In optical networking, there has been several evolutions of optical fibre technology, both to improve existing technology and bandwidth, and in the implementation of different technologies to suit various applications. This has led to a mix of optical fibre types being implemented in networks around the world. This is particularly apparent in differences between short distance multimode fibre links, and the long distance singlemode fibre links.
Often it is required to convert between singlemode and multimode fibre when upgrading an existing installation while maintaining some legacy links. Fibre Optic Systems offers mode converters specifically for this task.