单偏振光子晶体光纤

Photonic Crystal Fiber with Single Polarization

提出了一种能够在较宽波长范围内保持单偏振的光子晶体光纤,并利用频域有限差分法对其偏振特性进行了数值分析。在孔间距Λ取2.3μm,第一层较大空气孔直径dl取2.4μm,较小空气孔直径ds取1.4μm,包层中其它空气孔的直径d取0.6μm的条件下,这种单偏振光子晶体光纤在1.02-2.0μm波长范围内,保持较高的模式双折射。当较大空气孔直径dl取2.8μm,较小空气孔直径ds取1.4μm时,在1.35-2.0μm波长范围内,仅有一个偏振模能够存在,且波长1.31μm处的模式双折射度达到3.5×10-3。

A novel photonic crystal fiber that maintains single polarization at a relatively wide wavelength range is presented and analyzed with a full-vectorial compact-two-dimensional finite-difference method. When the space of hole to hole is 2.3 μm, the diameter of the larger holes in the first ring is 2.4 μm, the diameter of the smaller air holes in the first ring is 1.4 μm, and the diameter of other air holes is 0.6 μm, this single polarization fiber （SPF） maintains a high mode birefringence at wavelength range of 1.02-2.0 μm. When the diameter of the larger air holes is 2.8 μm, and the diameter of the smaller air holes is 1.4 μm, only one polarization mode can be guided in the range of 1.35-2.0 μm and the modal birefringence at the wavelength 1.31 μm can reach 3.5 × 10^-3.