NEC demos Terabit/s Superchannel Transmission over 10,000km

VARINDIA- INDIA'S FRONTLINE IT MAGAZINE

NEC demos Terabit/s Superchannel Transmission over 10,000km

NEC Corporation (NEC) has announced its experimental demonstration of 1.15-Tb/s ultra-long haul optical transmission over 10,000 kilometers using optical superchannel technology. This is believed to be the first instance that a terabit/s channel generated from a single laser source has been transmitted over such a distance. Four superchannels were claimed to be transmitted together by wavelength division multiplexing (WDM) to achieve a total capacity of 4 Tb/s and a spectral efficiency of 3.6 b/s/Hz. The results clearly demonstrate that practical high-capacity transmission for transoceanic communication can be achieved using cost-effective superchannel technology.

Optical superchannels is said to allow phase-locked carriers with independent modulation to overlap in frequency following the principles of orthogonal frequency division multiplexing (OFDM). This is supposed to enable efficient bandwidth utilization, allowing higher spectral efficiency and higher data rate per laser through parallelization. NEC's system uses state-of-the-art hardware and advanced techniques, including optical multi-tone generation, large-core/ultra low-loss fiber, intradyne digital coherent detection, and digital equalization at higher oversampling, along with well-established technologies such as EDFAs and DP-QPSK modulation. The experiment yielded a 2-dB 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, USA and the result was published as a post-deadline paper in the recent Asia Communications and Photonics Conference (ACP 2011) in Shanghai, China, after rigorous scrutiny by the ACP program committee.

Dr. Yasuhiro Aoki, GM, NEC's Submarine Network business said, "This success is another example of NEC's continuing leadership in high capacity, long distance optical communication technologies, following its record achievements of 101.7 Tb/s per fiber for single core fiber transmission, the first terabit field trial with coexisting 100G, 450G and 1T signals on the same fiber, and the highest order QAM optical transmission of 1024QAM."


For More Details See


www.varindia.com

Comments

Post a Comment

Popular posts from this blog

N Chandrasekaran appointed chairman of Tata Sons

Image
The board of directors of Tata Sons, at its meeting has unanimously appointed N Chandrasekaran as executive chairman, Tata Sons. N Chandrasekaran shall take charge from February 21, 2017. The board of Tata Sons said, “Chandrasekaran has demonstrated exemplary leadership as the chief executive officer and managing director, Tata Consultancy Services. We believe he will now inspire the entire Tata group to realise its potential acting as leaders in their respective businesses, always in keeping with our value system and ethics and adhering with the practices of the Tata group which have stood it in good stead.” Chandrasekaran was the chief executive officer and managing director of Tata Consultancy Services since 2009. A Tata lifer, he had joined the company in 1987 and was appointed as a director on the board of Tata Sons on October 25, 2016.
Read more

Fake GST invoice scam; 215 people arrested, ₹700 cr recovered

Image
Fake GST invoice scam; 215 people arrested, ₹700 cr recovered:  The   Directorate General of GST Intelligence (DGGI)   has recovered more than ₹700 crore from the arrested 215 people and in the last two months. The individuals who have been arrested for   GST fake invoice frauds   and are fly-by-night operators who fraudulently avail, pass on and utilize input tax credit (ITC) in multi-layered scams. The GST intelligence authorities have also registered over 2,200 cases and have unearthed more than 6,600 fake   GSTIN   entities. “Out of the 215 arrests so far there are 71 masterminds, 81 proprietors, 36 director/managing directors, 15 partners, 3 CEOs, 6 chartered accountants and one each of company secretary, broker, and GST practitioner,” the statement said.   The recent usage of data analytics, data-sharing and AI along with BAFTA tools has helped the agency to detect fraudsters with precise inputs. The DGGI in its statement also said that the arrested include several managing dir
Read more

Visa buys NFT based CryptoPunk and paid $150,000 in Etherium

Image
Visa buys NFT based CryptoPunk and paid $150,000 in Etherium:  Leader in the digital payments   Visa   has purchased a digital CryptoPunk for $150,000, marking the company's first ever   NFT   purchase. The deal is clearly shows that, Visa is stepping into the world of NFTs with its purchase of   CryptoPunk 7610 .   Going forward, NFTs and Visa to align and integrate them in new brand strategy to gain a sizable market share. However, NFTs have often been compared to physical collectible items like rare trading cards and works of art.   The CryptoPunk 7610, which feBlatures a female punk with a mohawk and large green eyes. "We envision there could be a future where your crypto address becomes as important as your mailing address," Visa's Head of Crypto said.   An NFT - which stands for non-fungible token - is a unique digital asset designed to represent ownership of a virtual item. Unlike bitcoin and other cryptocurrencies, NFTs can’t be exchanged like-for-like with an
Read more