GOLFnSUN
Enjoy the sun
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join:2002-03-03
Avalon, NJ
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2 edits | reply to Anonymous_
Re: wireless
said by Anonymous_  :fiber? 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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en102
Canadian, eh?
join:2001-01-26
Valencia, CA
·RoadRunner Cable
 ·DSL EXTREME
| 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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Mike
Premium,Mod
join:2000-09-17
Pittsburgh, PA
clubs:   | Oh sweet. A long range bug zapper / porn downloader.
Always wanted one. |
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chucky5150
Divers do it Deeper
join:2001-11-03
New Iberia, LA
clubs:
| reply to en102
Re: wireless
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
clubs: | reply to GOLFnSUN
That list of bullets looks strikingly familiar to Wikipedia... |
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GOLFnSUN
Enjoy the sun
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join:2002-03-03
Avalon, NJ
·Sprint Mobile Broa..
·Comcast
| reply to Mike
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.
»www.youtube.com/watch?v=S2rtmoSuoL4
Watch 30 secs to 90 secs in to the video.
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My BLOG .. .. Internet News .. .. My Web Page
Ask yourself one question: 'Do I feel lucky?' Well, do ya punk? |
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The Folsom
Kindly Shut Your Noise Hole.
Premium
join:2003-01-31
Yucaipa, CA
 ·Verizon FIOS
| said by GOLFnSUN :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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digitalfreak
join:2005-12-09
49533
1 edit | reply to GOLFnSUN
said by GOLFnSUN :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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