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中文摘要：
以碲玻璃为基质材料,设计了八边形双芯光子晶体光纤.应用全矢量有限元法和模式耦合基本理论分析了八边形双芯光子晶体光纤中结构参数对耦合长度特性的影响.计算结果表明：在波长1.55μm处,减小孔间距可明显减小耦合长度,但只略微改变相对耦合长度;增大空气孔及椭圆率可略微增大耦合长度,但可明显增大相对耦合长度.当相对耦合长度为1时,设计的偏振分束器性能较理想.在此基础上,通过调节结构参数,设计了一种较短传输长度、高带宽、高消光比的偏振分束器,当光纤长度为139μm时,X、Y方向偏振光即可实现分离,消光比达到最小值-53.46dB,且在波长1.49μm~1.61μm,即带宽为120nm范围内,消光比小于-20dB,与同类型的高消光比和极短长度双芯偏振分束器相比,其综合性能比较突出.
英文摘要：
A novel octagonal duel-core photonic crystal fiber based on tellurite glass was proposed.Using the Full-vector finite Element Method（FEM）and coupled-mode theory,impacts of structural parameters on characteristics of the coupling was analyzed.The results show that the coupling length decreases significantly as the value of hole-pitch decreases,but the relative coupling length changes slightly as the value of hole-pitch decreases;the coupling length increases slightly as the value of air hole diameter increases,the relative coupling length increases significantly as the value of air hole diameter increases;the coupling length increases slightly as the value of ellipticity increases,the relative coupling length increases significantly as the value of ellipticity increases.The performance of the design polarization splitters was desired when the relative coupling length is 1.Then a kind of polarization splitters based on the proposed dual-core PCF was obtained.The two polarized lights are separated entirely with 139 μm fiber,simultaneously the polarized light extinction ratio is-53.46 dB at the wavelength of 1.55μm.Besides,the bandwidth is over 120 nm when the extinction ratio is less than-20 dB,which exhibited high performance of splitting one light into two orthogonal polarization states comparing to the other duel-core polarization splitter with highly extinction ratio and short length.
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