摘要
光子集成技术的高速发展对功能器件的设计效率提出了较高的要求。逆向设计利用优化算法实现器件结构的智能设计,从而可有效降低设计复杂度,提升设计效率。利用基于伴随法的逆向设计算法对硅基平台上的光耦合器进行结构设计,通过优化器件的边界形状,实现了高效率、任意分光比输出。仿真验证了三种1×2光耦合器的性能,其分光比分别为1∶2、1∶4和1∶8(3 dB、6 dB和9 dB)。器件的设计尺寸仅为4μm×2μm,且可以通过一步刻蚀完成。在1550 nm波长处,所设计的耦合器均可达到设计目标,且最大插入损耗仅有0.12 dB。在1500~1600 nm波长范围内,三种耦合器的分光比相对于设计目标的误差均保持在±1 dB以内,并且三种耦合器的插入损耗均低于0.28 dB。针对制作工艺误差等问题,对器件的制作容差进行了分析。结果表明,当耦合器的整体宽度变化±20 nm时,三种耦合器在1550 nm波长处的分光比的误差仍能保持在±1 dB以内。此外,制造了分光比为1∶2的耦合器,且实验结果符合设计目标。
Objective Photonic integrated circuits(PICs) based on silicon-on-insulator(SOI) platforms have attracted much attention due to their high integration density and compatibility with complementary metal-oxide-semiconductor transistor(CMOS)processes. Among the various integrated optical devices on the SOI platforms, optical couplers with arbitrary splitting ratios are widely used for power distribution, passive optical networks, and signal monitoring. Traditional device design methods are limited by the experience of designers and spend a lot of time on structural design and parameter optimization.In addition, when the design targets change, the structure often needs to be redesigned and optimized, which makes the design less efficient due to the large amount of repetitive work. In contrast, inverse design methods use intelligent algorithms to generate desired device structures, and they can effectively reduce design complexity and improve design efficiency. Specifically, the adjoint method is able to calculate the shape derivatives of all points in the space and requires only two simulation processes in each iteration. It can achieve design targets with fewer simulations and iterations, and further improve the design efficiency of devices. The device structures of inverse design can be divided into internal perforation type and boundary optimization type. Internally perforated devices have a large number of holes in their structures, and when light is transmitted in these devices, these holes tend to cause light reflection and thus lead to relatively large transmission losses. The boundary-optimized device structure mainly adjusts the boundary of devices, so it can avoid the existence of a large number of holes in the structure. In this paper, an inverse design method based on the adjoint method is adopted, and an efficient design method for realizing 1×2 optical couplers with arbitrary splitting ratios by optimizing the boundary shapes of devices is proposed. Various optical couplers with different splitting rati
作者
廖俊鹏
田野
杨子荣
康哲
郑紫薇
金庆辉
张晓伟
Liao Junpeng;Tian Ye;Yang Zirong;Kang Zhe;Zheng Ziwei;Jin Qinghui;Zhang Xiaowei(Faculty of Electrical Engineering and Computer Science,Ningbo University,Ningbo 315211,Zhejiang,China;College of Optical Science and Engineering,Zhejiang University,Hangzhou 310058,Zhejiang,China;Digital Industry Research Institute,Zhejiang Wanli University,Ningbo 315100,Zhejiang,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第1期140-149,共10页
Acta Optica Sinica
基金
国家自然科学基金(62105167,62075188,61974078)
浙江省自然科学基金(LQ22F050008,LY21F050007,LY21F040002)
江苏省重点研发计划(BE2021082)
宁波市自然科学基金(2021J074,2021J059)。
关键词
集成光学
全光器件
耦合器
逆向设计
integrated optics
all-optical devices
couplers
inverse design
