摘要
多模干涉耦合器结构的功率分束器拥有大带宽、较好制造鲁棒性等优势,长期以来受到人们的关注.本文提出的是一种基于相变材料In_(2)Se_(3)的超紧凑可调控功率分束器,尺寸仅有2.4μm×3.6μm,采用1×2的多模干涉耦合器结构,在不改变其他结构参数的情况下,采用直接二进制搜索算法对器件进行优化,仅通过In2Se3的a态与β态的可逆相变,利用两种晶态之间的高折射率对比度实现了不同的功率分束比.与其他可调控的功率分束器相比,本文设计的这种功率分束器结构紧凑、调控简单,并且具有较好的鲁棒性.利用该器件在1540—1560 nm的波长范围内实现了1∶1,1∶1.5,1∶2三种分束比,插入损耗分别小于0.27,0.13和0.17 dB.证明了这种基于相变材料In2Se3的超紧凑可调控功率分束器在光子集成电路上应用的可能性.
Power splitter with multi-mode interference coupler structure has many advantages,such as large bandwidth and better manufacturing robustness,and has received much attention for a long time.Conventional power beam splitters usually use algorithms or numerical simulation to achieve a single beam splitting ratio;if the circuit has the requirement for power,the structural parameters of the device need changing and recalculating.In order to improve the utilization rate of power splitter in photonic integrated circuit and meet various demands for different optical paths,an ultra-compact tunable power splitter based on phase change material In2Se3 with a 1×2 multimode interference coupler structure is proposed in this paper.The device consists of an input waveguide,a coupling region,and two output waveguides with a coupling region of only 2.4μm×3.6μm in size,which contains several circular holes of the same size and is filled with SiO2.The number and location of circular holes in the coupling region are optimized by direct binary search algorithm,making the device achieve different power splitting ratios by using only the high refractive index contrast variation between the two crystalline states(a and b)of In_(2)Se_(3)without changing any other structural parameter.In a wavelength range of 1540–1560 nm,three splitting ratios of 1∶1,1∶1.5 and 1∶2 are achieved by this device,and the insertion losses of these three beam splitting ratios are less than 0.27,0.13 and 0.17 dB,respectively.In addition,the robustness and balance of the device are analyzed and discussed,and compared with those of the power splitter of the same size designed by SOI platform and several power beam splitters reported in recent years,demonstrating the compact structure and simple regulation of this power splitter based on the phase change material In2Se3,its good robustness,and its possibility of application on photonic integrated circuits.
作者
张伊祎
韦雪玲
农洁
马汉斯
叶子阳
徐文杰
张振荣
杨俊波
Zhang Yi-Yi;Wei Xue-Ling;Nong Jie;Ma Han-Si;Ye Zi-Yang;Xu Wen-Jie;Zhang Zhen-Rong;Yang Jun-Bo(Guangxi Key Laboratory of Multimedia Communication and Network Technology,College of Computer and Electronic Information,Guangxi University,Nanning 530004,China;Experimental Center of Material Science,National University of Defense Technology,Changsha 410073,China;School of Microelectronics,South China University of Technology,Guangzhou 511442,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第15期99-106,共8页
Acta Physica Sinica
基金
国家自然科学基金(批准号:12272407,62275269,62275271)
国家重点研发计划(批准号:2022YFF0706005)
粤桂联合科学重点基金(批准号:2021GXNSFDA076001)资助的课题.
关键词
功率分束器
相变材料
逆向设计
集成光学
power beam splitter
phase change materials
reverse design
integrated optics
