ABSTRACT

In this paper, a polarization beam splitter (PBS) based on the gold wire-filled dual-core photonic crystal fiber is proposed. The full-vector finite element method is used to investigate the influences of the fiber structure parameters on the transmission characteristics and coupling length. By appropriately adjusting the fiber structure parameters, the coupling length ratio of 2:1 can be achieved at wavelengths 1.55 and 1.31 μm, so the incident light can be well separated into the two beams with orthogonal polarization states. When the fiber length is 805.3 μm, the maximum extinction ratio (ER) within bandwidth of 60 nm is −132.12 dB at wavelength 1.55 μm. When the fiber length is 1264.9 μm, the maximum ER within bandwidth of 70 nm is −197 dB at wavelength 1.31 μm. By optimizing the fiber structure parameters, a PBS with a length of 249.12 μm, the maximum ER of −112.2 dB, and bandwidth of 120 nm can be obtained.

摘要

本文提出了一种基于金丝填充双芯光子晶体光纤的偏振分束器（PBS）。采用全矢量有限元方法研究了光纤结构参数对传输特性和耦合长度的影响。通过适当地调节纤维结构参数，可以在波长1.55和1.31μm下实现2：1的耦合长度比，从而可以将入射光很好地分离成具有正交偏振态的两束光。当光纤长度为805.3μm时，在波长为1.55μm的60 nm带宽内的最大消光比（ER）为-132.12 dB。光纤长度为1264.9μm时，最大ER在70 nm带宽内，波长1.31μm时为-197 dB。通过优化纤维结构参数，可以获得长度为249.12μm，最大ER为-112.2 dB，带宽为120 nm的PBS 。