What is the difference between Singlemode and Multimode fiber?
There are many answers to this, but the primary difference is related to available bandwidth and distance. Singlemode fiber has a smaller core designed to allow only one mode of light to travel through it at once, which provides for longer distances and less signal attenuation. Multimode fiber has a larger core size that allows multiple modes of light propagation, allowing more data to pass through at a given time.