On-chip digitally tunable positive/negative dispersion controller using bidirectional chirped multimode waveguide gratings

作     者：Shujun Liu Ruitao Ma Zejie Yu Yaocheng Shi Daoxin Dai Shujun Liu;Ruitao Ma;Zejie Yu;Yaocheng Shi;Daoxin Dai

作者机构：Zhejiang UniversityCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsState Key Laboratory for Extreme Photonics and InstrumentationHangzhouChina Jiaxing Key Laboratory of Photonic Sensing and Intelligent ImagingJiaxingChina Zhejiang UniversityJiaxing Research InstituteIntelligent Optics and Photonics Research CenterJiaxingChina Zhejiang UniversityNingbo Research InstituteNingboChina 

出 版 物：《Advanced Photonics》 (先进光子学（英文）)

年 卷 期：2023年第5卷第6期

页      面：72-82页

核心收录：

学科分类：070207[理学-光学] 07[理学] 0702[理学-物理学] 

基　　金：supported by the National Science Fund for Distinguished Young Scholars(Grant No.61725503) the National Natural Science Foundation of China(Grant Nos.61961146003,62205292,91950205,and 92150302) the Zhejiang Provincial Major Research and Development Program(Grant No.2021C01021) the Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang(Grant No.2021R01001) the Fundamental Research Funds for the Central Universities(Grant No.2021QNA5002) 

主　　题：silicon photonics dispersion tuning digital tuning multimode waveguide grating 

摘      要：A silicon-based digitally tunable positive/negative dispersion controller(DC)is proposed and realized for the first time using the cascaded bidirectional chirped multimode waveguide gratings(CMWGs),achieving positive and negative dispersion by switching the light propagation direction.A 1×2 Mach-Zehnder switch(MZS)and a 2×1 MZS are placed before and after to route the light path for realizing positive/negative *** device has Q stages of identical bidirectional CMWGs with a binary *** the digital tuning is convenient and scalable,and the total dispersion accumulated by all the stages can be tuned digitally from−(2^(Q)−1)D0 to(2^(Q)−1)D_(0) with a step of D_(0) by controlling the switching states of all 2×2 MZSs,where D_(0) is the dispersion provided by a single bidirectional CMWG ***,a digitally tunable positive/negative DC with Q=4 is designed and *** CMWGs are designed with a 4-mm-long grating section,enabling the dispersion D_(0) of about 4.16 ps∕nm in a 20-nm-wide *** dispersion is tuned from−61.53 to 63.77 ps∕nm by switching all MZSs appropriately,and the corresponding group delay is varied from−1021 to 1037 ps.