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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：2021-04-26 02:51:32
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