介绍了一种在深紫外波长下工作的特种光纤耦合器,它采用改良的三根光纤一次拉锥成型技术制造,利用旋转的光纤夹具和可移动的火炬获得的低损耗熔融锥区,通过选择不同数值孔径的输入和输出光纤降低熔接损耗。测试结果表明,该方法有助于提高产品的耦合效率,采用芯径为100μm的紫外光纤可以获得大于70%的耦合区传输效率,远高于其他3×1耦合器。 A special fiber coupler operating at deep ultraviolet wavelength is introduced, which is fabricated using a modified three-fiber taper forming technique. The low-loss taper area is obtained using a rotating fiber fixture and a removable torch, The numerical aperture input and output fibers reduce splice losses. The test results show that the method can improve the coupling efficiency of the products. The transmission efficiency of the coupling zone with the core diameter of 100μm can be more than 70%, much higher than that of other 3 × 1 couplers.