Patching OM1 fiber to OM3 fiber
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Patching OM1 fiber to OM3 fiberExpand / Collapse
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Posted Friday, May 11, 2012 3:14 PM
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I have existing OM1 fiber installation.  I have added OM3 fiber to a new wiring closet.  For a 1Gig connection can I patch the OM1 to the OM3?
Post #7372
Posted Friday, May 11, 2012 6:34 PM
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It will not work very well.

OM1 is 62.5 vs. 50 for the OM3.

So you have a big pipe going to a small pipe and vice versa. It also doesn't account for if the cores are not aligned properly, which could cause even more problems.



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Post #7373
Posted Monday, May 14, 2012 9:47 AM


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turnerg (5/11/2012)
I haveexisting OM1 fiber installation. I have added OM3 fiber to a new wiring closet. For a 1Gig connection can I patch the OM1 to the OM3?

This answer will not be theory, but practical application. 

General answer (if selection of material is correct) - Yes it will work!

Questions
- Will this 1 Gb pipe be maxed out?
- What applications will be used (data, video, etc)
- How long is the structured cabling, existing and new OM3?
- What type of connectors are used in existing and new OM3?
- Which jumpers will be used (length, connectors, type)
-Kevin J


 

A picture is worth a thousand words. 

Post #7375
Posted Wednesday, May 16, 2012 10:43 AM
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I read somewhere that going from 62.5 to 50 micron will result in a loss of between 3.5 and 5 dB at the mated connectors or splice. And have actually witnessed this in the real world at sites that used 50 micron patch cords on a 62.5 micron cable plant.

62.5/125 to 50/125 = 3.5 to 5 dB loss

50/125 to 62.5/125 = <.5 dB loss

Though the loss in the circuit may not affect the transmission speed (depending on your equipment). You should only expect 1 gig rates at distances no greater than what the OM1 fiber supports.
Post #7379
Posted Wednesday, September 26, 2012 4:22 PM
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Difficulty is in prediction.  And, it depends what's used to measure.  Specifically, at one time light sources for cable loss were intended to overfill the fiber, or nearly so.  In that case, "losses" could appear to approach theoretical values.  (10 log [Ratio of core radii squared X ratio of NAs squared]) 

But in some applications, like GbE transceivers with laser sources, and without mode conditioning patch cords, the loss may be nearly negligible due to the small, low-order mode volume excited.   It can be tricky to know the difference, and cobbled patch cords can further confuse matters.  If there's even a chance of using LED transceivers on the link, best forget it.

cheers,
fabrizio_the_fibreguy

Post #7725
Posted Tuesday, October 09, 2012 3:39 PM


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Use a MM/MM optoelectronic media converter between the different core diameter fibers. Transition PN#SFMFF1313-220 supports 1000Base-SX.

http://www.transition.com/TransitionNetworks/Uploads/Downloads/SFMFF1xxx-22x.pdf

Hans Broesicke, RCDD

Post #7744
Posted Friday, February 08, 2013 3:45 AM
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You can see OM3 patch cords in the link below:
http://www.telkolink.com/tr/urun/OM3-PC.html


OM3 Multi-Mode Fiber Optik Bağlantı Kablosu , 50/125µm micron 10Gbps hızındaki fiber optik devrelerde kullanılır.
Post #8027
Posted Friday, February 08, 2013 11:23 AM


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Here is a good application note from Corning on the subject.

  Post Attachments 
an4256.pdf (77 views, 107.75 KB)
Post #8028
Posted Monday, February 11, 2013 10:40 AM
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and just for FYI OM3/4 to OM2.... 200 meters.... lesson learnt the  hard way....
Post #8029
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