I would like to call the TFs attention to great technical results from Vasu and his colleagues because they are easy to miss by being tucked away in the back of a presentation.
A pre-FEC BtB BER = ~1e-8 is reported for new 200G/lane DSP and EML chips assembled in a transceiver. I have encouraged Vasu to submit a more extensive version as a post deadline paper to next year's OFC. Hopefully this will also motivate others to bring in measurements data so that Vasu is not seen as the only one that can do low pre-FEC BER 200G/L.
We have been discussing oFEC and iFEC in the TF for a while. My position has been that if the only measurements showing feasibility are for iFEC
+ oFEC then that's the only spec. we should write, and if we have measurements showing feasibility of only oFEC, then there is no need for a iFEC + oFEC specification.
Given these results, we should consider changing a previous motion that adopted iFEC + oFEC for 800G DR4 (500m) to only oFEC for 800G DR4 (500m). For a variety of reasons, today it still makes sense to keep 800G DR4-2, FR4 and LR4 as iFEC + oFEC.
If we do this, we will have to be careful in adopting a C2M specification, so that whatever we agree to has a good margin against 1e-5 BER maximum. The way we ensure that C2M and optical link can be treated independently is by having lots of margin.
Thank you
Chris
All,
The webpage for the joint IEEE P802.3cw / df / dj Task Force meeting has been updated with nearly all of the technical material for the meeting - https://www.ieee802.org/3/dj/public/23_11/index.html.
Please note that TF and editorial leadership presentations are still pending, as are proposed liaisons, which are all being worked on. Your patience is greatly appreciated.
Also, please be aware that I do not intend to update any technical presentations prior to Sunday before the Plenary.
Regards,
John D’Ambrosia
Chair, IEEE P802.3cw / df / dj Task Forces
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