摘要
提出一种用于密集波分复用系统的光子晶体光分插复用器,该器件为由一个光子晶体Aubry-André-Harper(AAH)谐振腔、一个光子晶体AAH反射腔以及两个光子晶体波导组成的三端口反射腔型光分插复用器。基于耦合模理论建立该结构模型,推导理论谱线并分析决定其传输性能的关键参数,根据理论结果指导基于三维时域有限差分法的仿真设计,得出器件的性能参数。仿真结果表明,该器件可以在1556.2 nm和1555.4 nm的工作波长下实现光波的上/下载功能。光子晶体AAH反射腔和锥形结构减小了光波在主波导上的泄漏和端口处的模式失配损耗,使得插入损耗与各端口串扰分别小于0.51 dB和-29.54 dB。所使用的AAH腔具有高Q值的特性,输出谱线的线宽仅为0.2 nm,尺寸仅为19.35μm×13.33μm。该器件结构紧凑且简单,支持双信道分插复用,易扩展信道,可应用于密集波分复用/解复用器件,在大规模集成的高容量光通信系统领域中具有重要的应用价值。
Objective The silicon-based photonic crystal(PhC)is an artificially manufactured periodic dielectric material,whose unique band gap effect enables optical devices based on this structure to have the advantages of low loss and small size.In recent years,silicon-based PhC devices such as beam splitters,electro-optic modulators,optical switches,mode multiplexers,and optical add-drop multiplexers(OADMs)have received widespread attention from scholars in various countries due to their small size and easy cascading performance in the highly integrated optical communication system.Of various PhC-based devices,OADM,a key device in wavelength division multiplexing(WDM)systems,has attracted more and more attention from researchers.To meet the requirement of the highly integrated optical communication system,OADM design faces three possible challenges that cannot be ignored,namely,low insertion loss,compact size,and easy cascading performance.Moreover,with the advent of 5G,dense wavelength division multiplexing(DWDM)has become a key technology for increasing transmission capacity in optical fiber communication systems.As DWDM devices occupy an important position in optical communication systems,more requirements are posed for OADM design in channel spacing and crosstalk.In this study,we propose an OADM for DWDM systems based on PhCs.The device has low insertion loss,channel crosstalk,small size,and compact structure and can expand channels through cascading to achieve DWDM with channel spacing of 0.8 nm,which has great application potential in highly integrated large-capacity communication systems.Methods This paper designs an OADM on the basis of a two-dimensional(2D)PhC triangular lattice plate of air holes in silicon.In the designed PhC plate in silicon,the circular air holes are arranged in a triangular lattice and periodically distributed along the 2D X-Y planes.The designed structure contains two different Aubry-André-Harper(AAH)bichromatic potential cavities,i.e.,the resonant cavity and the reflection cavity.The res
作者
胡宇宸
陈鹤鸣
Hu Yuchen;Chen Heming(College of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,Jiangsu,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第2期192-201,共10页
Acta Optica Sinica
基金
国家自然科学基金(61571237)
江苏省自然科学基金(BK20151509)。
关键词
光学器件
光子晶体
AAH腔
密集波分复用
耦合模理论
optical device
photonic crystal
AAH cavity
dense wavelength division multiplexing
coupled mode theory
