PSA - don't look into fiber optics

spidey07

No Lifer
Aug 4, 2000
65,469
5
76
I've worked in communicaitons for quite a while. I ignored the warnings and what not and would look into a fiber optic cable to see the light to make sure I had the right cable. nah, those warnings don't mean anything...they're just like the warnings on the laser scanner at the grocery store.

Well I've had a spot on my eye for two years now, very small. Eye doctor examined my eyes for a full checkup. He said "you've got a very small scar tissue on your retina...that is causing the spot. you don't per chance work with fiber optics do you. Yep, burned a small spot on my retina.

I have since never looked into a fiber transmitter/cable again. Nor will I ever. So if you see somebody looking into the cable tell them to quit. And cap your transmitters. You only have one set of eyes.

-cliffs-
1) looked into fiber
2) burned spot/scar tissue on retina
 

imported_Pablo

Diamond Member
Jan 20, 2002
3,714
1
0
couldn't you have just pointed the fiber optic cable at your hand and seen the light?

Hindsight FTW!
 

Heisenberg

Lifer
Dec 21, 2001
10,621
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No kidding. It doesn't take that much direct power to cause damage. Even a 1mW laser directly in the eye will cause a spot. The lasers in our lab next door scare me, quite frankly.
 

notfred

Lifer
Feb 12, 2001
38,241
4
0
Couldn't you jsut shine it on your hand or the wall or something and then look and see if there was a light spot there, instead of looking directly into it?
 

MiniDoom

Diamond Member
Jan 5, 2004
5,305
0
71
I put a piece of paper in front of it and if a red dot shows up it works.
 

Toonces

Golden Member
Feb 5, 2000
1,690
0
76
you mean I can check to see if my gun is loaded by not looking directly down the barrel? :confused:
 

Baked

Lifer
Dec 28, 2004
36,052
17
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Originally posted by: notfred
Couldn't you jsut shine it on your hand or the wall or something and then look and see if there was a light spot there, instead of looking directly into it?

Simplicity escaped the OP. Maybe he's one of those LED freaks w/ LED fans all over his computer case.
 

spidey07

No Lifer
Aug 4, 2000
65,469
5
76
Originally posted by: notfred
Couldn't you jsut shine it on your hand or the wall or something and then look and see if there was a light spot there, instead of looking directly into it?

the fiber I deal with is incredibly small (9 microns) so you can't really shine it onto something. It's just about impossible to see the light and instead you use test equipment.
 

bleuless

Senior member
Jul 25, 2001
437
0
76
Originally posted by: Pablo
couldn't you have just pointed the fiber optic cable at your partner's eye and seen the reaction?

fixed :)

when i was a kid i used to look into the sun, and now a days i see bunch of "scars" floating around.

 

csiro

Golden Member
May 31, 2001
1,261
0
0
cool. Is it possible to write out the letter z everywhere you look this way?
 

wfbberzerker

Lifer
Apr 12, 2001
10,423
0
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Originally posted by: bleuless
Originally posted by: Pablo
couldn't you have just pointed the fiber optic cable at your partner's eye and seen the reaction?

fixed :)

when i was a kid i used to look into the sun, and now a days i see bunch of "scars" floating around.

um, those aren't scars, and thats normal.
 

Glavinsolo

Platinum Member
Sep 2, 2004
2,946
0
0
Didnt they teach you to stick your hand at the end of the fiber to see if any light was projected on your hand?
 

bleuless

Senior member
Jul 25, 2001
437
0
76
Originally posted by: wfbberzerker
Originally posted by: bleuless
Originally posted by: Pablo
couldn't you have just pointed the fiber optic cable at your partner's eye and seen the reaction?

fixed :)

when i was a kid i used to look into the sun, and now a days i see bunch of "scars" floating around.

um, those aren't scars, and thats normal.

i could swear i read it some where (no pun intended) that is the result of looking into bright object....
 

Darthvoy

Golden Member
Aug 3, 2004
1,825
1
0
When I was kid a looked directly into on of those pen lasers. Now I have very high stigmatism on my right eye...so to conclude..yes those warning actually mean something
 

Lonyo

Lifer
Aug 10, 2002
21,938
6
81
Originally posted by: Glavinsolo
Didnt they teach you to stick your hand at the end of the fiber to see if any light was projected on your hand?

Didn't anyone teach you to read the thread before replying?
 

preslove

Lifer
Sep 10, 2003
16,754
64
91
Originally posted by: UNESC0
you mean I can check to see if my gun is loaded by not looking directly down the barrel? :confused:

Looking down the barrel is more fun, dude.
 

spidey07

No Lifer
Aug 4, 2000
65,469
5
76
Well the only other way besides test gear is to shine a birght light into the fiber. But even then you could be looking into a fiber that was lit with a laser on the other end. And that only works for distances under a few kilometers.

But I won't be taking any chances.

I just see people doing this sometimes and wanted to get the warning out. I shudder to think about the power levels of some of the long haul gear has.
 

TuxDave

Lifer
Oct 8, 2002
10,571
3
71
Ouch. I was always required to wear optical safety glasses when I worked in the fiber optics lab.
 
Jun 19, 2004
10,860
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as someone earlier said, hindsight is 20/20, but yours sure isn't!

Sorry dude. You could use the fiber to try and give yourself lasik surgery though!

again, sorry. Thanks for the warning, seriously.
 

TuxDave

Lifer
Oct 8, 2002
10,571
3
71
Originally posted by: spidey07
Originally posted by: notfred
Couldn't you jsut shine it on your hand or the wall or something and then look and see if there was a light spot there, instead of looking directly into it?

the fiber I deal with is incredibly small (9 microns) so you can't really shine it onto something. It's just about impossible to see the light and instead you use test equipment.

That and the fact that (at least for the ones that I worked on) work on frequencies outside of the visible spectrum (~900nm and ~1500nm for EDFAs) and they're REALLY high powered. So MAYBE shining it on your hand would work because your hand would start getting burned.