Diameter-mismatch loss is a type of power loss in optical fiber cables that occurs when two fibers of different diameters are connected. In this case, the transmitting fiber has a larger diameter than the receiving fiber. The mismatch in diameters causes the light from the transmitting fiber to spread out over a greater area than the receiving fiber, resulting in a decrease in power on the receiving end.
The most common cause of diameter-mismatch loss is when two different cables are connected together, such as when a single-mode fiber cable is connected to a multi-mode fiber cable. This mismatch can also occur when two cables of the same type are connected, but one has a larger core or cladding than the other.
Diameter-mismatch loss is most likely to occur at the junction between two fibers, such as when they are spliced together or when a connector is used to link the two fibers. In this case, the mismatch in diameters will cause a decrease in the power at the junction. The greater the difference in diameters, the greater the power loss.
Fortunately, there are ways to minimize the effects of diameter-mismatch loss. The most effective method is to use connectors that are designed to match the diameters of both fibers, as well as splicing techniques that account for any difference in diameters. Additionally, it is important to use cables and connectors of the same type and size whenever possible.
In conclusion, diameter-mismatch loss is a type of power loss that occurs when two fibers of different diameters are connected.