Multimode fiber

Multimode fiber allow different patterns of light into a single optical fiber transport, because multimode fiber of core diameter larger, it can be use relatively cheap coupler and connecting device, multimode fiber diameter of fiber core for 50 mu m to 100 muon m.

classification

There are basically two multimode fiber, one kind is gradient type (graded) another kind is Laplace domain model (stepped), for gradient type (graded) fiber speaking, the refractive index of refraction index (core) on the periphery of the smallest core and gradually increased to center, thus reducing the signal, and the modal dispersion of Laplace domain model (index) cable stepped for refractive index is basically average changeless, and only in the packet layer (cladding) on the surface will suddenly drops. Laplace domain model (stepped) fiber is generally gradient type (graded) the bandwidth of the fiber to be low. In the network applications, the most popular multimode fiber for 625,000/125,62.5/125 means fiber core diameter for 625,000 muon m packet layer (cladding) diameter for 125 muon m, other relatively common for 50/125 and 100/140.

contrast

Relative to the twisted-pair cable, multimode fiber can support long distances, in 10mbps and 100mbps Ethernet, multimode fiber longest can support 2,000 meters, while in the transmission distance 1GpS gigabit nets, multimode fiber highest can support the transmission distance 5.5 meters.

The industry is generally considered as the transmission distance over 295 feet, electromagnetic interference is very serious, or bandwidth required more than 350MHz, it should adopt multimode fiber instead of twisted-pair cable as carrier.

Multimode fiber product selection guidelines

Multimode fiber of nominal diameter specifications for HPVV 625,000 muon m / 125 muon m. or 50 mu m / 125 muon m.. Specifications (some) have 2, 4, 6, 8, 12 and 16, 20, 24, and 36, 48, 60, 72, 84, 96 core, etc. Cable outer security layer material with regular, Ordinary flame retardancy, For low smoke, non-halogen type, For low smoke, non-halogen, flame retardant.