{"id":23601,"date":"2020-08-15T08:02:08","date_gmt":"2020-08-15T07:02:08","guid":{"rendered":"https:\/\/www.ispreview.co.uk\/?p=23601"},"modified":"2020-08-15T08:02:08","modified_gmt":"2020-08-15T07:02:08","slug":"london-uk-team-achieves-record-178tbps-single-fibre-speed","status":"publish","type":"post","link":"https:\/\/www.ispreview.co.uk\/index.php\/2020\/08\/london-uk-team-achieves-record-178tbps-single-fibre-speed.html","title":{"rendered":"London UK Team Achieves Record 178Tbps Single Fibre Speed"},"content":{"rendered":"<p>Scientists at the Optical Networks division of <a href=\"https:\/\/www.ucl.ac.uk\/electronic-electrical-engineering\/research\/optical-networks\" target=\"_blank\" rel=\"noopener noreferrer\">University College London<\/a> (UCL) have successfully used experimental &#8220;<em>hybrid discrete Raman and rare-earth doped fibre amplifiers<\/em>&#8221; to achieve a record single core, single mode fibre throughput (net) speed of 178.08 Terabits per second over a distance of 40km.<!--more--><\/p>\n<p>As the <a href=\"https:\/\/discovery.ucl.ac.uk\/id\/eprint\/10106444\/1\/PTL_paper-30.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">research paper<\/a> explains, the maximum data throughput in a single mode optical fibre is a function of both the signal bandwidth and the wavelength-dependent signal-to-noise ratio (SNR). Scientists are forever pushing the boundaries of performance on optical fibre cables forward and the latest one from UCL involves highly efficient amplifiers to &#8220;<em>enable wide-band signal gain, without spectral gaps between amplification bands<\/em>.&#8221;<\/p>\n<p>The work ultimately resulted in a record transmission throughput for a single core, single mode optical fibre, using a continuous, ultra-wideband (16.83THz) transmission window. The previous record for such a cable at a distance of 40km and using the S,C and L bands was set at an already highly impressive 150.3Tbps, while the new setup hit a net throughput of 178.08Tbps.<\/p>\n<p>A fairly new method of Pilot-based Digital Signal Processing (DSP) was also used in the setup, which was created last year by a different team of researchers.<\/p>\n<blockquote class=\"bq1\"><p><strong>Short Technical Summary<\/strong><\/p>\n<p>We describe the widest continuous coherent transmission bandwidth experimentally demonstrated to date of 16.83 THz, achieved by simultaneously using the S-, C- and L-bands. The variation of fibre parameters over this bandwidth, together with the hybrid amplification method result in a significant SNR wavelength-dependence. To cope with this, the signal was optimised for each SNR, wavelength and transmission band.<\/p>\n<p>By using a system-tailored set of geometrically shaped constellations, we demonstrate the transmission of 660 \u00d725 GBd channels over 40 km, resulting in a record single mode fibre net throughput of 178.08 Tbit\/s.<\/p><\/blockquote>\n<p>The research team, based out of a lab in Bloomsbury, was led by <strong>Dr Lidia Galdino<\/strong> who said (<a href=\"https:\/\/www.standard.co.uk\/tech\/london-scientists-build-ultra-broadband-a4524801.html\" target=\"_blank\" rel=\"noopener noreferrer\">Standard<\/a>) they &#8220;<em>managed to achieve the highest bandwidth that has ever transmitted through the internet. I think the societal benefit is clear &#8211; fast internet for all and a more productive economy. It\u2019s important because internet traffic and data has been increasing exponentially over the last 10 years but we have reached the theoretical limit.<\/em>&#8221;<\/p>\n<p>Obviously, you&#8217;re unlikely to see this sort of speed being delivered to homes anytime soon, but it is the sort of development that&#8217;s likely to be harnessed in the future for boosting the performance of longer international and national fibre routes. The ability to carry more data down existing cables also tends to result in cheaper capacity from suppliers, which ultimately benefits everybody. Well done.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Scientists at the Optical Networks division of University College London (UCL) have successfully used experimental &#8220;hybrid discrete Raman and rare-earth doped fibre amplifiers&#8221; to achieve a record single core, single mode fibre throughput (net) speed of 178.08 Terabits per second over a distance of 40km.<\/p>\n","protected":false},"author":1,"featured_media":23602,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[52,56,477],"class_list":["post-23601","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uk_isp_news","tag-fibre-optic","tag-fttp","tag-science"],"share_on_mastodon":{"url":"","error":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>London UK Team Achieves Record 178Tbps Single Fibre Speed - 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