中文摘要：

设计分析了一种基于碲酸盐玻璃的全固态三芯光子晶体光纤偏振分束器.利用三芯光纤中存在的谐振耦合现象,调整光纤结构参量,使某一偏振光无限接近谐振耦合条件产生强耦合,而另一偏振光因远离谐振耦合而耦合程度较弱,实现不同偏振光的分离.该偏振分束器长度短、超宽带、消光比高.在波长1 550nm处,偏振分束器长度仅为1.14mm,消光比高达-101.27dB;消光比小于-20dB的带宽达到100nm;消光比小于-10dB的带宽覆盖了E＋S＋C＋L＋U波段,高达350nm.此全固光子晶体光纤偏振分束器不仅性能优越,结构简单,且全固态的设计结构可有效避免光纤拉制过程中的空气孔坍塌,为设计更优性能的偏振分束器提供了思路.

英文摘要：

An all-solid three-core Photonic Crystal Fibers（PCFs）polarization splitter based on tellurite glass was researched.When one polarization state of light is close unlimitedly to resonance coupling conditions,the other polarization state is far from the resonance coupling conditions resulting in the weak coupling degree.Based on the resonance coupling phenomenon in the three-core PCFs,different polarization states can be separated.The simulation shows that the polarization beam splitter possesses the characteristics of short-length,ultra-band-width and high-extinction ratio at the wavelength of1 550 nm.The length of this splitter is only 1.14 mm and its extinction ratio can reach-101.27 dB.The bandwidth of extinction ratio less than-20 dB reaches 100 nm,and the bandwidth of extinction ratio less than-10 dB reaches up 350 nm which covers E＋S＋C＋L＋U wave bands.This all-solid photonic crystal fiber polarization splitter not only has superior performance,simple structure,its allsolid structural design also can effectively avoid the circumstance of air-holes collapse during the fabrication of photonic crystal fibers,which provides an effective way for better performance polarization splitter.