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G.657光纤具有优异的弯曲损耗不敏感性能,被认为是诸如光纤到户(FTTH)等局域网和接入网系统的首选产品,因此,该光纤的研究倍受重视。提出了一种采用全合成工艺制造G.657光纤的方法,详细探讨了芯层和第一包层区的厚度(a、b)及其折射率差(△1、△2)与光纤性能之间的关系。研究表明,当a的取值在3.5～4.0μm之间,b的取值在0.5～1.9μm之间,△1的取值在0.0034～0.0045之间,△2的取值在-0.0006～0之间时,可制得满足ITU.T G.657.A标准的光纤;当a的取值在2.8～3.2μm之间,b的取值在0.8～2.1μm之间,△1的取值在0.0058～0.0072之间,△2的取值在-0.0016～-0.0008之间,可制得满足ITU.T G.657.B标准的光纤。且该光纤在结构上相对简单,无特殊设计的沟、槽、孔,因此制作工艺相对容易、稳定,易于推广和应用。
G.657 fiber has excellent bending loss insensitivity and is considered as the preferred product for LAN and access network systems such as FTTH. Therefore, the research of this fiber has drawn great attention. A method of fabricating G.657 fiber by the all-synthetic process is proposed. The thickness (a, b) of the core layer and the first cladding region, the refractive index difference (△ 1, △ 2) Relationship between. The results show that when the value of a is between 3.5 and 4.0 μm, the value of b is between 0.5 and 1.9 μm, the value of Δ 1 is between 0.0034 and 0.0045, the value of Δ 2 is between -0.0006 and 0 Between the time can be obtained to meet the ITU.T G.657.A standard optical fiber; when a value between 2.8 ~ 3.2μm, b value between 0.8 ~ 2.1μm, △ 1 value 0.0058 ~ 0.0072 between the value of △ 2 between -0.0016 ~ -0.0008, can be prepared to meet the ITU.T G.657.B standard optical fiber. The optical fiber is relatively simple in structure, and has no specially designed grooves, slots and holes. Therefore, the manufacturing process is relatively easy, stable and easy to popularize and apply.