We sell some wavelengths on passive CWDM/DWDM path's between Datacentres (less than 80Km) to customers to spread the cost of leasing the dark fibre. But yes, as far as long distance (apart from bespoke offerings) I'm yet to see a productised alien wave service. If you are spending all that money on OTN kit the extra cost of the transponders is not really significant I suppose. -----Original Message----- From: NANOG <nanog-bounces+tony=wicks.co.nz@nanog.org> On Behalf Of Brandon Martin Sent: Wednesday, 14 October 2020 8:11 am To: nanog@nanog.org Subject: Re: Passive Wave Primer I have yet to find a service provider that is actually willing to sell this even when they have it in their service offering catalog. The difficulties of coordinating everything with the customer are so extreme that it seems to usually make sense to either lease the customer dark fiber or capitalize the transponders needed to carry it as a managed wave on the provider's transport system. Might make sense if you literally want half the spectrum on a long-haul span or something.