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fiber optic cable life expectancy
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Source：Internet Author：Unknow Pubdate：2008-04-14
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cvirgil (Electrical)
5 Mar 06 8:05
Anyone know the typical life expectancy of fiber optic cable installed undergroiund in conduit? What are the factors affecting life expectancy?
JLSeagull (Electrical)
5 Mar 06 13:58
Glass lasts a lifetime. I would expect a real long life.
ScottyUK (Electrical)
5 Mar 06 14:36
Rats in pull pits sometimes chew fibre. Power cables tend to kill the rats, but on fibre they just keep munching. Steel tape armour is fairly resistant, but once the rodents attack the outer sheath the exposed steel can corrode. The best solution is keeping the ducts sealed and the pull pit lids secure, then the little bas___ds can't get in. ----------------------------------
I don't suffer from insanity. I enjoy it...
字串5
zappedagain (Electrical)
6 Mar 06 21:59
The typical failure we see on single mode fiber is from too much optical power. If you 'smoke' a fiber with too much power (milliwatts) you can burn a small hole in the end of the fiber (similar to a divot in golf). This can have some nasty attenuation/reflection/refraction effects on your signal even after the power is turned back down.
canyoncruz (Mechanical)
22 Apr 06 18:40
The life tome if fiber cable, barring rats of backhoes, is depenand on the bend radius and any dynamic movement. Other issuses are thermal shock. This has all be calculated and enforce by TELCORDIA. All fiber race ways are made to maintain a minimal bend radius.
Resently, these radii sepcs have change though. Newer sysetems running at longer wavelengyths are supseptable to polarization anomalies which are produced in the fiber during a bend. In short, the bending stess producess non symetrical index of refraction changes. 字串4
As long as the above criteria are met, the fiber will last as long as a pice of class, or glass bottle baried in the ground
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