A "mode" is a beam of light that enters the fiber at a certain angular speed.
1, single-mode fiber uses a solid-state laser (LD) as the light source, while multimode fiber uses a light-emitting diode (LED) as the light source.
2, multimode fiber works at wavelengths of 85onm and 1310nm, single-mode fiber works at wavelengths of 1310nm and 1550nm. 3, the maximum bandwidth of multimode fiber optic communication is 1Gbit/s, single-mode fiber optic communication can usually transmit more than 100Gbit/s. 4, multimode fiber transmission distance is small, 1000M bit/s bandwidth transmission, reliable distance of 255 meters (m). 100Mbit/s bandwidth transmission, a reliable distance of 2 kilometers (km); single-mode fiber is mostly used for long-distance transmission, sometimes up to 150 to 200 km.
Multimode fiber allows multiple beams of light to propagate simultaneously in the fiber, thus forming a mode dispersion (because each "mode" of light enters the fiber at a different angle they arrive at another - endpoint at a different time, a feature known as mode dispersion). Mode dispersion limits the bandwidth and distance of multimode fibers, so multimode fibers have thick cores, low transmission speeds, short distances, and poor overall transmission performance, and are generally used in buildings or geographically adjacent environments. Single-mode fiber can only allow a - beam of light to propagate, so single-mode fiber does not have mode dispersion characteristics, therefore, single-mode fiber has a correspondingly thin core, wide transmission band, high capacity, long transmission distance, but because it requires a laser source, the cost is higher.
How to identify singlemode or multimode?
In the fiber optic manufacturing industry, multimode is mostly orange and singlemode is yellow.
