分光比可调的光功率分束器的设计

谢锋; 朱硕隆; 张振荣

doi:10.37188/CO.2023-0038

分光比可调的光功率分束器的设计

doi: 10.37188/CO.2023-0038

广西大学计算机与电子信息学院, 广西南宁530004

基金项目: 国家自然科学基金（No. 12272407，No. 62275269，No. 62275271）；国家重点研发计划（No. 2022YFF0706005）；粤桂联合科学重点基金（No. 2021GXNSFDA076001）；广西重点研发计划（No. AB22080048）

详细信息

作者简介:
谢　锋（1989—），男，广西浦北人，硕士研究生，讲师，2015年于广西大学获得硕士学位，主要从事光器件、人工智能方面的研究。E-mail：664019140@qq.com

张振荣（1976—），男，湖南祁阳人，博士，教授，2005年于新加坡南洋理工大学获得博士学位，主要从事光通信、光器件等方面的研究。E-mail：zzr76@gxu.edu.cn

中图分类号: TN256
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出版历程
- 收稿日期: 2023-03-02
- 修回日期: 2023-03-27
- 录用日期: 2023-04-03
- 网络出版日期: 2023-04-13

Design of an optical power splitter with adjustable split ratio

School of Computer and Electronic Information, Guangxi University, Nanning 530004, China

Funds: Supported by National Natural Science Foundation of China (No. 12272407, No. 62275269, No. 62275271); National Key R & D Program of China (No. 2022YFF0706005); China Guangdong Guangxi Joint Science Key Foundation (No. 2021GXNSFDA076001); KR & DP of Guangxi (No. AB22080048)

More Information

Corresponding author: zzr76@gxu.edu.cn

摘要

摘要:
传统的解析理论设计方案存在计算复杂度高、有限解析解、耗时长等问题。为了解决以上问题，在传统的光器件设计基础上，提出一种依据逆向设计方法的分光比可调的光功率分束器方案。在1.92 μm×1.92 μm的紧凑区域内，引入Ge₂Sb₂Se₄Te₁(GSST)相变材料改变器件的折射率分布。利用直接二进制搜索算法搜索GSST晶态和非晶态的最优状态分布。设计实现同一种器件结构，分光比可调的T型光功率分束器。仿真分析了器件的初始结构、分光比、相变材料区域状态分布、制造容差以及光场分布。结果表明：分光比分别为1∶1、1.5∶1、2∶1的3种光功率分束器在波长1530 nm−1560 nm之间的最小相对误差分别为0.004%、0.14%和0.22%，在制造容差范围内传输曲线最大波动分别是0.95 dB、1.21 dB、1.18 dB。该分光器结构紧凑，在光通信和信息处理领域有着较大的应用潜力。
- 纳米光子系统 /
- 光功率分束器 /
- 逆向设计 /
- 直接二进制搜索
Abstract:
Traditional analytical theory design scheme faces problems, such as high computational complexity, limited analytical solution, and high time-consumption. To cambat these issues, based on the design of traditional optical devices, a scheme for designing an optical power splitter with adjustable split ratio according to the reverse design method is proposed. In a compact region of 1.92 μm×1.92 μm, Ge₂Sb₂Se₄Te₁(GSST) is introduced to change the refractive index distribution of the device. The direct binary search algorithm is utilized to search the optimal state distribution of GSST in crystalline and amorphous states. A T-shaped optical power splitter with adjustable split ratio is designed and implemented for the same device structure. The initial structure, split ratio, phase change material region state distribution, manufacturing tolerance, and light field distribution of the device are simulated and analyzed. The results show the minimum relative errors of the designed optical power splitters with three splitting ratios of 1∶1, 1.5∶1 and 2∶1 between wavelengths 1530 nm and 1560 nm are 0.004%, 0.14% and 0.22%, respectively. The maximum fluctuations of the transmission curve in the manufacturing tolerance range are 0.95 dB, 1.21 dB and 1.18 dB, respectively. The splitter has a compact structure and great potential for applications in optical communication and information processing.
- nanophotonic system /
- optical power splitter /
- reverse design /
- direct binary search

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图 1 算法流程图

Figure 1. Algorithm flow chart

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图 2 像素区域的划分及状态图

Figure 2. Division and state map of pixel regions

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图 3 器件结构

Figure 3. The device structure

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图 4 不同初始结构光功率分束器的光场分布以及初始平面结构

Figure 4. Light field distribution and the initial plane structure of optical power splitter with different initial structures

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图 5 不同初始结构的光功率分束器附加损耗曲线

Figure 5. Excess loss curves of optical power splitters with different initial structures

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图 6 不同分光比的光功率分束器的GSST状态、光场分布、透射光谱以及分光比曲线图

Figure 6. The GSST state, light field distribution, transmission spectrum and splitting ratio curves of optical power splitter with different splitting ratios

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图 7 孔直径在−10 nm至+10 nm变化时的透射光谱响应

Figure 7. The simulated transmission spectra varying with the hole diameter changing from −10 nm to 10 nm

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表 1 不同分光比器件的不同端口在不同制造容差下的误差分析表

Table 1. The error analysis table of different ports of devices with different split ratios under different manufacturing tolerances

Split ratio	Max absolute error Out1(+10)/dB	Max absolute error Out2(+10)/dB	Max absolute error Out1(−10)/dB	Max absolute error Out2(−10)/dB
1∶1	0.26	0.26	0.93	0.95
1.5∶1	0.61	1.05	1.21	0.53
2∶1	0.50	1.18	1.16	0.71

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