Fiber Optics
- Thread starter tshea
- Start date
- Status
- Location
- Illinois
- Occupation
- retired electrician
Re: Fiber Optics
The data sheet for the fiber that you are going to use will specify the dB loss. You will also have to look at the data sheets for the splices and connectors to get their dB loss.
Don
The data sheet for the fiber that you are going to use will specify the dB loss. You will also have to look at the data sheets for the splices and connectors to get their dB loss.
Don
Re: Fiber Optics
Attenuation on fiber is expressed as db/km and ranges from .5/km to 1000/km depending on the application at hand. The detectors have a optimum range, or a window if you will, that the light recieved must be in for best performance. A typical range would be say something like -17 dbm to -29 dbm. Anything hotter than -17 would burn the detector up, and anything below -29 would not be detected.
Now for the other end, the transmitter will transmit, depending on the appication anywhere from +6 dbm to -10 dbm. You have to have some attenuation to occur or you will burn up the detector. How much depends on the distance, bends, turns, cable type, splice budget, and connectors.
No matter what you calculate, it will be wrong. So any good design depends on getting the signal to its destination hot, make measurements, and add attenuators to get the signal in the window.
Here are some links.
http://www.arcelect.com/fibercable.htm
http://www.commsdesign.com/design_corner/showArticle.jhtml?articleID=16501782
You can perform your own seach using the term "fiber optic attenuation"
Attenuation on fiber is expressed as db/km and ranges from .5/km to 1000/km depending on the application at hand. The detectors have a optimum range, or a window if you will, that the light recieved must be in for best performance. A typical range would be say something like -17 dbm to -29 dbm. Anything hotter than -17 would burn the detector up, and anything below -29 would not be detected.
Now for the other end, the transmitter will transmit, depending on the appication anywhere from +6 dbm to -10 dbm. You have to have some attenuation to occur or you will burn up the detector. How much depends on the distance, bends, turns, cable type, splice budget, and connectors.
No matter what you calculate, it will be wrong. So any good design depends on getting the signal to its destination hot, make measurements, and add attenuators to get the signal in the window.
Here are some links.
http://www.arcelect.com/fibercable.htm
http://www.commsdesign.com/design_corner/showArticle.jhtml?articleID=16501782
You can perform your own seach using the term "fiber optic attenuation"
ramsy
NoFixNoPay Electric
- Location
- LA basin, CA
- Occupation
- Service Electrician 2020 NEC
Re: Fiber Optics
For a rough-in rundown, running fiber between levels, bending it too tight, or 30lbs of pulling can seperate it, unless Riser rated or in supported socks.
Hepa vacs suck cuttings, drill filings, & dust in data centers. Most shops paid fiber tech's to terminate and test, some kept a fiber guy, rented their own fusion splicers, test equip., etc..
Most problems occured with security clearances and doors locking behind us. Two-way radios and door stops were indispensible.
For a rough-in rundown, running fiber between levels, bending it too tight, or 30lbs of pulling can seperate it, unless Riser rated or in supported socks.
Hepa vacs suck cuttings, drill filings, & dust in data centers. Most shops paid fiber tech's to terminate and test, some kept a fiber guy, rented their own fusion splicers, test equip., etc..
Most problems occured with security clearances and doors locking behind us. Two-way radios and door stops were indispensible.
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