[opendtv] Re: 100 Gb/s Ethernet over AM fiber
- From: "John Willkie" <JohnWillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 29 Sep 2005 17:09:18 -0700
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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