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研究了用工作频率为120兆赫的TeO_2声-光偏转器判断单模光纤的衰减特性。长度方向的空间缺陷(缺陷位置)和拚接损耗的新的反向散射技术。由于偏转器的插入损耗小、消光比高、反向散射信号的动态范围至少增大了10分贝,与通常利用分束器和偏振器-检偏器蛆合的反向散射技术相比,在光纤损耗为1分贝/千米时,相当于可计量的长度增长了5千米。该技术的另一优点是通过任意切断瑞利散射信号初级中的大功率来避免放大器饱和。对19.2千米长的单模光纤作了试验,获得了长达18.4千米的缺陷定位距离。
The decay characteristics of single mode fiber are studied with a TeO_2 acousto-optic deflector operating at 120 MHz. Longitudinal spatial defects (defect locations) and new backscattering techniques for splice loss. Due to the small insertion loss and high extinction ratio of the deflector, the dynamic range of the backscattered signal is increased by at least 10 dB. Compared with the backscattering technique commonly used with a beam splitter and a polarizer-analyzer, Fiber loss of 1 dB / km, the equivalent of a measurable increase of 5 km in length. Another advantage of this technique is to avoid amplifier saturation by arbitrarily cutting off the high power in the primary Rayleigh scattering signal. A 19.2-kilometer single-mode fiber was tested and a defect-finding distance of 18.4 kilometers was obtained.