Author Affiliations
Abstract
1 Department of Electrical Engineering and Computer Science, Ningbo University, Ningbo 315211, China
2 Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, China
Mode splitters that directly separate modes without changing their orders are highly promising to improve the flexibility of the mode-division multiplexing systems. In this paper, we design a high-performance mode splitter on the silicon-on-insulator platform with a compact footprint of 14 µm× 2.5 µm using an inverse design method based on shape optimization. The fabrication of this mode splitter requires only a single lithography step and exhibits good fabrication tolerances. The experimental results show that the proposed device exhibits state-of-the-art insertion loss (<0.9 dB) and cross talk (<-16 dB) over a broad bandwidth (1500–1600 nm). Furthermore, the shape optimization method used is implemented to design a dual-mode (de)multiplexer, and the experimental results fulfill the design objective, demonstrating the excellent generality of the design method in this paper.
integrated optics inverse design mode splitter 
Chinese Optics Letters
2024, 22(1): 011302
作者单位
摘要
1 宁波大学信息科学与工程学院,浙江 宁波 315211
2 浙江大学光学科学与工程学院,浙江 杭州 310058
模式转换器是实现模分复用技术(MDM)的关键部件。基于伴随法对器件边缘进行智能优化,从而在绝缘体上硅(SOI)平台上设计了高性能TE0-TE1模式转换器。经仿真验证,在中心波长1550 nm处,模式转换效率达99.6%,消光比达31.2 dB,而损耗仅为0.01 dB。在1500~1600 nm带宽范围内,TE0-TE1的转换效率保持在96.6%以上,消光比保持在15.7 dB以上,而损耗保持在0.14 dB以下。当器件尺寸变化在±20 nm以内时,器件在1550 nm处的转换效率保持在97.2%以上,消光比保持在16.5 dB以上,插入损耗维持在0.12 dB以下。在片上设计了TE1模式的测试装置,并利用商业流片对转换器进行制备。实验结果表明,在60 nm的带宽范围内,TE0-TE1转换器的转换效率保持在90%以上,插入损耗维持在0.4 dB以下。因此,所提出的转换器具有高转换效率、宽带宽、低插入损耗和高制作容差等特点,为高性能片上模式转换器的高效设计提供了新思路。
集成光学 硅基模式转换器 模分复用 逆设计 伴随法 integrated optics silicon-based mode converter mode multiplexing inverse design adjoint method 
中国激光
2023, 50(18): 1819001
作者单位
摘要
1 宁波大学信息科学与工程学院,浙江 宁波 315211
2 浙江大学光电科学与工程学院,浙江 杭州 310058
3 浙江万里学院数字产业研究院,浙江 宁波 315100
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4 μm×2 μm,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。
集成光学 全光器件 耦合器 逆向设计 integrated optics all-optical devices couplers inverse design 
光学学报
2023, 43(1): 0113001
Author Affiliations
Abstract
1 School of Computer Science and Engineering, Central South University, Changsha 410083, China
2 School of Automation, Central South University, Changsha 410083, China
A geo-localization method is proposed for military and civilian applications, which is used when no global navigation satellite system (GNSS) information is available. The open graphics library (OpenGL) is used to build a three-dimensional geographic model of the test area using digital elevation model (DEM) data, and the skyline can thus be extracted with the model to form a database. Then, MultiSkip DeepLab (MS-DeepLab), a fully convolutional semantic segmentation network with multiple skip structures, is proposed to extract the skyline from the query image. Finally, a matching model based on convolutional neural network (CNN) feature is adopted to calculate the similarity between the skyline features of the query image and the DEM database to realize automatic geo-localization. The experiments are conducted at a 202.6 km2 test site in north-eastern Changsha, China. 50 test points are selected to verify the effectiveness of the proposed method, and an excellent result with an average positioning error of 49.29 m is obtained.
光电子快报(英文版)
2022, 18(5): 300

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