Multimode Fiber Specs

Multi mode fiber has a fairly large core diameter that enables multiple light modes to be propagated and limits the maximum length of a transmission link because of modal dispersion.

Multimode fiber specs.

Multi mode links can be used for data rates up to 100 gbit s. Om3 and om4 fibers will support upcoming 40 and 100 gb s speeds. Each type of them has different characteristics. Om1 62 5 µm fiber has reached its performance limit.

At present there are four commonly used om multimode fibers. Om1 om2 om3 and om4. Only om3 and om4 multimode fibers are included in the ieee 802 3ba standard for next generation 40 and 100 gb s ethernet. Because of this the number of light reflections created as the light passes through the core increases creating the ability for more data to pass through at a given time.

Multimode fibers are described by their core and cladding diameters. Fiber specifications the usual fiber specifications are size core cladding diameter in microns attenuation coefficient db km at appropriate wavelengths and bandwidth mhz km for multimode fiber and chromatic and polarization mode dispersion for singlemode fiber. Multimode fiber optic cable has a large diametral core that allows multiple modes of light to propagate. Usually the diameter of the multimode fiber is either 50 125 µm or 62 5 125 µm.

850 nm laser optimized 50 125 μm. 850 nm laser optimized 50 125 μm. Two types of om cables with core diameters of 50 micron and 62 5 micron are specified. The large core gives om cables a higher light gathering capacity compare to os cables.

At present there are four kinds of multi mode fibers. The diameter of the multi mode fiber is either 50 125 µm or 62 5 125 µm. Om1 om2 om3 and om4. This multiplexing design allows om5 to dramatically reduce parallel fiber counts.

Om5 is the first approved as wbmmf wide band multimode fiber is designed to specifically handle high speed data center applications with using two fibers to transmit from 40gbs up to 100gbs and is powered by shortwave wavelength division multiplexing swdm. The main difference between om and os type cables is in core diameter with om multimode fibers has a much larger core size. Some types are single mode and some types are multimode. Channel attenuation db 4 0 4 0 4 0 4 0 supportable distance m ft 300 984 300 984 300.

Tia 492aaaa om1 tia 492aaab om2 tia 492aaac om3 tia 492aaad om4 nominal wavelength nm 850. In lab testing 50 µm fiber offers as much as ten times the bandwidth of 62 5 µm fiber.