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设计了一种聚甲基丙烯酸甲酯(PMMA)基的单偏振单模(SPSM)微结构聚合物光纤(MPOF)。采用全矢量平面波展开法并结合完美匹配边界条件,对其偏振特性进行了理论模拟。详细讨论了微结构光纤参数的变化对单偏振单模带宽和工作波长的影响,发现在0.57～0.71μm的可见光波长范围,由于基模两个正交偏振模的截止波长不同,这种微结构聚合物光纤只能传输基模中的一个偏振模。光束传播法计算表明,在波长0.65μm处具有7圈空气孔的单偏振单模微结构聚合物光纤的传导偏振模约束损耗仅为1.24dB/m,这种低损耗的单偏振单模微结构聚合物光纤可有效消除传统保偏光纤固有的偏振串扰和偏振模色散。
A PMMA based single polarization single-mode (SPSM) microstructured polymer optical fiber (MPOF) was designed. A full vectorial plane wave expansion method is used in combination with the perfectly matched boundary conditions to theoretically simulate its polarization characteristics. The influence of the change of the parameters of the microstructured fiber on the single-polarization single-mode bandwidth and the working wavelength is discussed in detail. It is found that in the visible wavelength range of 0.57 ~ 0.71μm, due to the different cut-off wavelengths of the two orthogonal polarization modes of the fundamental mode, The polymer fiber can only transmit one polarization mode in the fundamental mode. The beam propagation method shows that the polarization polarization mode loss of a single-polarization single-mode microstructured polymer fiber with 7 air holes at a wavelength of 0.65 μm is only 1.24 dB / m. This low-loss single polarization single-mode microstructure Polymer optical fiber can effectively eliminate the polarization polarization crosstalk and polarization mode dispersion inherent in traditional polarization maintaining fibers.