Fiber Optic Splicing


I am working on a project to connect some branch offices to our main office via a fiber optic cable.  We are using a single-mode (OS2) cable with 24 fiber strands.  I would like to know if we can T-splice the fiber optic cable.  The cable would come from the main site, mid way I would like to have it T-spliced so one cable in the splice can to one branch site and the second cable in the T-splice can go to the other branch site.  Is this possible to accomplish on a utility pole using a closure?
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Dave BaldwinFixer of ProblemsCommented:
You can't T-splice a CAT5 cable in a network and have it work so I don't see how T-splicing a fibre would work any better.  ??
Daniel HelgenbergerCommented:
Splicing would make no sense at all, since it are serial point to point connections.

But you can just connect it to a switch of course. This should do it.

And, there are several very interesting technologies to multiplex different protocols over one fiber connection and demultiplex them at the end point.
For instance, see here:
Simple answer - no you cannot t-splice a fibre.

As others have said , you can cut and terminate both ends , then put in some active kit to allow you then connect in a third fibre too.

My suggestion would be to run 2 new fibres , rather than splitting the existing. One from each end of both the existing sites to the new location forming a triangle (one link being one cable with multiple cores). This way you also get resilience and the ability to patch from either end or straight through should there be a failure on one leg.
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ZorniacAuthor Commented:
Thanks for everyone's comments.  Ideally it would be nice to run multiple cables and then gain connectivity through switches, and at the same time build in resiliency.  Unfortunately, these cables are miles long, and are run aerial with limited space on the utility poles, and even more limited space in the duct that enters the building.

Let's call the main site A and the two branch offices B & C.  The splice point would be ABC.  I want to run a 24 strand piece of fiber from A to point ABC.  From site B I want to run a 12 strand piece of fiber to point ABC.  From site C I want to run a 12 strand piece of fiber to point ABC.  

Once all cables are at point ABC, I would like to designate 12 strands from cable A to site B, and designate the remaining 12 strands of cable A to site C.  

I was thinking how Verizon is able to have a fiber closure on the utility pole, and when a customer orders service they string the cable from the closure to the customer site.
You can do that , but you may need a 'service box' at the base of the pole (one of those fancy green vandal proof street cabs) , then a fibre patch panel or two with in the box. This will allow you to mix and match as you like , or pre-patch from the start yet still have the ability to change in the future.
You would of course need to be aware of loss at the patch link (get the fibres measured for loss properly ) , and choose a suitable connector (LC - but then limited to pairs , or ST probably). ST's are often used here.
Equally if they are fixed and would never need changing , they can be permanently spliced together as you suggested. A<->B x 12 joined at ABC and A<->C x 12 joined at ABC. There may still need to be a cab of some sort , but smaller. Again make sure you have the loss measurements end to end after splicing.

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ZorniacAuthor Commented:
Thanks Kzin_xxxx

Your are pretty much right on the money.  I contacted a vendor and have the splice scheduled.  He is using a fusion splicer with a .01%dB loss.  Vendor is doing the splice in a bucket, and protecting with an aerial closure.  WooHoo!!

thanks for your input
No problem - happy to help.

With regard to the loss , just make sure you have a measurement for each single fibre anyway , even though the claimed loss of a join may be 0.01dB - sometimes you get a duffer , and asking for measurements lets them know they will have to get them something like.

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