Key;
Lab;
of;
All;
Optical;
Network;
and;
Advanced;
Telecommunication;
Network;
of;
Education;
Ministry;
of;
China,;
Institute;
of;
Lightwave;
Technology,;
Beijing;
Jiaotong;
University,;
Beijing;
100044,;
China;
光子晶体光纤; 光纤耦合器; 单偏振; 非对称; 单模; 双核; 矢量有限元法; 气孔直径;