摘要
为从波长信道中实现信号优良的选择性输出,设计了带有光子晶体U-型谐振器(PCUR)的反射式分束器结构。利用时域有限差分(FDTD)方法研究了其结构电磁波功率分束特性。设计的4种对称结构可用于输入波长的功率二等均分,在第三通信窗口都具有传输率高的特性;设计的5种的非对称结构具有峰值波长信号串扰弱的特性。根据设计需求,在带有3×2 PCUR的对称结构中分别调整其结构的两PCURs的散射介质柱半径,或其内部介质柱半径,能设计出不同信道波长间隔的高传输率分束器。研究表明:这些微型波长分束器件具有波长选择性优良、设计灵活、峰值波长处串扰弱等优点。在低损耗光路集成设计、波长密集型光通信系统设计等方面存在潜在应用价值。
In order to obtain excellent output signals from wavelength channels, the structures of reflecting splitters based on photonic crystal U-shaped resonators （PCUR） are designed. Electromagnetic wave power splitting characteristics of these structures are studied by the time- domain finite- difference method. Four symmetrical structures can split wavelength power into two equal parts, and all of them have the characteristic of high transmission efficiency in the third communication window. Five asymmetrical structures have the characteristic of low signal crosstalk at the peak wavelength. According to our needs of designs, high transmission efficiency splitters with different channel wavelength intervals can be obtained by changing radii of scattering dielectric rods or 3×2 inner rods of the two PCURs in the symmetrical structure of reflecting splitters based on 3×2 PCURs. The results show that these micro reflecting splitters based on PCURs have the advantages of excellent wavelength selectivity, flexible designs, low crosstalk at peak wavelength and so on. These structures have potentially applicable value in the fields of low loss optical integrated circuits, high density wavelength optical communication systems etc.
出处
《激光与光电子学进展》
CSCD
北大核心
2016年第2期167-175,共9页
Laser & Optoelectronics Progress
基金
国家自然科学基金(11375081)
关键词
集成光学
反射式分束器
光子晶体U-型谐振器
时域有限差分法
弱串扰
传输率高
integrated optics
reflecting splitter
photonic crystal U-shaped resonator
time-domain finite-difference method
low crosstalk
high transmission efficiency
