What is the Meaning of UPC and APC?
Whenever a connector is installed on the end of fiber, loss is incurred. Some of this light loss is reflected directly back down the fiber towards the light source that generated it. These back reflections will damage the laser light sources and also disrupt the transmitted signal. To reduce back reflections, we can polish connector ferrules to different finishes.
There are four types of connector ferrule polishing style in all. UPC and APC are two types of them. UPC stands for Ultra Physical Contact connector. The current trend is using it in deadlines to allow operators to perform networks tests for example by using an OTDR. APC stands for Angled Physical Contact connector. APC is the most used polishing type nowadays.
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Differences between UPC and APC Connector
APC is more suited for high bandwidth applications and long distance links, such as FTTx, passive optical network (PON) and wavelength division multiplex (WDM), they are more sensitive to return loss. If the return loss requirement is not high, UPC is a better choice.
The main difference between UPC connector and APC connector is the fiber endface. APC connectors have the endface that is polished at an eight degree angle, while UPC connectors are polished with no angle, but UPC connectors have a slight curvature.
UPC or APC – Which One to Choose?
Many people may ask which one is better, UPC or APC connector? The answer is that it depends on your need, because they have expertise in different places.