OTDR光纤测试盲区的判断与处理

Judgement and Treatment of Blind Zone in OTDR Optical Fiber Test

虽然目前光时域反射仪(Optical Time Domain Reflectometer,OTDR)拥有了成熟的制造技术,测量精度远超以往,但是却始终无法彻底规避测试盲区。测试盲区的存在,加大了对反射或衰减时间的确定难度,影响光纤的精确定位,阻碍了查找光纤线路故障。因此,分析OTDR测试原理和盲区定义,指出了影响盲区大小的因素,并阐述了盲区的判断与处理方法,以供参考。

Although Optical Time Domain Reflectometer(OTDR)has mature manufacturing technology,its measurement accuracy is far higher than before,but it can not completely avoid the test blind zone.The existence of the test blind zone increases the difficulty of determining the reflection or attenuation time,which causes the precise positioning of the optical fiber to be affected to a certain extent,which hinders the search for the fault of the optical fiber line.This article analyzes the OTDR test principle,the definition of the blind zone,points out the factors affecting the size of the blind zone,and explains the judgment and processing methods of the blind zone for reference.