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Optical superchannel transmission tops 10,000km

Posted: 12 Jan 2012 ?? ?Print Version ?Bookmark and Share

Keywords:optical transmission? superchannel? transoceanic communication?

NEC Corp. has recently demonstrated a 1.15Tb/s ultra-long haul optical transmission of more than 10,000km using optical superchannel technology. According to the company, this is the first time that a terabit/s channel generated from a single laser source has been transmitted in that distance.

Four superchannels were transmitted together by wavelength division multiplexing (WDM) to achieve a total capacity of 4Tb/s and a spectral efficiency of 3.6b/s/Hz. The results show that practical high-capacity transmission for transoceanic communication can be achieved using cost-effective superchannel technology, noted NEC.

Optical superchannels allow phase-locked carriers with independent modulation to overlap in frequency following the principles of orthogonal frequency division multiplexing (OFDM). This enables efficient bandwidth utilization, allowing higher spectral efficiency and higher data rate per laser through parallelization.

NEC's system uses modern hardware and advanced techniques, including optical multitone generation, large-core/ultra low-loss fiber, intradyne digital coherent detection and digital equalization at higher oversampling, along with technologies such as EDFAs and DP-QPSK modulation. The experiment yielded a 2dB system margin above the hard decision FEC threshold without using processing-intensive MAP or MLSE algorithms.

This work was conducted by NEC Laboratories America, NEC's research group in Princeton, New Jersey, U.S.

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