Slashdot Mirror
Internet Heading to Light Speed
dbaker writes "Wired Magazine has a very interesting article about the future of optical networks and the barriers we face before this technology is commonplace."
← Back to Stories (view on slashdot.org)
← Back to Stories (view on slashdot.org)
The gluing process creates a material composed of larger electron-rich molecules with sufficient power to cause light that passes through to control the direction of other light, providing the switching capability, Sargent said.
With switching occuring at the speeds available through a layer such as that, there would be an incredible decrease in cumulative latency across the 'net. That is, if all or most of the switches are as above.
Superconnect's Lehenbauer agrees that "it's fascinating" to have material for an optical switch, but warns "it could be awhile until an all-optical network is possible."
I wonder what the cost of those type "devices" will be - both direct in terms of the devices and indirect in terms of whatever infrastructure is required to implement them. Well, either way, it's great sounding technology.
Cheers,
Erick
http://www.busyweather.com/
Can we have universal access and better content first please?
-Johan
PS> Oh yeah, contribute to wikipedia.
Whats the point of blazing high speeds without the content???
..
Net's content value improvement rate is trending downwards
Call me when they reach ludicrous speed. Here's hoping the data doesn't all turn to plaid;-)
If brevity is the soul of wit, then how does one explain Twitter?
A Beowulf Cluster of.....
AAAARRRGHH! My Eyes!!
I few weeks ago I saw that Verizon is starting with some 15mbps lines in Kellar, Texas.
http://news.com.com/Verizon's+fiber+race+is+on/210 0-1034_3-5275171.html
I heard the price was going to be only 44.95 a month. With this kind of speed VoIP and Video communication, as well as video on demand, finally seem pretty feasible.
Right! Just get a bunch of fibre optic cards and plug a loopback into each of them. Pipe your data into the interface, and it'll go 'round and 'round until you need to access it later.
Need more capacity? Just fashion a longer loopback cable, so it can hold more light.
You think it's hard getting a win32 broadband box on the net now? Wait till there are all-optical switches! You'll be hosed before the light from the screen reaches your eyeballs!
stuff |
Eh? You seem to be very confused. Ethernet is not limited to the dinky little 10/100 network I assume you'r running. The gigabit fiber optic network I've got is also ethernet.
"Have you ever thought about just turning off the TV, sitting down with your kids, and hitting them?"
What we need is Bistromathic signaling tech!
Bye!
SeqBox
MOUNT TAPE U1439 ON B3, NO RING
Superconnect's Lehenbauer agrees that "it's fascinating" to have material for an optical switch, but warns "it could be awhile until an all-optical network is possible." Lehenbauer said switches and routers must identify individual packets and route data intelligently, tasks that are not possible using a simple optical switch. "Unless you have an optical computer inside the switch to make these decisions, you'll still need electronic components."
Therein lies the bottleneck. Unless we develop optical computers (not for a while), we still need electronic switches and computers to analyze the content of the optical data in order to make intelligent decisions as to which direction the data should be channelled to.
Not to minimize the importance of this development, but until we do have optical computers, we are condemned to live life in the slow lane. But then again, someone may think of a clever way around this problem without using optical computers. One never knows.
When using your 100Gb fiber-optic internet at the campgrounds, always practice safety. Surround your network card with rocks to keep the fire from spreading. Be sure when you're done with your internet to put it out with a bucket of water and make sure it has stopped smoking before you leave the area.
Remember what Smokey the Bear says. Only you can prevent your 100Gb fiber-optic internet connection from starting a forest fire.
An Indian-American Hindu committed to non-violent thought/speech/action alarmed by the global explosion of radical Islam
Redundancy may soon be more vital than speed.
Once the internet was designed to withstand problems (a euphemism for a nuclear strike) at multiple nodes but since commercial interest like to keep as many things as possible in one building we see today that a small fire in a maintenance tunnel has a dramatic effect on the over all network latency. There just isn't as much redundancy as there used to be and that may be worse for us all than your download time for SP2.
Bell Labs invented them in 1999.
... as my former advisor Prof K. Likharev used to say. When you send a sharp electrical pulse down a matched transmission line/waveguide it propagates with, you guessed it, speed of light in the medium. If your insulator is the same SiO2 they use for optical fiber you will get the same speed as in the fiber!
;-) ) showed that we could make a 128x128 non-blocking self-routing packet switching matrix at 60Gbps/line that could fit on the palm of one's hand, and after packaging with refrigerator fit on half a rack.
The problem with traditional voltage-based electronics at 40G speeds is that when you drive a SiGi/InP/GaAs transistor that fast it dissipates LOTS of power (measured in Watts per handful of transistors). Moreover, CV^2f/2 power dissipation when you constantly charge/discharge line capacitance to ~1V operating voltage is significant. And of course the maximum operating speed of any substantial logic is determined not by transistor speed but by RC constants of the wiring.
Now, if one departs from traditional transistor logic design, say, to superconductor electronics (which I've spent all my life designing up until the beginning of this year, when my current employer decided to "discontinue that effort"), you can start from a clear sheet of paper. In superconductor case, first of all you lose R in RC, not bad! Second is that when temperatures are that cold, thermal noise (~kBT) is small and operating voltages (pulse amplitudes in our case) could be ~1 mV, not ~1V, and Josephson junctions are pretty happy generating ~1ps wide pulses.
The downside is having to deal with refrigiration, one would not see this technology on the end user's desktop any time soon, but for the telco switching center it is almost doable.
My personal estimates (well, down to the complete circuit diagrams
The "packet" feature is important, often when "optical computing" people talk about their switches they conveniently omit the fact that while switch might be fast enough for some 120GHz of bandwidth the re-configuration of that takes milliseconds (think long-haul traditional SONET lines), we were talking about routing/re-configuration at ~256 bits packet length (think TCP/IP).
Oh, well, it's a pity that I can not work on this stuff now, it was -> |- THIS close to actually coming up with a viable demo/product. Maybe some day...
Paul B.
pbunyk (at) lycos (dot) com
P.S. Google for SFQ/RSFQ for more info
1s. Minimal human decision time. Light travels 3e8m
1e-1s. Minimal human reaction time.
1e-2s. Minimal human recognition (sensory reaction) time.
1e-3s (1ms). Sensible task switching time.
1e-4s. in-task high level function time.
1e-5s. in-task medium level function time.
1e-6s (1us). Single microcontroller instruction; in-task low-level function time.
1e-7s Single high-speed microcontroller instruction.
1e-8s Single low-end CPU or DSP instruction time. Light travels 3m.
1e-9s (1ns) Single modern CPU time, light travels 0.3m
1e-10s A single modern CPU gate reaction time. Light travels 3cm, just above 1 inch.
Using standard $8 24bit ADC you can get down to the 3cm level with a $3 1MHZ microcontroller.
Using 1Gbit interface, your bits moving at light speed are 30cm away from each other.
A 300m LAN won't allow ping roundtrip shorter than 2 microseconds.
A 3000km (global network games) line WILL introduce perceptible delay.
A CPU of 3 GHZ just has to have its cache built in. Memory placed 3cm away causes 1 cycle long request-response roundtrip.
45 5F E1 04 22 CA 29 C4 93 3F 95 05 2B 79 2A B2
The joke's on you. Besides being thought of before (as mentioned by another poster), it's how Cray used to store memory for their super computers. There was a wire that went from the output to the input, and the clock was timed to match the duration of the electron transfer through that wire...