What are the two most common multimode wavelengths?

The two most common multimode wavelengths are indeed 850 nm and 1300 nm. Multimode fiber optic cables are particularly designed to transmit multiple light modes simultaneously, which occurs at shorter distances.

At 850 nm, light sources such as light-emitting diodes (LEDs) are commonly used, making it suitable for short-distance applications that require high bandwidth, such as within buildings. On the other hand, 1300 nm utilizes lasers or vertical-cavity surface-emitting lasers (VCSELs), which provide better performance at slightly longer distances due to lower modal dispersion.

These wavelengths align well with the performance characteristics of multimode fiber, such as the effective transmission of data over moderate distances while maintaining signal integrity. Understanding these wavelengths is critical for any fiber optic installer, as they directly relate to the types of equipment used and the applications for which the fiber is suited.