高Q值、超窄带宽反向耦合型相移光栅  

Contra-Directional Coupling Phase-Shifted Grating with High Q-Factor and Ultra-Narrow Bandwidth

作　　者：廖莎莎 黄琮 冯玉婷 张伍浩 赵帅 刘真伟 Liao Shasha;Huang Cong;Feng Yuting;Zhang Wuhao;Zhao Shuai;Liu Zhenwei(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海200240

出　　处：《光学学报》2023年第1期1-8,共8页Acta Optica Sinica

基　　金：重庆市自然科学基金面上项目(cstc2019jcyj-msxmX0597);上海交通大学区域光纤通信网与新型光通信系统国家重点实验室开放基金(2021GZKF005);重庆市教育委员会科学技术研究项目(KJQN202200613)。

摘　　要：相移光栅是光子集成电路的基本元件之一,被广泛应用于多种领域中。与传统的反射型相移光栅相比,反向耦合型相移光栅无需光环形器,易实现大规模集成。提出了一种高Q值、超窄带宽的反向耦合型相移光栅。利用光栅的Moire效应,通过将不同周期的波导光栅组合在一起,实现了Q值为12893、3 dB凹陷带宽为0.12 nm的反向耦合型相移光栅。该相移光栅具有尺寸小、Q值高和凹陷带宽窄等优势,能被广泛应用于生物传感、激光器和波长滤波等领域中。Objective Phase-shifted gratings are often used in the fields of biosensing, narrow-band filtering, laser, ultra-high-speed optical signal processing, and optical computing and has received widespread attention. Compared with the traditional ring resonator, the phase-shifted grating has a larger working wavelength range and can meet the requirement of narrow-band filtering of a large-bandwidth input signal. In addition, the slightly larger size also brings a larger sample contact area,which can effectively improve the sensing sensitivity. The Q value is often an important indicator for device performance evaluation. For example, in narrow-band filtering, the larger the Q value, the better the wavelength selection performance of the filter, and the purer the filtered signal frequency. In the on-chip biomedical sensors, the larger the Q value, the lower the detection limit of the sensors. Therefore, the study of high-Q phase-shifted gratings has great practical application value. Although the existing π phase-shifted grating schemes have the advantages of a simple process, a high Q value, a narrow bandwidth, and flexible adjustment, they are all reflective schemes. The reflected signals of the gratings will be output through the original input port, and an optical ring needs to be added in practical applications. A magnetooptical device such as a detector separates the reflected signal from the input signal. Adding magneto-optical devices will increase the complexity of the system, and it is difficult to integrate magneto-optic materials with silicon-based devices on a large scale, so the application scenarios of π phase-shifted gratings will also be limited. Therefore, it is of great practical significance to study the contra-directional coupling type of π phase-shifted gratings.Methods To reduce the use of magneto-optical devices such as optical circulators and improve integration, the Moire grating structure is adopted to achieve a high Q value and an ultra-narrow bandwidth performance. According to the refra

关 键 词：光栅 相移光栅 光子集成电路 Moire效应 反向耦合型相移光栅 硅光子学 

分 类 号：TN256[电子电信—物理电子学]