehnder Interferometer(MZI)type switch elements,88 optical vias for the 44 optical bridges,and 618 waveguidewaveguide crossings with three-dimensional(3D)*** 1550 nm,the fiber-to-fiber loss for each express channel is below 2 dB,and across the C and L bands,below 3 *** each input channel to all 4 drop/add channels at 1550 nm,the loss is less than 3.5 dB and less than 5 dB across the C and L *** PDLs for all express and input channels to the 4 drop/add channels are below 0.3 dB over the C band,and the crosstalk is under−50 dB for both the C and L bands.
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