  Anonymous_AnonymousPremium
join:2004-06-21
127.0.0.1
kudos:2 | wireless fiber? | |
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 |  Romney2012Defeat Obama 2012-Chg we can believe inPremium
join:2002-03-03
USA
kudos:4
2 edits | Re: wireless No. It is OTA laser communication. No fiber involved.
Distance is limited due to atmospheric conditions and need to maintain eye safety stds.
Things that limit usable distance:
However, for terrestrial applications, the principal limiting factors are:
* Beam dispersion
* Atmospheric absorption
* Rain (lower attenuation)
* Fog (10..~100 dB/km attenuation)
* Snow (lower attenuation)
* Scintillation (lower attenuation) although to a lesser degree in LED Systems
* Background light
* Shadowing
* Pointing stability in wind
* Pollution / smog
* If the sun goes exactly behind the transmitter, it can swamp the signal.
Atmospheric and fog attenuation, which are exponential in nature, limit practical range of FSO devices to several kilometres.
And must meet eye safety stds:
Class 1 & 1M
CLASS 1 LASER PRODUCT
A class 1 laser is safe under all conditions of normal use. This means the maximum permissible exposure (MPE) cannot be exceeded. This class includes high-power lasers within an enclosure that prevents exposure to the radiation and that cannot be opened without shutting down the laser. For example, a continuous laser at 600 nm can emit up to 0.39 mW, but for shorter wavelengths, the maximum emission is lower because of the potential of those wavelengths to generate photochemical damage. The maximum emission is also related to the pulse duration in the case of pulsed lasers and the degree of spatial coherence.
Class 1M
A Class 1M laser is safe for all conditions of use except when passed through magnifying optics such as microscopes and telescopes. Class 1M lasers produce large-diameter beams, or beams that are divergent. The MPE for a Class 1M laser cannot normally be exceeded unless focusing or imaging optics are used to narrow the beam. If the beam is refocused, the hazard of Class 1M lasers may be increased and the product class may be changed. A laser can be classified as Class 1M if the total output power is below class 3B but the power that can pass through the pupil of the eye is within Class 1. | |
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| |  en102Canadian, eh?
join:2001-01-26
Valencia, CA | Re: wireless Mosquitos, birds, and just about anything else that comes between the 2 sites would cause disruption (i.e. as noted smog in southern Calfornia may cause diffraction).
This would be ok to use between lets say a space station and the moon if distance isn't a limitation. Lining it up at those distances would be an issue though.
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Canada = Hollywood North | |
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| | |  MikePremium,Mod
join:2000-09-17
Pittsburgh, PA | Re: wireless Oh sweet. A long range bug zapper / porn downloader.
Always wanted one. | |
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| | | | |  Radio ActiveMy pappy's a pistolPremium
join:2003-01-31
Fullerton, CA | Re: wireless said by Romney2012:said by Mike:Oh sweet. A long range bug zapper / porn downloader. Always wanted one. That reminds me of the film "Real Genius" where a laser fills a house with popcorn when the laser hits a big popcorn ball at the end of the movie. (youtube clip) 30 secs to 90 secs in to the video. "ICE IS NICE!!!" 
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Civil disobedience is still disobedience.
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1 edit | said by Romney2012:said by Mike:Oh sweet. A long range bug zapper / porn downloader. Always wanted one. That reminds me of the film "Real Genius" where a laser fills a house with popcorn when the laser hits a big popcorn ball at the end of the movie. (youtube clip) 30 secs to 90 secs in to the video. LOL You realize you just posted a link to an illegal file on the internet? I guess all that anti-piracy and copyright infringement rhetoric you spew around here only applies to everyone else. | |
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| | |  chucky5150Divers do it Deeper
join:2001-11-03
New Iberia, LA | While watching some show on the Science channel they did in fact send a laser beam from a satellite to earth and were able to transmit information. However, I don't recall what the speeds where.
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Member of the US Air Force since May 7th, 2002 To March 29th, 2005
"You sneak up behind yourself and remove your pants before you realize what's going on." KOL | |
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| | cbiggers
join:2000-08-10
San Luis Obispo, CA | Re: wireless That list of bullets looks strikingly familiar to Wikipedia... | |
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| | | nope - laser. 1.2 terabytes a second. | |
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| | | | Re: wireless 1.2 terabits per second (that's "tera" as in metric/decimal--data comm speeds are measured/represented in decimal/metric and not binary, so orders of 1,000 not 1024, because bits are simply being counted and not being represented as some amount of "storage")
That's 1.2 trillion bits per second. | |
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Reviews:
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TheMGPremium
join:2007-09-04
Canada
kudos:1 | Not very impressive. Essentially what they did is fiber without the fiber. Just beam the laser right through the air. Ok, it's not quite THAT simple, but still, I don't consider that true wireless. | |
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| EPS
join:2008-02-13
Hingham, MA | Re: Not very impressive. Even if the technology isn't RF and is very limited in its applications, 1.2 Terabits is still fairly impressive, I'd think... | |
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| bjbrock
join:2002-10-28
Mcalester, OK | It is exactly 100% wireless. By definition. A laser beam and a radio wave are exactly the same thing - electromagnetic radiation. It doesn't get any more wirless than that. | |
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| bjbrock
join:2002-10-28
Mcalester, OK | Laser and RF are the exact same thing - electromagnetic radiation. That is about as wireless as you can get. | |
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| | silly, just silly. Line of sight lasers, a completely ridiculous concept. Theres way too many things that can disrupt the signal. Maybe this can do better in Arizona...and all the people will walk around with saftey glasses. LOL | |
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|  TCubPremium
join:2008-09-03
Olmsted Falls, OH
kudos:4 | Re: silly, just silly. Why not just send the laser through some sort of pipe or small tunnel. At corners or bends you could use mirrors or something to deflect the light. Instead of worrying about losing your connection due to atmospheric conditions. | |
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| |  r81984Fair and BalancedPremium
join:2001-11-14
Katy, TX
 ·AT&T U-Verse
 ·AT&T DSL Service
 ·row44
| Re: silly, just silly. said by TCub:Why not just send the laser through some sort of pipe or small tunnel. At corners or bends you could use mirrors or something to deflect the light. Instead of worrying about losing your connection due to atmospheric conditions. Or better yet, shoot the laser through small wires of glass.
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»www.ryanoneill.us | |
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| | | | thats what a fiber optic cable is. | |
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1 edit | Re: silly, just silly. No way. It's not possible that that's what he was insinuating at all. | |
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| | Not be be a ass but Where is America is this? Thats right we are playing with caps now we dont need this.  | |
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iansltx
join:2007-02-19
Golden, CO
kudos:2 Reviews:
·Verizon Online DSL
·Comcast
| FSO FTW So we've got Corning bendable fiber (amazingly flexible if you ask me) pushing three terabits per second and this pushing 1.2. The thing is, regular computers can probably only sustain 400 Mbps, and laptops would be more like 300 Mbps. WIth all that leeway, surely you could use FSOs for ultra-high-speed consumer internet in rural areas. Right now these glorified WiFi systems don't do all that great with interference anyway on the 900 MHz or 2.4 GHz bands...even if FSOs allows for 0.001% of their theoretical bandwidth you'd still get a 12 Mbps connection, better than what's currently being piped over copper or coax to most of the US.
Light-based processing, fiber, FSO's...looks like photons are the new electrons. Cool? | |
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|  XBL2009------
join:2001-01-03
Chicago, IL
·EarthLink
·AT&T Midwest
| Re: FSO FTW said by iansltx:So we've got Corning bendable fiber (amazingly flexible if you ask me) pushing three terabits per second and this pushing 1.2. The thing is, regular computers can probably only sustain 400 Mbps, and laptops would be more like 300 Mbps. With solid state hard drives only a couple years away having a 1Gbps network won't seem like a big deal. | |
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| | iansltx
join:2007-02-19
Golden, CO
kudos:2 | Re: FSO FTW True; you can get an SSD now that can do 1Gbps and WD Velociraptors can do the same, but that's the equivalent of 50/20 FiOS right now...too hot to handle considering the cost for people. | |
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 mrchrisOut and aroundPremium
join:2002-10-01
North Babylon, NY | What? The thing is that we don't even have hard drives that can achieve such read and write speeds so what is the point besides LAN stuff and large networks? | |
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| iansltx
join:2007-02-19
Golden, CO
kudos:2 Reviews:
·Verizon Online DSL
·Comcast
| Re: What? Umm...LAN stuff and large networks. If you can get a Tbps back\bone (as opposed to 10 or 40 Gbps right now) you can shoot 4k (2x HD) video through the pipe to consumers all day. Or 1080p HD video all day and all night, at Blu-Ray quality  | |
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| |  johnny_tPremium
join:2004-03-21
Palo Alto, CA | Re: What? Give me 1gb/sec & no caps I'm happy. | |
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| | | | | Re: What? said by johnny_t:Give me 1gb/sec & no caps I'm happy. Amsterdam any1? | |
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| | | Re: What? - Pushing the envelope! If we stop evolving technologically, then there would be even less and less new cool stuff! Just because a hard drive can't achieve these speeds does not mean that there are other applications for this technology. I have installed LightPointe and fSona FSO links before and this applications is not for one pc. Sometimes it is because of cost, other times it is the inability to wait for fiber or copper to be provisioned. | |
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| | so Not everything that is news on this site is for home use. Like one of the posters said above, it can be a great LOS communication for space and the like. | |
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| | | Re: so I can imagine this is the next communication revolution but they have to make it viable. How does a beam of light go the number of things that can get in the way. you would have to put a emense Size satellites with big enough mirrors to bounce the signal lets say from LA to NY. Not to Mention the amount of space debris that can get in the way and the alignment would have to be to a millionth to the inch. You off by a inch you are off a thousand miles. But I do believe its viable the probably the best thing out there for world communication to literally be faster and cheaper. If anyone has ever watched the serious 2054 they gave a quick peak of something like this and i believe it would be cheaper to use a satellite to bounce the beam of light from NY to Beijing then to lay thousands of miles of cable on the sea flow every few years | |
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| | | | Re: so Sound like microwave of old-every time there was fog the office to office trunks (telco) would go crazy-but if they did the laser to last mile it would not be long b4 the kids were flying kites up to block the signal--what fun.
But all research has value! | |
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 maartenaElmoPremium
join:2002-05-10
Orange, CA
kudos:1
·AT&T U-Verse
 ·DIRECTV
| Say we colonize the moon or Mars.... ...Could we use this technology to create a pretty damn fast link between a satellite orbiting Earth, and a satellite orbiting Mars? (Maybe with a relay satellite if Mars and Earth are out of each other's view).
I mean it's pretty easy with a focused radio beam to bring lots of bandwidth up to a satellite, and beam it back down.... see satellite providers, and the ISS internet connection.
But using radio technology all the way to Mars trickles your bandwidth down to less-then DSL speeds at best... which is good enough for current orbital satellites taking pictures of the place, but if we want to setup a serious colony with some serious labs..... we are going to need a way to send over a LOT of data, using a PUSH technology (reply time is 10+ minutes, regular TCP/IP won't work) of some sorts....
I am wondering how much signal degradation there is over such enormous distances.
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Obama 2008 - Because McCain is more of the same! | |
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