Data-Recovering LSI offers decision-point optimization.
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Press Release Summary:
Data-recovering large scale integrated circuit (LSI) incorporates 40 Gbps signal-waveform monitor circuit and adaptive data-decision control scheme, which continuously optimizes decision point in distorted signal waveform. Together, these features achieve correct recovery of digital information from input data signal waveforms with complex and time-varying distortion caused by impairments such as optical fiber dispersion or receiver-circuit speed limitation.
Original Press Release:
NEC Develops World's First Data-recovering LSI with Waveform Detection and Automatic Decision-point Optimization Capability
Enables higher receiver performance of 40Gbps and beyond optical transmission systems
TOKYO and SAN FRANCISCO, Feb. 5 -- NEC Corporation today announced that it has succeeded in the development of a new data-recovering large scale integrated circuit (LSI), which will enable substantial improvement in data-receiving performance of 40 gigabits per second (Gbps) and beyond optical fiber transmission systems. This is the world's first(1) chip to incorporate an adaptive data-decision control scheme and novel 40Gbps signal-waveform monitor circuit technology. These new features together achieve correct recovery of digital information from input data signal waveforms with complex distortion caused by impairments such as optical fiber dispersion or receiver-circuit speed limitation. The new LSI is also expected to contribute to the realization of future 100Gbps optical transmission systems.
Rapid proliferation of the internet worldwide is generating increasingly high demand for telecommunication networks boasting higher data transmission capacity. Higher capacity also will be vital to the realization of next-generation networks (NGNs) that facilitate multiple services on a single platform. To meet these demands, backbone optical fiber networks have been forced to enlarge their data rate from the 10 Gbps of conventional systems to 40 Gbps.
However, at a higher data rate, the signal waveform suffers from increased distortion arising from optical fiber dispersion and speed limitation in electrical circuits. Moreover, long-distance optical fiber transmissions of 40Gbps and beyond generate even more complex waveform distortion, which rapidly and randomly varies over time. Therefore, it is becoming exceedingly difficult to correctly recover data from input signals.
NEC has succeeded in solving this issue through the implementation of a new signal-recovering technique into an LSI, whose features include:
(1) A 40Gbps high-speed, high-precision signal-waveform monitor circuit to detect complex and time-varying signal distortion.
(2) An adaptive data-recovering scheme that continuously optimizes the decision point in distorted signal waveform through feedback from the waveform monitor circuit.
These features combine to achieve precise and stable recovery of data, even from input signals with highly complex and time-varying distortion. Moreover, the high data-recovery performance of the newly developed LSI is not affected by variation in the operating condition. This enables maintenance-free operation, which will achieve a reduction in the cost of 40 Gbps transmission systems.
NEC will continue to develop this research toward realization of high-performance and low-cost 40Gbps and beyond data-link systems. The results of this research will be presented on February 5 at the International Solid-State Circuit Conference (ISSCC) 2008, February 3 to 7 in San Francisco, California, U.S.A.
(1) According to NEC independent research.
About NEC Corporation
NEC Corporation is one of the world's leading providers of Internet, broadband network and enterprise business solutions dedicated to meeting the specialized needs of its diverse and global base of customers. NEC delivers tailored solutions in the key fields of computer, networking and electron devices, by integrating its technical strengths in IT and Networks, and by providing advanced semiconductor solutions through NEC Electronics Corporation. The NEC Group employs more than 150,000 people worldwide. For additional information, please visit the NEC home page at: http://www.nec.com/
CONTACT: Kazuko Andersen of NEC Corporation of America, +1-646-417-1403, kazuko.andersen@necam.com; or Diane Foley of NEC Corporation, +81-3-3798-6511, d-foley@ax.jp.nec.com
