>> Would it be possible to extract via PLL or similar the source clock
>> and use that to modulate the amplifier power?
> Although you can amplify just a single wavelength with an EDFA (has to be in
> the 1550nm range, not 1310nm), most deployments are using EDFAs in a DWDM
> environment. The C
Heath,
> I just had a thought about EFDA - please forgive my lack of
> terminology though, i'll try to explain:
> Say you have signal coming in to EFDA, the signal is just amplified
> (as you said, also noise - the whole source signal).
> Would it be possible to extract via PLL or similar the sour
> Erbium Doped Fiber Amplifiers (EDFAs) do not re-shape or re-time the signals
> (the last 2 R's in 3R -- re-amplification, re-shaping, and re-timing)
Thanks Chris - even more reading to do :) It's interesting stuff
that's for sure.
This is also pretty cool:
http://en.wikipedia.org/wiki/Chirp
Heath,
>> By the way, my recollection is the undersea regenerators do purely optical
>> regeneration.
>> There is no O-E conversions undersea, only at the landing stations and
>> terrestrial components.
>
> I'm not clever enough to know of some way that you could do optical
> regeneration witho
>> What's that quote again...?
>> Oh, that's it: "The more you know, the more you know you don't."
>> It feels very appropriate now :)
> I was wondering for quite some time if there was a scientific term for that
> effect, since many of us seem to run into the opposite quite often. It turns
> out
Dorn Hetzel wrote on 10/04/2010 06:22:58 PM:
> With regards to the Wired Article, I still have my copy of that issue
and
> would consider that article perhaps my favorite magazine article of all
> time.
Same here. A classic.
On 04/10/2010 18:24, Heath Jones wrote:
I'm not clever enough to know of some way that you could do optical
regeneration without converting the signal to electrical and
retransmitting back as optical.. How is that done?
Wikipedia has a useful article on this:
http://en.wikipedia.org/wiki/EDFA
> With regards to the Wired Article, I still have my copy of that issue
> and would consider that article perhaps my favorite magazine article
> of all time.
i too thought that a great article and often point folk to it. sadly,
the copy on the wired web site does not have the figures :(
randy
With regards to the Wired Article, I still have my copy of that issue and
would consider that article perhaps my favorite magazine article of all
time.
On Mon, Oct 4, 2010 at 1:41 PM, Patrick Giagnocavo wrote:
> On 10/4/2010 1:24 PM, Heath Jones wrote:
> >> By the way, my recollection is the und
What's that quote again...?
Oh, that's it: "The more you know, the more you know you don't."
It feels very appropriate now :)
Cheers Patrick for that great info & to everyone who contacted me off-list also!
> A halfway-decent description of the physics of how this is done, is
> covered in Neal S
> By the way, my recollection is the undersea regenerators do purely optical
> regeneration.
> There is no O-E conversions undersea, only at the landing stations and
> terrestrial components.
I'm not clever enough to know of some way that you could do optical
regeneration without converting the
On 10/4/2010 1:24 PM, Heath Jones wrote:
>> By the way, my recollection is the undersea regenerators do purely optical
>> regeneration.
>> There is no O-E conversions undersea, only at the landing stations and
>> terrestrial components.
>
> I'm not clever enough to know of some way that you coul
On Mon, Oct 4, 2010 at 10:24 AM, Heath Jones wrote:
>
> I'm not clever enough to know of some way that you could do optical
> regeneration without converting the signal to electrical and
> retransmitting back as optical.. How is that done?
>
> I'm not sure how it's done in practice, but check out
> By the way, my recollection is the undersea regenerators do purely optical
> regeneration.
> There is no O-E conversions undersea, only at the landing stations and
> terrestrial components.
I'm not clever enough to know of some way that you could do optical
regeneration without converting the
populated with electronics, never mind the tail
sections that assume multiple service providers getting into the act.
Rob? Anyone?
FAC
--- valdis.kletni...@vt.edu wrote:
From: valdis.kletni...@vt.edu
To: Heath Jones
Cc: nanog@nanog.org
Subject: Re: A New TransAtlantic Ca
le service providers getting into the act.
Rob? Anyone?
FAC
--- valdis.kletni...@vt.edu wrote:
From: valdis.kletni...@vt.edu
To: Heath Jones
Cc: nanog@nanog.org
Subject: Re: A New TransAtlantic Cable System
Date: Fri, 01 Oct 2010 10:08:50 -0400
On Fri, 01 Oct 2010 15
http://www.gcmap.com/mapui?P=lga-lhr
--
kris
On Oct 2, 2010, at 7:31 AM, Jon Meek wrote:
> One of the ways that I have tormented WAN vendors over the years is
> with a plot of RTT vs. great circle distance between the end points of
> a circuit. Most RTTs usually sit at some constant offset above
One of the ways that I have tormented WAN vendors over the years is
with a plot of RTT vs. great circle distance between the end points of
a circuit. Most RTTs usually sit at some constant offset above that
Physics limit straight line. Circuits taking a less than ideal have
their RTT far above the
On 2 October 2010 10:52, Rod Beck wrote:
> Is that a straight line calculation or did you take into account that a
> straight line is not the shortest path on a curved surface?
Well that is pretty obvious to most, but no - I didn't go to the
effort of factoring in curvature of the earth - especia
New TransAtlantic Cable System
Yeah, I wonder when we're gonna see cable that's pumped down to a vacuum in
the center? :)
On Fri, Oct 1, 2010 at 10:01 AM, Heath Jones wrote:
> >
> http://finance.yahoo.com/news/Hibernia-Atlantic-to-bw-3184701710.html?x=0&.v=1
> > Rod
> Yeah, I wonder when we're gonna see cable that's pumped down to a vacuum in
> the center? :)
Start pumping.. :)
Actually, to my surprise, the refractive index in air is quite close
to a vacuum - so I figured we could set up a laser link between NY and
London, with 'yo mama' sitting in a boat in
Yeah, I wonder when we're gonna see cable that's pumped down to a vacuum in
the center? :)
On Fri, Oct 1, 2010 at 10:01 AM, Heath Jones wrote:
> >
> http://finance.yahoo.com/news/Hibernia-Atlantic-to-bw-3184701710.html?x=0&.v=1
> > Roderick S. Beck
> > Director of European Sales
> > Hibernia Atl
On Fri, 01 Oct 2010 15:01:25 BST, Heath Jones said:
> > http://finance.yahoo.com/news/Hibernia-Atlantic-to-bw-3184701710.html?x=0&.v=1
> Sales spam - but still - very close to minimum possible latency!
> 3471 miles @ 186,282 miles/s * 1.5 in glass * 2 round trip = 55.9ms.
My first thought is that
> http://finance.yahoo.com/news/Hibernia-Atlantic-to-bw-3184701710.html?x=0&.v=1
> Roderick S. Beck
> Director of European Sales
> Hibernia Atlantic
Sales spam - but still - very close to minimum possible latency!
3471 miles @ 186,282 miles/s * 1.5 in glass * 2 round trip = 55.9ms.
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