基于400 nm氮化硅平台的片上光放大器波导宽度的优化模型  

Waveguide Width Optimization of On-Chip Optical Amplifier Based on 400 nm Silicon Nitride Platform

作　　者：陈明哲 江文兵 杜嘉 张博宇 陈卫标[2,3] 周立兵 Chen Mingzhe;Jiang Wenbing;Du Jia;Zhang Boyu;Chen Weibiao;Zhou Libing(Department of Optics and Optical Engineering,University of Science and Technology of China,Hefei 230026,Anhui,China;Department of Space Laser Technology and System,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学技术大学光学与光学工程系,安徽合肥230026 [2]中国科学院上海光学精密机械研究所空天激光技术与系统部,上海201800 [3]中国科学院大学材料科学与光电技术学院,北京100049

出　　处：《光学学报》2024年第11期97-103,共7页Acta Optica Sinica

基　　金：国家自然科学基金(62375274)。

摘　　要：提出一种基于400 nm氮化硅平台的掺铒光波导放大器(EDWA)波导宽度的精确设计模型。首先,采用半矢量有限差分法获取波导的截止条件与信号光单模条件,确定波导宽度的设计范围。其次,考虑光纤-波导的耦合过程以及泵浦光经过端面耦合器时会对不同模式产生不同的激发效应,仿真设计一种针对980 nm泵浦光的双层端面耦合器,分析不同波导宽度对应的功率分配系数,从而精确建模泵浦光模场。最后,考虑1550 nm信号光与980 nm泵浦光的相互作用,优化EDWA的速率-传输方程,系统地分析不同波导宽度与长度对EDWA增益的影响,并对比分析未考虑信号光与泵浦光相互作用的增益性能,确定增益效果最好的波导宽度与长度。结果表明:信号光与泵浦光的相互作用是影响增益效果的重要因素,同时也为高增益系数的EDWA器件精确设计奠定基础。Objective In the optical fiber transmission system,an optical amplifier emerges to compensate for the device loss and attenuation caused by long-distance optical fiber transmission.Traditional erbium-doped fiber amplifiers(EDFAs)often require tens of meters of fiber,and the larger footprint is increasingly unable to meet the trend of integrated and miniaturized communication systems.Thus,erbium-doped optical waveguide amplifiers(EDWAs)with smaller volume and lower energy consumption have been proposed by researchers.However,EDWA also faces many challenges.For a mature chip foundry,the waveguide design is particularly critical,and second,when the chip is employed in a communication system,the coupling problem between the fiber and the chip should be solved.Thus,we propose an accurate design model for the waveguide width of EDWA based on a 400 nm silicon nitride platform.This model takes into account the fiber-chip coupling problem and obtains the waveguide parameters with the best gain effect based on the interaction between signal light and pump light.We hope our research can help design a high-gain EDWA and provide ideas for implementing EDWA on different platforms.Methods The waveguide cutoff condition and single mode condition of signal light are obtained by the semi-vector finite difference method,with the range of waveguide width determined.Considering the coupling between the optical fiber and the waveguide,and different excitation effects of the pump light by the edge coupler in different modes,the double-layer edge coupler of 980 nm pump light is simulated.By analyzing the power distribution coefficients corresponding to different waveguide widths,the model of the pump optical mode field is built accurately.Finally,considering the interaction between 1550 nm signal light and 980 nm pump light,the rate-transfer equation of EDWA is optimized.The effects of different waveguide widths,lengths,and distances between waveguides on EDWA gain are systematically analyzed.With the interaction between signal light an

关 键 词：集成光学 光波导放大器 速率方程 增益 

分 类 号：TN252[电子电信—物理电子学]