文件名称：测试设置 光纤衰减测试设置-OTDR知识详解
文件大小：1.53MB
文件格式：PPT
更新时间：2024-05-15 20:38:12
OTDR
测试设置 光纤衰减测试设置 双端测试 测试总衰耗 测试参数设置 两步法测试(IEC 874-1 建议 6) 270 Hz 1300 nm PERM - 28.73 dB passing light technique (CW-method) - using OLTS (optical loss test set) stabilized light source (LD,LED) sends out constant output power level (CW) or low frequency modulated light (270, 330, 1000, 2000 Hz) PIN-photodiode detects the light and measures the average power level - access to both fiber ends necesarry - most accurate measurements method - evaluates the complete loss of the link or with a coupler built in the overall backreflection value - measurements have to be performed in two steps