Routed optical networks

Tue May 2 21:11:36 UTC 2023

>
> I’ve seen proposals for an LSR MPLS/ROADAM type solution, where imagine
> you are at a hop where in a long distance system solution, you would end up
> with OEO, but instead you get directionality capability with an IP/MPLS
> capable device.  As mentioned previously, the 400-ZR/ZR+/ZR-Bright/+0
> optics are the latest example of that.
>

Jared, I understand your point in the above statement to be that
directionality is cost-effectively implemented through label-switched
paths,
rather than (ROADM-enabled) optical path switching.

Do I understand right?

Thank you.

Etienne

On Tue, May 2, 2023 at 9:33 PM Jared Mauch <jared at puck.nether.net> wrote:

>
>
> > On May 2, 2023, at 2:29 PM, Etienne-Victor Depasquale via NANOG <
> nanog at nanog.org> wrote:
> >
> > On Mon, May 01, 2023 at 02:56:47PM -0600, Matt Erculiani wrote:
> > > In short, the idea is that optical networks are wasteful and routers
> do a
> > > better job making more use of a network's capacity than ROADMs. Take
> the
> > > extra router hop (or 3 or 8) versus short-cutting it with an optical
> > > network because the silicon is so low-latency anyway that it hardly
> makes a
> > > difference now. Putting more GBs per second on fewer strands means
> saving a
> > > lot of money on infrastructure costs.
> >
> > This is a very convoluted way of backing into the ole packet-switched
> > vs. circuit switched decision.
> >
> > I don't follow.
> > While ROADMs can be thought of as circuit-switchers,
> > the number of concurrent clients and switching latency put ROADMs on a
> different operational level than packet switchers, right?
>
>
> I’ve seen proposals for an LSR MPLS/ROADAM type solution, where imagine
> you are at a hop where in a long distance system solution, you would end up
> with OEO, but instead you get directionality capability with an IP/MPLS
> capable device.  As mentioned previously, the 400-ZR/ZR+/ZR-Bright/+0
> optics are the latest example of that.
>
> I know of a few companies that have looked at solutions like this, and can
> expect there to be some interesting solutions that would appear as a
> result.  Optical line systems tend to have pretty low power requirements
> compared to a router, but some of the routers are getting pretty low power
> as well when it comes to the power OPEX/bit, and if you have the ability to
> deliver services as an integrated packet optical you could see reduced
> costs and simplified components/sparing.
>
> I’ll also say that I’ve not yet seen the price compression that I had
> expected in the space yet, but I figure that’s coming.  We are seeing the
> bits/watt ratio improve though, so for the same or less power consumption
> you get more bits.  Some of this technology stuff is truly magical.
>
> - Jared

-- 
Ing. Etienne-Victor Depasquale
Assistant Lecturer
Department of Communications & Computer Engineering
Faculty of Information & Communication Technology
University of Malta
Web. https://www.um.edu.mt/profile/etiennedepasquale
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