摘要
提出了一种基于椭圆双芯光子晶体光纤的偏振分束器，并利用全矢量有限元法分析了偏振分束器长度与结构参数的关系，由此得出了偏振分束器长度随孔间距、占空比和桥路变化的一般规律。研究表明，当椭圆双芯光子晶体光纤偏振分束器结构参数一定时，孔间距越小，桥路宽度越宽，则分束器长度越短；占空比变化对长度影响不明显，但对消光比的影响较明显。进而，通过结构参数的优化，设计出一种超短的椭圆双芯光子晶体光纤偏振分束器，在工作波长1550 nm处，该分束器的长度仅为0.775 mm，消光比高达50 dB，消光比大于20 dB的带宽覆盖了从1535~1565 nm之间30 nm的波长范围，即通信C波段范围。
A dual-elliptical-core polarization splitter based on photonic crystal fiber was proposed. The relationship between splitter length and structure parameters was analyzed using full vectorial finite element method. The variation rules of splitter length with hole pitch, duty circle and bridge were found for the given dual-elliptical-core polarization splitter. Results suggest that if the structure pattern was set, the shorter hole pitch is and the broader the bridge is, the shorter the splitter length is. Duty circle has noticeable influence on extinction ratio, but not on splitter length. According to these rules, an ultra-short dual-elliptical-core polarization splitter was optimized. The length of the polarization splitter is as short as 0.775 mm, extinction ratio reaches up to 50 dB with the wavelength of 1 550 nm, and the bandwidth is more than 30 nm when the extinction ratio more than 20 dB, which covers the communication C band from 1 535 nm to 1 565 nm.
出处
《红外与激光工程》
EI
CSCD
北大核心
2014年第2期506-510,共5页
Infrared and Laser Engineering
基金
国家自然科学基金(61177082)
北京市自然科学基金(4122063)
中央高校基本科研业务费专项基金(2012YJS011)
关键词
偏振分束器
光子晶体光纤
椭圆芯区
全矢量有限元法
polarization splitter
photonic crystal fibers
elliptical-core
full vectorial finite element method
