In reply to a post by candlerb:

In reply to a post by ft247:

Multiplexing GPON and XGS-PON is possible as they use different wavelengths - but I would say that should be achieved at the exchange using WDM kit

Indeed, I believe that's what is done. It's easy to manage as it's all done exchange-side; and it avoids having to allocate a second fibre all the way to every splitter.

Insertion loss is also a consideration. Think about the light coming from an end-user ONT; if it were split 50/50 between two splitter legs then that's a minimum 3dB loss. That's not "half the optical budget", but it's still a significant loss.

Had a look online and Huawei do make ‘CSHD’ 8-port and ‘CSHF’ 16-port OLT line cards for their MA5800 series OLT that are GPON/XGSPON capable on all cages.

There are corresponding combo SFP+ modules (from HiSilicon the Huawei in-house silicon fab) that have parallel GPON and XGSPON interfaces and the FWDM built into the SFP+ package for all four wavengths.

http://www.o.hisilicon.com/-/media/HisOe/Products/Pr...