I looked at this before and go far enough in the conversations with one carrier that had sold this as a product before and had a poor experience with the customers they were no longer offering it. You are likely better off getting a volume deal on waves, which can be had for pretty cheap these days.

I can get 400g waves from carriers now, the capacity involved is short of what makes sense for IRU long haul.

Dark in the metro continues to work out. As Saku mentioned there's significant risks opening up a system even with channel blockers etc to protect each other it hasn't worked out. 

Ask some carriers about a dedicated managed system in your rack if XC fees are killing you. 

Sent from my TI-99/4a

On Jul 20, 2021, at 4:35 PM, Lady Benjamin Cannon of Glencoe, ASCE <lb@6by7.net> wrote:

Does anyone have a comprehensive (or any) list of carriers doing alien wavelengths? (background: https://thecinict.com/2021/03/05/adding-alien-wavelengths/ https://www.ekinops.com/solutions/optical-transport/alien-wavelength )

Emphasis on subsea operators.
—L.B.

Ms. Lady Benjamin PD Cannon of Glencoe, ASCE
6x7 Networks & 6x7 Telecom, LLC 
CEO 
"The only fully end-to-end encrypted global telecommunications company in the world.”
FCC License KJ6FJJ