Yes Alistu, I want to combine the two downstream signal into one. As you can see, there is one CO, having wavelengths of GPON and TWDM PON generated from 2 OLTs inside the central office. 4 wavelengths of TWDM PON are combined using WDM MUX into one signal. Now i want to merge this signal with GPOn’s signal of 1490 nm.
I am not considering the upstream signal at the moment.