Use of optical cable for short distances?

Question

Computer networks

The task is to lay "optics" between two offices located at a distance of 1.7 km. What is the best cable to use: singlemode or multimode?

Answer 1

It is better to lay a multi-fiber one and with a separate understudy you can use 50% less than the base one - at such a distance you are unlikely to come across a direct and completely prepared collector from a line ready for laying to the subscriber - there will be rises and corners of buildings, air wells (probably ) and the last finish line and probably with risers packed to capacity. Bends inversion with a visit to neighboring foreign cables, another obstacle, can break half of the strands of even an armored cable. Good luck, and take a pro with expensive experience to the team, because such a "cable" is an expensive pleasure.
Take an armored one from 16 cores with a cable - yes, when you enter the server room, the cable must be cut off 10 meters from the entrance in order to avoid short circuits, lightning and other emergency situations.

Answer 2

Forget multimode! And if you throw optics, throw a couple of cables with 16 cores at once, they won’t be superfluous.

Answer 3

Modules for multi-mode usually go up to 300 meters, up to 10 km there is already single-mode.

Answer 4

100BASE-FX works on different fibers for receiving and transmitting at distances up to 2 km, although I haven’t seen such media converters for a long time and most likely will be old as mammoth shit with the corresponding degradation of radiating and receiving elements - you shouldn’t get involved.
1000BASE-LX on multimode works at distances up to 550 m, not your option in terms of length, 1000BASE-LX remains on single mode.
If you need a source with all options - see the segment length for single mode and multimode in the IEEE 802.3u, 802.3z, 802.3ae and 802.3aq standards, or the consolidated IEEE 802.3-2015
PS A cable for 4 fibers in bays of several kilometers is cheaper than a twisted pair cable per meter. A professional team for pulling the cable and welding is desirable, we have already written about this. There are self-supporting fiber optic cables for aerial laying - you can throw them over poles or between buildings.
PPS You can look at Ubiquiti radio bridges, if your conditions allow you to use a radio relay - that's for sure the price and amount of hemorrhoids during installation will be noticeably less, you can do it yourself.