[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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