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Scientists In Japan Build 100Gbps Wireless Network Using Terahertz Transmitter
Mark.JUK writes: A group of Japanese scientists working on a project managed by Hiroshima University claim to have successfully built a Terahertz (THz) transmitter, which is implemented as a silicon CMOS integrated circuit and can transmit a signal running at 10Gbps per data channel over multiple channels in the 275-305GHz band for a top speed of 100Gbps (Gigabits per second). But crucially nobody has mentioned the distance at which this speed could be achieved, particularly since the THz band isn't likely to have much of a reach. It also sits very close to the region used by lasers.
TIL lasers have their own band in the EM spectrum.
How can I believe you when you tell me what I don't want to hear?
It also sits very close to the region used by lasers.
Within firing range?
Knowledge is how to play a game, intelligence is how to win, wisdom is knowing what game to play.
>Which laser operates at 300 GHz?
Masers
.
I should use this sig to advertise my book ISBN-13 : 978-1501515132.
throw in a running microwave oven and at a distance of 1/2 mile.
It sounds wonderful but will it cook my turkey if I leave it on the window sill?
Maybe this is more useful for direct data links? Might be a good way to send data across the ocean.
love is just extroverted narcissism
It's not really a Laser then if it's a Maser.
Same principle of operation, but it's reasonable to expect light to come out of a laser, yes.
I should use this sig to advertise my book ISBN-13 : 978-1501515132.
Did you ever hear about quadrature modulation?
I seem to remember a publication in Nature from 2013. Seems the Germans already did something comparable a few years ago. Over 20m distance that is.
4G has offered these speeds for years between cell towers. For individual towers, it gets split among all users and phones, which also don't use enough power to upload at the same speed and range as the tower. But a THz transmitter sounds interesting. Anyone know if the propagation would be better/worse? I would imagine worse?
That sampling theorem got blown out by any real audio technician that uses pitch-shifting.
That theorem is NOWHERE CLOSE to being adequate for any situation where pitch-shifting is a requirement. You need at least 32x the sampling rate to achieve near-flawless pitch-shifting up or down to a MEASLY TWO WHOLE NOTES, NO MATTER WHAT THEIR FREQUENCY RANGE.
I've proven it with .FLAC files, .RAW files, .WAV files, and .PCM files, across every pitch-shifting plugin known for the most popular media players.
Shannon-Nyquist are old-age. Time for a new theorem.
Still waiting on Serviscope_minor to wake up to fucking reality and realize that Jessica Price isn't going to fuck him.
That doesn't actually preclude physics. We can get multiple bits of information from a single photon. QAM, frequency, phase-shift, etc. The theorem still holds across almost every perceivable 'sound effect' until you get to the matter of pitch shifting, in which case, even with the minimum 2x sampling rate, the reality is that you need about 32x that amount to get an accurate signal representation that won't distort across a wide range of frequency shifts.
There's a reason Nyquist-Shannon has a "THEOREM" instead of a "LAW."
Still waiting on Serviscope_minor to wake up to fucking reality and realize that Jessica Price isn't going to fuck him.
100 Gbps is roughly 14 gigabytes per second. So I would use up my 5GB monthly Verizon cap in about 1/3 a second, then begin racking up $10 /gig overages at $140/s.
(-1: Post disagrees with my already-settled worldview) is not a valid mod option.
Yes, I agree with you. The only possible explanation that I can come up with is that they must have dubbed the next order of ten over EHF as "The Terahertz Band". If that's the case, it needs a better name. If we are to assume that they are keeping with the general pattern used for radio signals, then this band would go from 300 GHz to 3 THz.
This would be an extension of the standard used to class radio waves into bands of an order of ten, which gives us VLF (9-30 kHz), LF (30-300 kHz), MF (300-3000 kHz), HF (3-30 MHz), VHF (30-300 MHz), UHF (300-3000 MHz), SHF (3-30 GHz) and EHF (30-300 GHz). VLF is truncated because EM waves below 9 kHz aren't considered radio. The lower ones are sometimes also called by wavelenth rather than frequency, so VLF-HF may also sometimes be called VLW, LW, MW, SW, though these are usually spoken full-length, e.g. "short wave".
Back on topic, I'll repeat: it needs a better name. EHF stands for "Extremely High Frequency" . . . what's more extreme than extreme? Hyper, maybe? HHF?
www.wavefront-av.com
Light can travel 3000 miles (across the country) in about 16 milliseconds (source: the Google) so unless you're complaining about latencies in that range, i don't think the speed of light is your problem. The packets being caught and retransmitted by many devices along the way is much more responsible for the latency.
The English word "speed" can be used to represent bandwidth or latency depending on the speaker. Possibly even a hybrid combination of the two.
Speed is just a rate at which you can do something. It takes on difference meaning depending on what the something is.