一种基于直波导与单环耦合带阻滤波器的研制
Development of a Band-stop Filter Based on a Straight Waveguide Coupled with a Single Loop
李喜龙 1武朝霞 2徐思桦 1岳子良1
作者信息
- 1. 西安文理学院机械与材料工程学院,西安 710065
- 2. 安阳市中等职业技术学校教务科,河南安阳 455000
- 折叠
摘要
依据耦合场理论和微环谐振理论,基于COSMOL软件设计了一款纤芯为CdS,包层为Ag的直波导与单环耦合谐振器.在工作波长1 540～1 580 nm范围内,采用有限元方法分析了该耦合器的透过率和耦合强度.研究发现:在入射波长为1.55μm和其它设置参数不变的情形下,改变直波导与单环间距H.在谐振条件下,当间距H为200 nm时,微环谐振腔腔内光能量会得到显著增强,此时微环内耦合强度最大,因此透射率最小,可作为环形腔带阻滤波器.在H为200 nm,其它设置参数不变,改变波长,发现在波长1.560 3 μm处直波导与微环耦合强度达到最大值.最后,将基于COSMOL仿真得出的透射率与吸收率曲线与MATLAB结果进行对比,证实直波导与微环耦合间距H为200 nm,波长1.560 3 μm处耦合强度和吸收率达到接近于1,此微结构可作为环形腔带阻滤波器.
Abstract
A straight waveguide and single-ring coupled resonator with CdS core and Ag cladding is designed based on the coupled field theory,the micro-ring resonance theory,and COSMOL software.In the range of 1 540-1 580 nm of working wavelength,the transmittance and coupling strength of the coupler are analyzed by finite element method.It is found that the distance H between the straight waveguide and the single ring is changed when the incident wavelength is 1.55 μm and other setting parameters are unchanged.Under the condition of resonance,when the distance H is 200 nm,the optical energy in the micro-ring resonator will be significantly enhanced,and the coupling intensity in the micro-ring is the largest,so the transmittance is the smallest,which can be used as a band-stop filter in the ring cavity.When H is 200 nm,in the case of other setting parameters unchanged but only the wavelength changed,it is found that the coupling strength between straight waveguide and micro-ring reaches the maximum at the wavelength of 1.560 3 μm.Finally,the curves of transmittance and absorption based on COSMOL simulation are compared with the MATLAB results.It is confirmed that the coupling distance H between the straight waveguide and the micro-ring is 200 nm,the coupling strength and absorption at the wavelength of 1.560 3 μm are close to 1,which indicates that this microstructure can be used as a band-stop filter of the ring cavity.
关键词
集成光学/微环谐振器/耦合强度Key words
integrated cptics/micro-ring resonator/coupling strength引用本文复制引用
出版年
2024
NETL
NSTL
万方数据