Subject: General Tech | March 27, 2013 - 11:01 PM | Tim Verry
Tagged: Internet, hc-pbgf, fiber, data transmission
Transmitting data over optical fiber is one of the fastest methods available, and researchers at the University of Southampton have managed to dial up the speed even further.
Being optical in nature, light is used to transmit data over fiber. The speed of light through a vacuum is 299,792,458 meters per second, but traditional fiber is not nearly that fast due to light traveling approximately 31% slower (206,856,796.02 m/s) through silica glass than a vacuum.
The new fiber employs a hollow design that allows light to travel through air rather than glass while still allowing the cable to bend and twist around corners. The new fiber has been dubbed Hollow Core Photonic Bandgap Fiber, or HC-PBGF, and allows light to travel up to about 298,893,080.63 m/s (~99.7% the speed of light). Currently, the HC-PBGF fiber is still in the experimental phase, but it could have big implications for data centers and HPC server clusters that depend on high bandwidth, low latency connections between individual nodes.
Just how fast is the new HC-PBGF? According to ExtremeTech, a researcher told the site that the new fiber has a total cable throughput of 73.7 Tbps. It transmits 3 modes of 96 channels of 256 Gbps each using a combination of wave division multiplexing and mode division multiplexing. The fiber is 160nm and is noticeably faster than traditional fiber. Additionally, the HC-PBGF has a data loss of 3.5 dB/km which makes it a useful candidate for short runs between nodes or rows of racks, but not yet suitable for longer runs. HC-PBGF will not be blanketing your neighborhood anytime soon, but the research may lead to new optical networking technologies used in the next supercomputer or cloud service, for example.
The full paper can be found here, along with more details over at Ars Technica. Unfortunately, the full paper is behind a paywall but it may be worth seeing your school or work can give you access should you be interested in drilling into the details of the experimental hollow fiber,.
Subject: General Tech | June 3, 2012 - 04:23 AM | Tim Verry
Tagged: verizon, pricing, Internet, fios, fiber, 300mbps
According to sources that talked with The Verge, Verizon is planning on offering faster internet services for its FIOS customers, but the new tiers are going to cost a pretty penny.
Verizon will be upgrading many of its FIOS internet speeds, and the changes are set to go into effect on June 17th. The base 15/5Mbps (download/upload) plan will cost $10 more than the current price of $54.99 at $64.99 a month. The current 25/25Mbps will be upgraded to 50/25 and will not see a price increase–it will continue to cost $74.99. The current 50/20Mbps plan will see a significant speed bump to 150/65Mbps, and it will cost $94.99 a month (no price increase). A new 75/35 speed plan will become available and it will cost $84.99 a month. Finally, the service that readers will be drooling over–the 300Mbps plan–will feature speeds of 300Mbps downloads and 65Mbps uploads. It will cost a hefty $204.99 a month, a price that The Verge notes is a mere $5 more than the 150/35 speed tier that it replaces.
Comcast telco fashion, Verizon has managed to tack on up to three fees including a $5 per month fee for those without a contract, a $5 fee for those that do not subscribe to FIOS phone service, and a $100 fee to install equipment for those that want the upper two speed tiers. Fortunately (sort of...), users can avoid the $100 fee if they are new customers or already subscribe to the company’s 150Mbps tier. Also on the less-than-stellar news front, Verizon will not be upgrading plans for those on VDSL plans (in buildings where Verizon delivers fiber to the premises and uses copper from there to homes–think older apartment buildings). Even worse, VDSL customers will still be subject to the increased pricing although they cannot take advantage of the upgraded speeds.
|Single Family Home||VDSL 1||VDSL 2||2 Year Contract||Month-to-Month Rate|
|3/1 Mbps||3/1 Mbps||3/1 Mbps||$54.99||$59.99|
|15/5 Mbps||10/2 Mbps||15/5 Mbps||$64.99||$69.99|
|50/25 Mbps||20/5 Mbps||20/10 Mbps||$74.99||$79.99|
|75/35 Mbps||30/5 Mbps||50/10 Mbps||$84.99||$89.99|
(Source: The Verge. The 150/65 plan doesn't seem like a bad deal actually, if only I had FIOS in my area!)
So this fiber internet upgrade announcement seems great at first does have a dark side. Some customers will be getting a great deal while others will be getting the short end of the stick. Here’s hoping that you are one of the lucky customers on the middle tiers who have FTTH that get a free speed upgrade! More information on the specifics of this upgrade should be coming later this month.
Subject: Networking | May 24, 2011 - 06:52 PM | Tim Verry
Tagged: networking, Internet, fiber
Using a single laser, scientists were able to encode data and transmit it over 50 km of single-node fiber using “325 optical frequencies within a narrow spectral band of laser wavelengths.” The single laser was capable of handling 26 terabits of information per second in an energy efficient manner, which is equivalent to the amount of data used by 400 million phone calls.
The technique used to encode and decode the optical data is called orthogonal frequency-division multiplexing (OFDM). It is a modulation technology that can be applied to both optical and electrical based transmission methods. The data is broken down into numerous parallel streams of data (using mathematics) that greatly increases the transmission speed and amount of bandwidth available. While electrical/copper based systems are not able to transmit 26 terabits of information using OFDM, optical systems are able encode the amount of data in their experiments without speed restrictions and while using “negligible energy.” Dr. Leuthold stated “we had to come up with a technique that can process data about one million times faster than what is common in the mobile communications world.” Further, his stated that his experiment shows that optical technology still has room for transmission speed improvement, and increases in bit-rate do not necessarily result in higher energy usage.
The important aspect of Dr. Leuthold’s research lies in the energy efficiency inherent in reducing the amount of lasers and fiber nodes required to transmit 26 terabits per second of data. Using simple optical technologies, they are able to greatly increase the amount of bandwidth in a single fiber line. Japanese researchers have been able to achieve 109 terabits per second download speeds; however, they had to use multiple lasers to achieve the speeds. Dr. Leuthold iterated that “it’s the fact that it’s one laser,” as being the important results of his research.
Image courtesy Kainet via Flickr Creative Commons