Graded Index Multi Mode Fiber

High temperature coatings for 150 c and 300 c.

Graded index multi mode fiber.

Graded index fiber is of only one type that is multi mode fiber. Index profiles is in the shape of a parabolic curve for α 2. Multi mode optical fiber can be built with either graded index or step index. 50μm and 62 5μm variants.

The diameter of core in graded index multimode fiber is somewhat between 50 to 100 micrometer. The advantage of the multi mode graded index compared to the multi mode step index is the considerable decrease in modal dispersion. Graded index multimode optical fibers optimized for signal transmission at 850 and 1300 nm are available with 50 125 62 5 125 and 100 140 µm core cladding diameters. Multi mode fibers are described by their core and cladding diameters.

Because of the larger core size compared to single mode fiber these fibers provide a higher transmission capacity and are used for short range communication networks and high speed transmission applications. The large diameter of the core allows multiple rays to propagate through the fiber. The transition between the core and cladding can be sharp which is called a step index profile or a gradual transition which is called a graded index profile. Graded index fiber is a type of fiber where the refractive index of the core is uniform at the center core and then it decreases towards core cladding interface.

Thus 62 5 125 μm multi mode fiber has a core size of 62 5 micrometres μm and a cladding diameter of 125 μm. Thorlabs graded index grin multimode fiber provides lower modal dispersion and less bend loss than traditional multimode step index fiber with a broad operating wavelength range from 800 1600 nm see the graphs tab for attenuation plots over this range. This type of fiber is normalized by the international telecommunications union itu t at recommendation g 651 1. Graded index multimode fiber.

The light wave that travels inside the fiber changes its behaviour with time while travelling inside it.