Which type of multimode optical fiber is recommended for backbone cabling?

Graded index optical fiber is recognized as the appropriate choice for backbone cabling due to its design that minimizes modal dispersion, allowing for better performance over longer distances compared to other types of multimode fibers. In a graded index fiber, the refractive index of the core decreases gradually from the center towards the cladding, which causes light rays to take a more direct path through the fiber, reducing the time it takes for the light signals to travel. This characteristic makes graded index fibers effective in handling higher bandwidths and longer runs typical in backbone installations.

Conversely, while singlemode optical fiber offers better performance over extended distances and lower attenuation, it is primarily suited for specific applications requiring high bandwidth over long spans and is typically not classified under multimode fibers. Zero dispersion optical fiber focuses on minimizing dispersion at a specific wavelength, but this is particularly relevant for singlemode fibers in long-distance telecommunications rather than multimode applications. Quartz fiber refers generally to fibers made from silica, which could encompass various types and is not specific to multimode applications or backbone cabling standards.