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Lucent Technologies' Bell Labs Demonstrates First Transmission of 100 Gb/s Ethernet-Over-Optical

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 [e-mail].

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 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.

SOURCE Lucent Technologies

09/29/2005 09:52 ET

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