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G.657.A2是一种优化了抗弯性能的全谱单模光纤,和传统的G.657.A1弯曲改善型单模光纤相比,它大幅提升了光纤的抗弯表现。由于这种光纤的性能满足ITU-T G.657.A2标准,同时完全符合ITU-T G.652.D标准,与已经广泛铺设的G.652标准单模光纤能无缝兼容,目前在国内FTTH的建设中得到广泛的应用。但在测试弯曲损耗不敏感G.657.A2光纤1310nm处模场直径时,特别是测宏弯性能优异的G.657.A2光纤时,如果仍然采用针对传统标准G 652光纤测试条件:即在2m试样光纤上绕一半径为30mm圈作为高阶模的滤模器,并不总能有效滤除高阶模,当高阶模未完全滤除时,会出现测试光纤的模场直径比其真实的模场直径偏小的现象。本文通过试验的方法研究分析了高阶模对模场直径的影响和可能的消除办法,多个试验结果表明:图1b和图1c所示两种测试方法完全能够满足国家标准、国际标准的测试要求,且两种方法测试模场直径的均值无显著差异(p<0.05)。由于G.657.A2光纤标准要求λ_(cc)≤1260nm,可以保证22m光纤或光缆试样的“对应截止波长”≤1260nm,故用图1c条件可测得正确的1310nm处MFD值。
G.657.A2 is a full-spectrum single-mode fiber optimized for flexural properties that dramatically improves the bend performance of optical fibers compared to the conventional G.657.A1 bend-improved single-mode fiber. Because this kind of optic fiber performance meets the ITU-T G.657.A2 standard, at the same time fully complies with the ITU-T G.652.D standard, and has been widely laid G.652 standard single-mode fiber can be seamlessly compatible, at present in the country FTTH construction has been widely used. But in the test bending loss insensitive G.657.A2 optical fiber 1310nm mode field diameter, especially when measured G.657.A2 excellent macro-bending performance of the fiber, if still used for the traditional standard G 652 fiber test conditions: that is, at 2m sample fiber around a radius of 30mm circle as a high-mode mode filter, the filter can not always effectively filter out the high-order mode when the filter is not completely removed, there will be test mode fiber field diameter than its true mode field diameter Smaller phenomenon. In this paper, the influence of high-order mode on the mode field diameter and the possible elimination methods are studied and analyzed through the experimental methods. The results of several tests show that the two test methods shown in Fig. 1b and Fig. 1c can fully meet the testing requirements of national standards and international standards, There was no significant difference between the two methods (p <0.05). Since the G.657.A2 optical fiber standard requires λ_ (cc) ≤1260 nm, the “cut-off wavelength” corresponding to 22 “for optical fiber or cable samples can be guaranteed to be” 1260 nm ". Therefore, the MFD value at 1310 nm can be measured with the condition of FIG.