单模As2S3光纤制备及其弯曲损耗

Fabrication and Bending Loss of Single-Mode AsS Glass Fibers

采用动态蒸馏纯化工艺和熔融淬冷法制备了纤芯和内外包层玻璃组分分别为As40S60和As39S61的硫系玻璃,采用计算机数控车床钻孔法制备了包层套管,结合二次管棒法拉制出包层和纤芯直径分别为124mm和5mm的硫系光纤,对其纤芯和包层玻璃折射率、光纤端面几何尺寸、传输和弯曲损耗等进行了测量和分析。结果表明:该光纤在2.5~10.0mm波段数值孔径(NA)小于0.425,且纤芯和包层同心度较好,光纤在1 550 nm波长下的损耗为1.7 d B/m,光纤在λ>2.5mm波段呈现单模传输特性。当光纤弯曲半径达到20 mm左右时损耗急剧增加。

The As40S60 core and As39S61 inner and outer cladding glasses were fabricated with the dynamic distillation purification process and melt-quenching method.The cladding tube was prepared by a computerized numerical control precision drilling machine,and then the fiber with the cladding and core diameter of 124mm and 5mm was produced by the combination of the secondary tube in rod method.The refractive index of core and cladding,cross-section dimensions,loss and bending loss of the fiber was measured and analyzed.The results show that the NA of the fiber is less than 0.425 in the wavelength range of 2.5 10.0mm and its concentricity between core and cladding is good.The fiber has the minimum loss of 1.7 dB/m at 1 550 nm,and single-mode mode in the wavelength range of>2.5mm.The fiber transmission losses increase sharply when the bending radius reduces to 20 mm.