Re: Passive Wave Primer

[TJ Trout <tj () pcguys us>]

What is the difference between a normal wave and a alien wave?

On Tue, Oct 13, 2020, 6:36 AM James Jun <james.jun () towardex com> wrote:

> On Tue, Oct 13, 2020 at 12:27:44PM +0000, Rod Beck wrote:
> > Dear Network Gurus,
> >
> > Looking for a tutorial on passive waves. How it works. Pros and cons. .
>
> Essentially, you're providing a channel off of your DWDM filters for
> someone else to pass light.
>
> Commonly in the market, a "wavelength" product generally isn't a true
> wavelength, especially on long-haul segments.
> The 'wavelength' market really is an evolution of the old SONET market in
> some ways -- carriers will typically light a channel (either in fixed grid
> filter or flex grid) and that single channel is usually an X-gigabaud (e.g.
> 35-95Gbd) that uses coherent modulation on line side for say 200-800Gbps
> and multiplexing for tributary channels (such as TDM) on client side ports
> to break away a 100GE circuit for the customer end-user.
>
> As far as technicalities are concerned, most 'wavelength' products that
> behave as described above, ought to be called "dedicated circuits" or
> "circuit-switched transport" if we're anal about its operating principles.
>
> As for 'true' wavelength service, that brings us to your question:
>
> When you're talking about passive wave or 'alien wave', what you're doing
> is you're providing a wavelength frequency assignment on your photonic
> filter system (a channel on your 100 Ghz fixed grid DWDM filter, or
> bandwidth assignment window on your flex grid ROADM) to the customer, which
> would typically be another network provider, or a very clued enterprise
> customer that wants to run his own optical transport but can't justify the
> economics of full dark fiber over the said span, and doesn't need more than
> <=95Gbd max of modulation bandwidth.
>
> The customer would pass traffic similarly to how you yourself would light
> a channel, installing a coherent transponder for 200-800Gbps wave facing
> the line side, and breaking it out to Nx100GE for end-user traffic.
>
> James