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I saw that computer Network Interface Cards (NICs) that use fiber ports (SFP) instead of RJ-45 ports and I wonder if there would be any significant advantage in connecting the computers directly through optic fibers instead of RJ-45 (UTP)

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    Don't forget disadvantages: larger bending radius, unsteadiness to fracture, larger cabling and port cost. – user36844 Sep 6 '17 at 6:23
  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you can provide and accept your own answer. – Ron Maupin Feb 19 '18 at 18:44
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There's several advantages to Fiber-to-the-desk

  • length: copper cabling is limited to 90 meters of horizontal cabling (leaving 10 meters for patching). Fiber doesn't have this limitation. In some building this can make a difference

  • cabled once for all: upgrading from 1Gbs to 10/50/100Gbs or a future Tbs doesn't require to recable the building, the fiber will do the job. Considering the cost of cabling, this can be a huge advantage.

  • security: it's more difficult to spy (tape) on a fiber cable than on copper. By listening to the radio frequency, one can remotely listen the traffic that goes over a copper cable. I did a fiber-to-the-desk project in a diplomatic office and this was the reason to go fiber.

  • fiber is immune to radio interference.

  • Your second point is really only true if you run single mode fiber. – Peter Green Sep 15 '17 at 17:19
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The main reason for fiber is reach: a fiber port with the appropriate optics can connect over many dozen kilometers - transceivers for 70 km or more are not uncommon. Currently, fiber Ethernet exists for up to 100 Gbit/s, with 200 and 400 Gbit/s being developed.

Other reasons may be: electromagnetic immunity, thinner cable, slightly lower latency, harder to tap

Copper is limited in reach (usually max. 100 m) and speed; the fastest copper Ethernet PHY, 40GBASE-T runs over just 30 m with special Cat.8 cable).

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There are some main advantages of using fiber optic cables instead of copper: Fiber optic transmission is faster; Fiber optic transmission results in less attenuation; Fiber optic cables are impervious to electromagnetic interference (EMI); Fiber optic cables do not break as easily. http://www.thefoa.org/tech/fo-or-cu.htm I hope this link may be helpful to you~

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