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Alcatel-Lucent demos optical networking at 100Gbps

Posted: 03 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:networking solution demo? demultiplexing optical receiver? optical network 100Gbps?

Four networking solutions with enhanced capacity by Alcatel-Lucent's Bell Labs and Research and Innovation teams were demonstrated at this year's OFC/NFOEC conference in Anaheim, California.

The networking solutions include the upgrade of existing 40Gbps transparent long-haul transport networks to 100Gbps Ethernet, the use of coherent detection over conventional direct detection for unmatched resistance to fiber impairments at 40Gbps and the ability to receive and convert serial 107Gbps optical data into lower rate data streams. Alcatel-Lucent also demonstrated the first WDM transmission of channels based on serial binary modulation format exploiting full Electronics Time Domain Division Multiplexing (ETDM).

The first experiment transmitted 10 closely-spaced 100Gbps WDM data channels over a 1,200km optical transmission distance in a systems experiment that included six optical add/drop nodes like those used in today's transparent mesh networks. Using this design, researchers from Alcatel-Lucent's Bell Labs in New Jersey achieved a spectral efficiency of 1bps per Hertz over the 1200km distance using a single polarization of light. According to the company, this demonstrates the practicality of effectively doubling the throughput of today's commercially deployed optical networks, using WDM channel spacings that are typical of existing and deployed 40G networks using optical and electronic components developed for the 40G market.

Another project, this time by researchers at the company's Research and Innovation center in Paris, demonstrated the use of coherent detection to contain distortion and dispersion, which occur when sending WDM channels at 40Gbps rate over links designed for 10Gbps rate. According to the company, the approach enabled the first demonstration of an ultra long-transmission over 4,080kmhighlighting unmatched resistance to fiber impairments, namely PMD and chromatic dispersion, when compared to all other 40Gbps solutions.

Meanwhile, another project of the researchers from Alcatel-Lucent's Bell Labs in New Jersey demonstrated the ability to receive and convert serial 107Gbps optical data into lower rate data streams with the first fully integrated 107Gbps demultiplexing optical receiver. The unique optical receiver integrates a 100Gbps photodetector with a 1:2 electronic demultiplexer in a single high-speed package. At such speeds, packaging the two components in an integrated fashion allows for optimized performance compared to having separate photodetector and demultiplexer modules. This is a significant step towards the commercial realization of 100Gbps serial transmission systems. Such a compact receiver transforms ultrahigh speed optical signals to data rates that are more manageable in the electrical domain.

Alcatel-Lucent's Research and Innovation researchers from Stuttgart on the other hand demonstrated the WDM transmission of 10 channels, each carrying 107Gbps bit rate information over 480km. After a recent single-channel demonstration, this is the first WDM transmission of channels based on serial binary modulation format exploiting full ETDM, both at the transmitter and receiver sides. Based on advanced research electronic circuits that are operating at full line rate, this approach complements the previous ones, preparing the introduction of 100Gbps systems.




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