Passive Wave Primer
Brandon Martin
lists.nanog at monmotha.net
Tue Oct 13 20:22:23 UTC 2020
On 10/13/20 4:01 PM, Mike Hammett wrote:
> It seems incredibly simple to do, depending on the capabilities of your
> platform.
>
> What am I missing?
If the span between the mux/demux pair is entirely passive, it's fairly
straightforward. That's going to limit distances to around 80km or so
with conventional systems or maybe 120km with systems designed entirely
around modern coherent optics.
If there are photonic devices in the span, you now have
customer-supplied light being part of the rainbow that those photonics
have to handle. Balancing things at amplifiers requires careful
coordination with the customer (or adding a separate managed/monitored
VOA for each alien wave which somewhat defeats the point). You end up
with a scenario where a customer can do something screwy and potentially
affect other waves on potentially multiple spans which your big-name
carriers are obviously completely freaked out by.
It's obviously possible, but the operational headache seems large enough
that the major mid-haul and long-haul carriers I've talked to (all North
America and all midwest, for that matter), don't seem to want to sell it
despite all the major optical transport platform vendors not just
supporting it by heavily pushing it.
I really do hope it becomes a real product that I (as a smaller, local
island operator) can buy, but it just doesn't seem to be there yet at
least in my region.
--
Brandon Martin
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