[opendtv] Re: 100 Gb/s Ethernet over AM fiber
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 3 Oct 2005 16:24:48 -0400
I believe "ternary" is the term used to describe three-level coding. Al
Limberg
----- Original Message -----
From: "John Willkie" <JohnWillkie@xxxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Thursday, September 29, 2005 8:09 PM
Subject: [opendtv] Re: 100 Gb/s Ethernet over AM fiber
> I always thought that three level coding was called trinary; what does
> dou-binary do that trinary didn't?
>
> John Willkie
> ----- Original Message -----
> From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
> To: <opendtv@xxxxxxxxxxxxx>
> Sent: Thursday, September 29, 2005 2:34 PM
> Subject: [opendtv] 100 Gb/s Ethernet over AM fiber
>
>
> > Awright! So far, they are only talking about 3-AM
> > over fiber. Can 64-QAM or 8-VSB be far behind?
> >
> > Note that another approach is to use fancy
> > equalizers to achieve the same bit rate with less
> > efficient NRZ signaling. Next step: fancy equalizer
> > *and* 8-VSB.
> >
> > Ain't this stuff great? Whoever said that high
> > tech equalizers aren't necessary.
> >
> > Bert
> >
> > --------------------------------------
> > Bell Labs discloses 100-G Ethernet over optical
> >
> > Loring Wirbel
> > (09/29/2005 3:57 PM EDT)
> > URL: http://www.eetimes.com/showArticle.jhtml?articleID=3D171201839
> >
> > COLORADO SPRINGS, Colo. - Lucent Bell Labs presented
> > two papers at the European Conference on Optical
> > Communication detailing work on optical transmission
> > using the emerging 100-Gbit Ethernet standard. While
> > Ethernet framing has been used in 40-Gbit Sonet
> > backbones, and the IEEE has discussed a 100-Gbit
> > follow-on, the work described at the conference in
> > Glasgow, Scotland, is the first to allow 100-Gbit
> > transmission over optical fiber.
> >
> > The first paper covers duobinary optical modulation,
> > a technique that forms the basis of a new multisource
> > agreement on transponders. In the methodology, three
> > electrical signal levels are used to represent a
> > traditional binary signal, allowing a transmission to
> > require less bandwidth than nonreturn-to-zero (NRZ)
> > coding. Bell Labs employees used a 40-Gbit optical
> > modulator with duo-binary to achieve a 107-Gbit/s
> > serial data stream.
> >
> > The second paper described a single-chip optical
> > equalizer that compensates for all intersymbol
> > interference encountered in a 107-Gbit NRZ electronic
> > time-division multiplexing transmitter. As with the
> > duo-binary device, the equalizer allowed the use of a
> > commercial 40-Gbit modulator to general a 107-Gbit
> > optical NRZ signal.
> >
> > All material on this site Copyright 2005 CMP Media LLC.
> > All rights reserved.
> >
> >
> >
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