ODN link downlink attenuation is generally abnormal The GPON network uses 1490nm/1310nm wavelengths for both downstream and upstream, while the ODN (Optical Distribution Network) mainly uses G.652D and G.657A2 fibers, which have attenuation of 0.23dB/km and 0.36dB/km at 1490nm/1310nm wavelengths, respectively, as shown in Figure 1. Therefore, under normal circumstances, the downlink attenuation of the … Continue reading The impact of insufficient fiber bending radius on ODN link attenuation