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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1 550 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1 535~1 565 nm之间30 nm的波长范围,即通信C波段范围。
A polarization beam splitter based on an elliptical double-core photonic crystal fiber is proposed. The relationship between the length of the polarization beam splitter and the structural parameters is analyzed by the full-vector finite element method. From this, the relationship between the length of the polarization beam splitter and the aperture spacing , The general rule of duty cycle and bridge change. The results show that when the structural parameters of the elliptical double-core photonic crystal fiber polarization beam splitter are constant, the smaller the hole spacing and the wider the bridge width, the shorter the beam splitter length; the change of the duty cycle has no obvious effect on the length, The impact of extinction ratio is more obvious. Furthermore, an ultra-short elliptical dual-core photonic crystal fiber polarization beam splitter was designed by optimizing the structural parameters. At an operating wavelength of 1 550 nm, the beam splitter has a length of only 0.775 mm and an extinction ratio of up to 50 dB , The extinction ratio of more than 20 dB of bandwidth covers the wavelength range of 15 nm from 1553 nm to 1565 nm, that is, the communication C-band range.