提出了一种基于ZnTe碲酸盐玻璃的单芯光子晶体光纤偏振分束器.在外侧包层纤芯对称位置引入缺陷孔, 使缺陷模和纤芯基模发生耦合以实现光束分离.采用全矢量有限元法对所提出的单芯光子晶体光纤偏振分束器的特性进行研究, 结果表明: 该分束器可以实现1.3 μm和1.55 μm波长光的分离, 并使光束沿X和Y偏振方向同时传播;当光纤长度为15 mm时, 1.3 μm和1.55 μm处的串扰值分别低至-45.1 dB和-40.2 dB, 小于-20 dB的带宽分别为44.2 nm和67.1 nm;在传输波长1.3 μm和1.55 μm处的损耗值为0.063 dB和0.048 dB;偏振分束器在具有低串扰值的同时, 具有较低的限制损耗.

A kind of single-core PCF splitter based on tellurite glass was proposed, defected holes were arranged in the outer cladding, they can bring about strong coupling effect between defected mode and the fundamental mode. FEM was used to analysis its characteristics. The simulation results show that this kind of splitter can split light in the bands of 1.3 and 1.55μm, propagate along the orthogonal polarized directions. For a propagation distance of 15 mm, the -20 dB bandwidth of crosstalk in 1.3 and 1.55 μm bands, reach 44.2 and 67.1 nm. The confinement loss at the wavelength are 0.063 dB and 0.0 48dB. The proposed splitter has low crosstalk and low confinement loss.