APC (Angled Physical Contact) and UPC (Ultra Physical Contact) are two common types of fiber optic connectors, which have some differences in connection methods and performance.
Connection Method:
The fiber end face of an APC connector is angled, usually at an 8 degree angle. This tilted angle reduces reflections and returns, providing lower insertion loss and higher return loss. Due to the angled end face, APC connectors require precise alignment when connecting.
UPC connectors have a flat fiber end face with no tilt angle. This connector provides lower insertion loss and moderate return loss and is easier to align compared to APC connectors.
Application Areas:
APC connectors are mainly used in applications requiring high return loss, such as single-mode fiber connections in optical communication systems, optical splitter connections, and optical measurement equipment.
UPC connectors are suitable for general fiber optic connections, including data communications, local area networks, and fiber to the home (FTTH).
Return Loss:
APC connectors offer higher return loss, typically above 60 dB, which means less of the optical signal is reflected back to the light source. They are important for applications where signal reflection needs to be minimized.
UPC connectors typically have a return loss of around 50 dB and are suitable for most general applications.
It is important to note that APC and UPC connectors are not compatible in terms of their physical interfaces, and they have different connection methods and tilt angles. When selecting a connector, it is necessary to determine which type of connector to use based on the requirements of the specific application and the compatibility of the equipment.
