What is the difference between a normal wave and a alien wave? On Tue, Oct 13, 2020, 6:36 AM James Jun <james....@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 > >