{"id":45947,"date":"2013-05-30T22:00:41","date_gmt":"2013-05-31T02:00:41","guid":{"rendered":"http:\/\/rbach.net\/blog\/index.php\/"},"modified":"2021-08-03T19:20:46","modified_gmt":"2021-08-03T23:20:46","slug":"when-gige-is-not-enough","status":"publish","type":"post","link":"https:\/\/rbach.net\/index.php\/when-gige-is-not-enough\/","title":{"rendered":"When GigE is not enough"},"content":{"rendered":"

\"When<\/a>New research at Alcatel-Lucent<\/a>‘s (ALU<\/a>) Bell Labs moves the speedometer up to 400 Gbps<\/strong>. Jordan Novet<\/a> explains in the GigaOm<\/a> article, A gigabit is not enough. New research takes us to 400 Gbps.<\/a><\/em> According to the article, the Bell Lab<\/strong> researchers have figured out a way to cancel out the noise inside fiber data transmission<\/a>. They cancel the noise, in the same way, your Bose noise-canceling\u00a0\u00a0\u00a0\u00a0 headphones work, by sending more information to counter the noise of the crying kid in 4-C on Flight 1501.<\/p>\n

\"Phase<\/a>The Bell Labs team calls this “phase conjugation.”<\/strong> According to Nature Photonics<\/em><\/a> (rb- it will cost you $32.00 the read the actual article),<\/em> this means sending two streams of data through a single fiber-optic<\/strong> pipe. Phase conjugation sends \u201ctwin waves<\/strong>\u201d of light (information) down the fiber in opposing phases<\/strong>, rather than just one. Both streams are pulled back together at the destination to compare the streams and remove the noise<\/strong>. The clean output lets Bell Labs crank up the power to drive the signal at higher speeds further.<\/p>\n

Mr. Novet explains that the pairing of signals, in essence, cancels out the ups and downs, peaks and troughs, in physics terms, of data. That means the signal-to-noise ratio<\/a><\/strong> improves, which lets fiber optic communications<\/a> travel farther without more gear along the way to boost the signal. The researchers used this technique to do 400 Gbps across the record distance \"Fiberof over 7,900 miles.<\/p>\n

Lead author Dr. Xiang Liu told BBC News<\/a>, \u201cThis concept, looking back, is quite easy to understand, but surprisingly, nobody did this before.\u201d<\/p>\n

rb-<\/em><\/strong><\/p>\n

Most of the articles are impressed with the distance the Bell Labs researchers were able to achieve. Phase conjugation may eventually allow telcos to deploy trans-continental links or undersea links without having to deploy mid-span signal re-generators.<\/em><\/p>\n

\"Deep<\/a>The GigaOm article points out that speeds faster than 400 Gbps are not unheard of. I have covered the increasing speeds\u00a0here<\/a>, here,<\/a> and here<\/a>. GigaOm points out that researchers have managed to send data at speeds exceeding 100 terabits per second<\/a>, although it wasn\u2019t clear how far the speeds could be sustained. Last year Verizon clocked in<\/a> at 21.7 terabits per second across more than 900 miles of broadband with the help of NEC\u2019s \u201csuperchannels.\u201d<\/em><\/p>\n

The Bell Labs<\/a> researchers have taken a different tack.\u00a0 This is a huge deal because it looks like it’s possible to get higher speeds without replacing hardware at the bottom of the sea.<\/em><\/p>\n

 <\/p>\n

Ralph Bach<\/a>\u00a0has been in IT long enough to know better and has blogged from his\u00a0Bach Seat<\/a> about IT, careers, and anything else that catches his attention since 2005. You can follow him on LinkedIn<\/a>,\u00a0Facebook<\/a>,\u00a0and\u00a0Twitter<\/a>. Email the Bach Seat\u00a0here<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Bell Labs new phase conjugation theory sends 2 data streams through 1 fiber optic pipe and then combined to remove noise to drive the signal faster and farther<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[3044,1653,198,1654,1735,15,594,1652],"class_list":["post-45947","post","type-post","status-publish","format-standard","hentry","category-networking","tag-3044","tag-400-gbps","tag-alcatel-lucent","tag-alu","tag-bell-labs","tag-networking","tag-optical-fiber","tag-signal-to-noise-ratio"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t