What's the best redundant option for a 150' fiber link between two network switches?

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Our client is building a new 100K square ft, two story facility. There is one server room on each floor and a fiber link will be installed to connect both server rooms. In case of the failure of the fibre link, we have to find a redundancy for this fibre link. Should we install a 2nd fiber link or just a CAT6 cable would be sufficient?
The switches we will be installing are all Ubiquiti UniFi switches in this building. And the switch on both end of the fibre link can be UBIQUITI US-16-XG

Thanks!!
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Principal Software Engineer
Commented:
Install a second fiber, but route it separately from the primary and never through the same locations until they both emerge at the terminus.  This prevents any accident (fire in a cable tray, Bubba the electrician, rats) from destroying both cables at once.

While pulling the fibers, pull four Cat6 cables along with each one as cold spares.  You never know.  Six years along it may turn out that this batch of fiber has a lifetime shorter than rated.   You'll have copper to fall back on rather than a second fiber which is also failing.
Y Yconsultant

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Commented:
Hi Dr. Klahn,
Thanks a lot for your input!
I checked with the cable installer, and was told that there is no alternate route for another fiber. There will be only one conduit between two server rooms and the fiber and copper cables will all be pulled in this conduit. So it does not make much sense to me to have 2nd fiber in this conduit, a CAT6 cable seems good enough. But you mentioned 4 CAT6 cables, is there a special reason behind this?
Thanks
Jack
Y Yconsultant

Author

Commented:
Thanks Dr.Klahn.
We will install a CAT6A or CAT7 along with the fiber link as a cold spare.

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