![]() ![]() Though it has a relatively lower back reflection in comparison with the PC connector, it is not robust enough. It is an improvement of the PC fiber connector with a better surface finish after an extended polishing and the return loss is better than PC structure, nearly -50dB or higher. UPC is the acronym for Ultra Physical Contact. Up to now, this polish style has been outdated and the evolution - UPC polish style has come into being. In PC fiber connector design, there is a slightly cylindrical cone head with the aiming to eliminate the air gap, so that the typical return loss in single mode applications is about -40dB, higher than the return loss of the original flat polish style (-14 dB or roughly 4%). PC fiber connector was generated to overcome the air gap between two surfaces from small imperfections in the original flat fiber connector. It is the most common polish type that is found on OM1 and OM2 multimode fiber. PC fiber connector refers to the connector that is polished in the physical contact style. There are four connector polish types, three of which will be highlighted below. To increase the efficiency of fiber, engineers began to upgrade the surface of the critical point of attachment, and that’s how ferrule polish technologies are introduced. When connectors are installed on the end of a fiber, light is reflected back up the fiber towards the source, disrupting the signal. The ferrule is the housing for the exposed end of a fiber, designed to be connected to another fiber, or into a transmitter or receiver. ![]() To put it simply, PC, UPC, and APC refer to the polish styles of the ferrules inside the fiber optic connectors, just as the following figure shows. Introduction to Different Connector Types ![]()
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