The choice of which fibre to use depends on the application and the distance required for the transmission. There are several different sizes and shapes, different strand counts and different widths. It is critical that we understand what you want connected and what it is intended to be used for so that we can recommend which fibre is best suited for your purposes.
The basic difference is single or multi mode. Multi mode is the less expensive. It is designed to work with LEDs, which are fairly inexpensive. Multi Mode provides you with high bandwitdths at high speeds for short distances (900 meters). Typically it comes in six strands, of which four are terminated for a typical connection (2 for redundancy). A variety of widths may be use: 50, and 62.5 are the most common.
Single mode is better suited for long distances and has a higher throughput. However, Single mode only works with expensive laser transmitters.Typical width are 8.3 to 10 microns.This used for long distances – 50 times the distance of multi mode.