raythompsontn
join:2001-01-11
Oliver Springs, TN
| reply to ITALIAN926
Re: Brilliant Picture
said by ITALIAN926  :That was such a dumb comment man, its just a green light. When you walk by those fiber Christmas trees , do you hide your eyes ? Do you know that for sure? Have you read about the dangers of green lasers? Infared from those lasers? Fiber does not use "green light". They use lasers, a coherent light source, a highly concentrated light source.
Tell you what. Take a green laser and shine it in your eye. You can still see the keyboard with your one good eye. |
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TheBoz
@insightbb.com | If it was a laser would like you say it was would it not be a point of light and not a big patch of light on face. Its probally LEDs thats being used. IMHO |
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ATTek
Got Sand?
Premium
join:2000-12-13
Pinon Hills, CA
| reply to raythompsontn
said by raythompsontn : Fiber does not use "green light". Incorrect. Any light will travel through a fiber for a short distance. It needn't be a laser. If the pic isn't doctored in some way, then it's likely just a green light to make a nice publicity picture. The Christmas tree question was a valid one......do you really think all of the decorations around that use fiber optic lighting are harmful to your eyes?
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What does THIS button do..... |
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Matt
Take me down to the paradise city
Premium
join:2003-07-20
Jamestown, NC
 ·North State Commun..
| said by ATTek :said by raythompsontn : Fiber does not use "green light". Incorrect. Any light will travel through a fiber for a short distance. It needn't be a laser. If the pic isn't doctored in some way, then it's likely just a green light to make a nice publicity picture. The Christmas tree question was a valid one......do you really think all of the decorations around that use fiber optic lighting are harmful to your eyes? Yep.
Some short distance fiber equipment even uses low-power LED lighting instead of lasers.
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Pretty Fly for a White Guy™ |
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bogey780
join:2004-03-19
Here | reply to ATTek
Having any light source directed into the eyes is not a good idea. Angled light of relativistic ambient intensity is fine but directed light significantly brighter than ambient lighting can be damaging. |
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raythompsontn
join:2001-01-11
Oliver Springs, TN
| reply to ATTek
said by ATTek :said by raythompsontn : Fiber does not use "green light". Incorrect. Any light will travel through a fiber for a short distance. It needn't be a laser. Ok, then try and use "any light" to communicate through a fiber. Laser light is used because it is pure and does not suffer from degradation over distance that "any light" suffers. It is also easy to modulate the light. Try to modulate "any light" and measure your success. Try and get "any light" to travel more than a few feet through a fiber. It ain't gonna work. Again, lasers are used because the diameter of the fiber is matched to the frequency of the laser to reduce losses and interference.
For the photograph they may have used "any light" but the impression is designed to promote fiber communication and that requires a laser modulated beam. |
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raythompsontn
join:2001-01-11
Oliver Springs, TN
| reply to Matt
said by Matt :Some short distance fiber equipment even uses low-power LED lighting instead of lasers. An LED is not just "any light" and in fact produces a narrower spectrum than just "any light".
LED's are indeed used for short length communications. To get the most distance, with minimal losses, requires the much purer light of a laser system. The characteristics of the fiber are matched to the very narrow frequency of the laser. To obtain the speeds mentioned in the article requires a laser, even for the short distances. LEDs would simply not do the job.
Fibers used on Christmas displays are not very powerful, they are not lasers, and certainly do not come close to the affects of a true green laser.
»www.mayoclinic.org/news2005-rst/2800.html
»www.electrooptics.com/features/f···ure_id=6
If you want to know about the dangers of green lasers. A web search will quickly show that green lasers, used improperly, are indeed a significant hazard.
Looking at the output end of a high speed link driven by lasers is just plain stupid. |
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Telukin
Premium
join:2004-03-26
UK | So article about fiber comms (that uses laser) coupled with a stock photo of someone holding some fiber and being illuminated by the light from it means that the light in the photo must be a laser? Come on, lighten up. |
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viperlmw
Premium
join:2005-01-25 | reply to raythompsontn
Ever heard of 'multimode'? It uses LEDs as the light soruce, for short, in building runs, and has a larger core. 'Singlemode' fiber uses lasers. |
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raythompsontn
join:2001-01-11
Oliver Springs, TN
| said by viperlmw :Ever heard of 'multimode'? It uses LEDs as the light soruce, for short, in building runs, and has a larger core. 'Singlemode' fiber uses lasers. Yep. Keyword in all of this is distance. Floor to floor within a building is not much distance. Distance without losses requires closely matched components. |
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raythompsontn
join:2001-01-11
Oliver Springs, TN
| reply to Telukin
said by Telukin :So article about fiber comms (that uses laser) coupled with a stock photo of someone holding some fiber and being illuminated by the light from it means that the light in the photo must be a laser? Come on, lighten up. The implication is there. And leave my weight out of this discussion. |
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hopeflicker
Capitalism breeds greed
Premium
join:2003-04-03
Long Beach, CA
| reply to raythompsontn
said by raythompsontn :said by viperlmw :Ever heard of 'multimode'? It uses LEDs as the light soruce, for short, in building runs, and has a larger core. 'Singlemode' fiber uses lasers. Yep. Keyword in all of this is distance. Floor to floor within a building is not much distance. Distance without losses requires closely matched components. a striking resemblance of user: Signmeuptoo ,»/useremail/u/520600
hummm...
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People pray to God because they're told to. |
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raythompsontn
join:2001-01-11
Oliver Springs, TN
| Not sure what you mean by that comment. Should I be wearing my tinfoil underwear or other such body armor?  |
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NYR 56
join:2000-12-05
Smithtown, NY
clubs:
| reply to hopeflicker
I'm impressed hopeflicker and think you hit the nail on the head. Sounds just like him.
Whoever you are, get a grip. It's obviously not a laser and if you know anything about lasers it wouldn't look like that picture. Also, you have been proved wrong, admit it, instead of rambling on with more technical posts to cover yourself. If you think people are going to go blind over a picture on DSLR then you better hope they don't venture into the rest of the internet either. |
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hopeflicker
Capitalism breeds greed
Premium
join:2003-04-03
Long Beach, CA
| said by NYR 56 :I'm impressed hopeflicker and think you hit the nail on the head. Sounds just like him. Striking, isn't it? 
Never understood why people make more than 1 account on these sites. What do you have to hide 
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People pray to God because they're told to. |
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raythompsontn
join:2001-01-11
Oliver Springs, TN | Well, in this case you would be markedly wrong buttermilk breath. |
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raythompsontn
join:2001-01-11
Oliver Springs, TN
| reply to NYR 56
said by NYR 56 :Also, you have been proved wrong, admit it, instead of rambling on with more technical posts to cover yourself. If you think people are going to go blind over a picture on DSLR then you better hope they don't venture into the rest of the internet either. No one has proven anything about being wrong. The photo is there. It clearly shows someone looking at the output of a fiber system. High speed, long distance fiber systems are driven by laser emitters, not LED emitters.
I provided links about the dangers of green lasers. If you think they are safe then continue to shine them in your eyes. It won't bother me.
As for going blind from a photo I think that was myth perpetuated by my parents when they found that Playboy magazine. |
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raythompsontn
join:2001-01-11
Oliver Springs, TN
| reply to TheBoz
said by TheBoz :
If it was a laser would like you say it was would it not be a point of light and not a big patch of light on face. Its probally LEDs thats being used. IMHO
Oh, I suspect that you are correct. I would also speculate that even with LED illumination the spot on the face would not be that large. The image was probably photoshopped to enhance the effect.
Regardless, I still feel the image promotes a very unsafe practice. One should never look at the output of any fiber system, period. Even knowing the emitter source is no guarantee. You only have two eyes and they cannot be replaced. |
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hopeflicker
Capitalism breeds greed
Premium
join:2003-04-03
Long Beach, CA
| reply to raythompsontn
said by raythompsontn :Well, in this case you would be markedly wrong buttermilk breath. relax, it's just a hunch
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People pray to God because they're told to. |
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raythompsontn
join:2001-01-11
Oliver Springs, TN
| said by hopeflicker :relax, it's just a hunch I guess my amusement did not convey well in the message. I was, shall we say, "blinded by the light." |
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