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基于双折射效应设计了一种新颖的纤芯为椭圆空气孔,包层为圆形空气孔的矩形双芯光子晶体光纤偏振分束器。用半矢量光束传播法(BPM)数值模拟了基模情形下该偏振分束器的性能,结果表明:在工作波长为1.55μm,光纤长度为1659μm时,两个纤芯在X、Y方向偏振光的隔离度分别达到了-41.3 dB和-39.1 dB,隔离度小于-10 dB的带宽超过了80 nm,达到了良好的偏振分束性能。同时,模拟了实际加工误差对所设计的偏振分束器的影响,得出在1.55μm的工作波长下,误差达到±7%时,隔离度仍能小于-10 dB,具有较高的实际应用价值。
Based on the birefringence effect, a novel rectangular double-core photonic crystal fiber polarization beam splitter with elliptical air core and a round air hole is designed. The performance of the polarization beam splitter in the fundamental mode was simulated numerically using semi-vector beam propagation (BPM). The results show that when the working wavelength is 1.55μm and the fiber length is 1659μm, the two cores are polarized in the X and Y directions The light isolation reaches -41.3 dB and -39.1 dB, respectively, and the bandwidth of isolation less than -10 dB exceeds 80 nm, achieving good polarization splitting performance. At the same time, the influence of the actual machining error on the designed polarization beam splitter is simulated, and the isolation degree can still be less than -10 dB when the error reaches ± 7% at the working wavelength of 1.55μm, which is of high practical application value.