ODN中光纤的宏弯损耗对ONU弱光的影响

Influence of macro bend loss of optical fiber on optical attenuation of ONU in ODN

本文通过对ONU弱光的ODN链路衰耗进行分析,发现ODN链路的下行衰耗严重超标的现象,在用OTDR进行故障定位并测试光纤在相应波长的宏弯损耗后,得出光纤的宏弯损耗是导致ODN链路下行衰耗超标的原因,进一步对ODN链路的入户段光缆进行衰耗测试,从而验证了宏弯损耗是引起ONU弱光的主要原因。

Through the analysis of ODN link attenuation with high optical attenuation of ONU,it is found that the downlink attenuation of ODN link exceeds the standard seriously.After using OTDR to locate the fault and test the macro bend loss of optical fiber at corresponding wavelength,it is concluded that the macro bend loss of optical fiber is the cause of ODN link downlink attenuation exceeding the standard;further,the attenuation test is conducted for the optical cable in the home section of ODN link.It is verified that the macro bend loss is the main reason for the high optical attenuation of ONU.