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采用折射率匹配耦合法,提出了一种偏振可调的单偏振单模太赫兹光纤。通过在纤芯设计非对称微结构来实现芯模x、y偏振模式的分裂;在包层空气孔中填充折射率匹配液来引入缺陷模式,通过调整液体折射率来分别实现它与芯模x、y偏振模式的匹配。结果表明,当液体折射率为1.288时,x偏振模式匹配。当入射光频率大于0.73THz时,偏振损耗比大于100,光纤以y偏振模式运转;当入射光频率为1THz时,偏振损耗比达到最大值1020。当液体折射率为1.338时,y偏振模式匹配。当入射光频率在0.87~0.93THz时,偏振损耗比大于100,光纤以x偏振模式运转;当入射光频率为0.9THz时,偏振损耗比达到最大值118。该设计实现了光纤单偏振运转模式的切换,具有宽带、可调、易于实现的特点。
A polarization-adjustable single-polarization single-mode terahertz optical fiber is proposed by adopting a refractive index matched coupling method. By designing the asymmetric microstructure in the core to achieve the splitting of the x, y polarization mode of the core, the cladding air hole is filled with the refractive index matching solution to introduce the defect mode. By adjusting the refractive index of the liquid, , Y polarization mode matching. The results show that when the liquid refractive index is 1.288, the x-polarization mode matches. When the incident light frequency is greater than 0.73THz, the polarization loss ratio is greater than 100 and the optical fiber operates in y-polarization mode. When the incident light frequency is 1THz, the polarization loss ratio reaches the maximum 1020. When the liquid refractive index is 1.338, the y-polarization mode matches. When the incident light frequency is 0.87 ~ 0.93THz, the polarization loss ratio is greater than 100, and the fiber operates in x-polarization mode. When the incident light frequency is 0.9THz, the polarization loss ratio reaches the maximum value of 118. The design of the optical single-polarization operation mode switching, with broadband, adjustable, easy to implement features.