Significant breakthroughs in path to enabling 100 Gigabit Ethernet transport
using single-chip optical equalizer and optical duobinary modulation
MURRAY HILL, N.J. and GLASGOW, Scotland, Sept. 29 /PRNewswire-FirstCall/ -
- In two papers presented to the European Conference and Exhibition on Optical
Communication (ECOC) in Scotland today, Lucent Technologies (NYSE: LU) Bell
Labs announced the first reported transmissions of 100 Gigabit per second
(Gb/s) Ethernet over optical. These results are a significant milestone in
the industry's march towards migrating to 100Gb/s data networking.
"This work is a major first. We have broken through the ceiling in
transmission rates and described two techniques that could help implement 100G
Ethernet over optical systems," said Martin Zirngibl, director, Bell Labs.
"With more and more enterprises moving to 10Gb/s transmission, carriers are
looking to implement 100Gb/s Ethernet in the Metro Area Network (MAN) as a
way to efficiently multiplex and transmit high amounts of data in its native
Ethernet format."
Today, Ethernet signals are transported over 10Gb/s and, occasionally,
over 40Gb/s SONET connections. This Bell Labs work is aimed at producing
100Gb/s Ethernet-over-optical transmission.
The Bell Labs research team was able to deliver a 107 Gb/s optical data
stream, representing 100 Gb/s of data transmission plus a standard 7 percent
overhead for error correction, using the following two technological
approaches:
* Duobinary Signaling: This technique uses three electrical signal levels,
- positive, negative and zero - to represent a binary signal for
communications transmission. Duobinary signals require less bandwidth
than traditional NRZ (non-return to zero) signals. The application of
this bandwidth-compressing format enabled the creation of an optical
107-Gb/s serial data stream using a commercially available optical
modulator (rated for 40 Gb/s).
* Single-Chip Optical Equalizer: Integrated optical equalizers invented by
Bell Labs researchers two years ago, can compensate for transmission
impairments and also for the limited modulator bandwidth in a
commercially available NRZ system. NRZ is the least complex optical data
format to generate. In order to demonstrate an optical 107-Gb/s NRZ
signal, Bell Labs designed a single chip optical equalizer that
compensated for almost all inter-symbol interference arising from
modulator bandwidth limitations in an optical 107 Gb/s NRZ electronic
time division multiplexing (ETDM) transmitter. As with the duobinary
approach, Bell Labs researchers used a commercially available 40-Gb/s
optical modulator in combination with the optical equalizer to generate
a 107-Gb/s optical NRZ data stream.
The ECOC-submitted papers on both of these approaches are available upon
request by sending an e-mail to pbenedict@lucent.com.
About Bell Labs
Bell Labs, the R&D division of Lucent Technologies, is the leading source
of new communications technologies. It has generated more than 30,000 patents
since 1925 and has played a pivotal role in inventing or perfecting key
communications technologies, including transistors, digital networking and
signal processing, lasers and fiber-optic communications systems,
communications satellites, cellular telephony, electronic switching of calls,
touch-tone dialing, and modems. Bell Labs scientists have received eleven
Nobel Prizes in Physics, nine U.S. National Medals of Science and eight U.S.
National Medals of Technology(R). For more information about Bell Labs, visit
its Web site at http://www.bell-labs.com .
About Lucent Technologies
Lucent Technologies designs and delivers the systems, services and
software that drive next-generation communications networks. Backed by Bell
Labs research and development, Lucent uses its strengths in mobility, optical,
software, data and voice networking technologies, as well as services, to
create new revenue-generating opportunities for its customers, while enabling
them to quickly deploy and better manage their networks. Lucent's customer
base includes communications service providers, governments and enterprises
worldwide. For more information on Lucent Technologies, which has
headquarters in Murray Hill, N.J., USA, visit http://www.lucent.com .
http://www.prnewswire.com/cgi-bin/stories.pl?ACCT=104&STORY=/www/story/09-29-2005/0004134866&EDATE=
using single-chip optical equalizer and optical duobinary modulation
MURRAY HILL, N.J. and GLASGOW, Scotland, Sept. 29 /PRNewswire-FirstCall/ -
- In two papers presented to the European Conference and Exhibition on Optical
Communication (ECOC) in Scotland today, Lucent Technologies (NYSE: LU) Bell
Labs announced the first reported transmissions of 100 Gigabit per second
(Gb/s) Ethernet over optical. These results are a significant milestone in
the industry's march towards migrating to 100Gb/s data networking.
"This work is a major first. We have broken through the ceiling in
transmission rates and described two techniques that could help implement 100G
Ethernet over optical systems," said Martin Zirngibl, director, Bell Labs.
"With more and more enterprises moving to 10Gb/s transmission, carriers are
looking to implement 100Gb/s Ethernet in the Metro Area Network (MAN) as a
way to efficiently multiplex and transmit high amounts of data in its native
Ethernet format."
Today, Ethernet signals are transported over 10Gb/s and, occasionally,
over 40Gb/s SONET connections. This Bell Labs work is aimed at producing
100Gb/s Ethernet-over-optical transmission.
The Bell Labs research team was able to deliver a 107 Gb/s optical data
stream, representing 100 Gb/s of data transmission plus a standard 7 percent
overhead for error correction, using the following two technological
approaches:
* Duobinary Signaling: This technique uses three electrical signal levels,
- positive, negative and zero - to represent a binary signal for
communications transmission. Duobinary signals require less bandwidth
than traditional NRZ (non-return to zero) signals. The application of
this bandwidth-compressing format enabled the creation of an optical
107-Gb/s serial data stream using a commercially available optical
modulator (rated for 40 Gb/s).
* Single-Chip Optical Equalizer: Integrated optical equalizers invented by
Bell Labs researchers two years ago, can compensate for transmission
impairments and also for the limited modulator bandwidth in a
commercially available NRZ system. NRZ is the least complex optical data
format to generate. In order to demonstrate an optical 107-Gb/s NRZ
signal, Bell Labs designed a single chip optical equalizer that
compensated for almost all inter-symbol interference arising from
modulator bandwidth limitations in an optical 107 Gb/s NRZ electronic
time division multiplexing (ETDM) transmitter. As with the duobinary
approach, Bell Labs researchers used a commercially available 40-Gb/s
optical modulator in combination with the optical equalizer to generate
a 107-Gb/s optical NRZ data stream.
The ECOC-submitted papers on both of these approaches are available upon
request by sending an e-mail to pbenedict@lucent.com.
About Bell Labs
Bell Labs, the R&D division of Lucent Technologies, is the leading source
of new communications technologies. It has generated more than 30,000 patents
since 1925 and has played a pivotal role in inventing or perfecting key
communications technologies, including transistors, digital networking and
signal processing, lasers and fiber-optic communications systems,
communications satellites, cellular telephony, electronic switching of calls,
touch-tone dialing, and modems. Bell Labs scientists have received eleven
Nobel Prizes in Physics, nine U.S. National Medals of Science and eight U.S.
National Medals of Technology(R). For more information about Bell Labs, visit
its Web site at http://www.bell-labs.com .
About Lucent Technologies
Lucent Technologies designs and delivers the systems, services and
software that drive next-generation communications networks. Backed by Bell
Labs research and development, Lucent uses its strengths in mobility, optical,
software, data and voice networking technologies, as well as services, to
create new revenue-generating opportunities for its customers, while enabling
them to quickly deploy and better manage their networks. Lucent's customer
base includes communications service providers, governments and enterprises
worldwide. For more information on Lucent Technologies, which has
headquarters in Murray Hill, N.J., USA, visit http://www.lucent.com .
http://www.prnewswire.com/cgi-bin/stories.pl?ACCT=104&STORY=/www/story/09-29-2005/0004134866&EDATE=
