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基于折射率匹配耦合原理,提出并设计了一种新型宽带单偏振单模光子晶体光纤,阐述了工作原理并利用全矢量有限元法对其进行了数值模拟。当中间纤芯和边芯之间空气孔1和2的直径为2.4μm时,波长在1.26～1.7μm的范围内,偏振相关损耗大于4.08 dB/m,单偏振单模的带宽高达440 nm;当空气孔1和2的直径为2.6μm时,在波长1.31μm处,x偏振模的限制损耗为26.93 dB/m,而y偏振模的限制损耗仅为0.01 dB/m,在波长1.55μm处,x偏振模的限制损耗为38.66 dB/m,y偏振模的限制损耗仅为0.05 dB/m。这种光子晶体光纤具有高带宽特性,并且在1.31μm和1.55μm两个通信窗口存在高相关偏振损耗。
Based on the principle of refractive index matching and coupling, a new broadband single polarization single-mode photonic crystal fiber is proposed and designed. Its working principle is explained and its numerical simulation is carried out by full vector finite element method. When the diameters of the air holes 1 and 2 between the middle core and the core are 2.4μm, the wavelength is in the range of 1.26-1.7μm, the polarization-dependent loss is more than 4.08 dB / m and the bandwidth of single polarization single mode is up to 440 nm. When the air holes 1 and 2 have a diameter of 2.6 μm, the limit loss of the x-mode is 26.93 dB / m at the wavelength of 1.31 μm and the limit loss of the y-mode is only 0.01 dB / m at the wavelength of 1.55 μm , the limiting loss of the x-polarization mode is 38.66 dB / m, and the limiting polarization of the y-polarization mode is only 0.05 dB / m. This photonic crystal fiber has high bandwidth characteristics, and there is high correlation polarization loss in the two communication windows of 1.31 μm and 1.55 μm.