Ultra Physical Contact (UPC) and Angled Physical Contact (APC) and their differences

 Ultra Physical Contact (UPC) and Angled Physical Contact (APC) are two different types of fiber optic connectors that are used to connect optical fibers. Both types of connectors use a physical contact to join two fibers, but they differ in the way the fibers are aligned and the angle at which they meet. 

Ultra Physical Contact (UPC) is a type of fiber optic connector that is used to join optical fibers. It is designed to provide a high degree of physical contact between the fiber end faces, which helps to reduce insertion loss and improve the quality of the signal. The end face of a UPC connector is flat and perpendicular to the fiber axis, which means it meets the end face of another connector at a 90-degree angle. This results in a physical contact that is very close to ideal, with minimal gaps between the fibers. UPC connectors are commonly used in applications where low insertion loss is important, such as data centers and local area networks (LANs).

Angled Physical Contact (APC) is another type of fiber optic connector that is used to join optical fibers. Unlike the flat end face of UPC connectors, APC connectors have an end face that is angled at an 8-degree angle. This angled end face helps to reduce reflection, which can cause signal loss and interference. The angled end face also helps to achieve a higher degree of physical contact between the fibers, resulting in lower insertion loss and higher return loss than UPC connectors. APC connectors are often used in applications where low insertion loss and high return loss are critical, such as in cable television (CATV) and passive optical networks (PONs). However, the angled end face of APC connectors can also make them more difficult to terminate and more expensive than UPC connectors. 

 

Here are the key differences between UPC and APC:

1. Angles: The most significant difference between UPC and APC is the angle at which the fiber end faces meet. In UPC connectors, the end faces are flat and perpendicular to the fiber axis, which means they meet at a 90-degree angle. In APC connectors, the end faces are angled at an 8-degree angle. This angled end face helps to reduce reflection, which can cause signal loss and interference.
   
2. Signal loss: Due to the difference in angle, UPC connectors typically have higher insertion loss than APC connectors. Insertion loss is the amount of light that is lost when it passes through a connector. UPC connectors typically have an insertion loss of less than 0.3 dB, while APC connectors can achieve an insertion loss of less than 0.2 dB.
3. Reflection: The angled end face of APC connectors helps to reduce reflection, which can cause signal loss and interference. Reflection occurs when light waves bounce back from a surface, such as the end face of a connector. In APC connectors, the angled end face reduces the amount of light that is reflected, which helps to improve the quality of the signal.
4. Applications: UPC connectors are commonly used in applications where low insertion loss is important, such as data centers and local area networks (LANs). APC connectors are often used in applications where low insertion loss and high return loss are critical, such as in cable television (CATV) and passive optical networks (PONs).
5. Color:APC connectors are green,UPC connectors are blue

In summary, UPC and APC connectors are both used to connect optical fibers, but they differ in the way the fibers are aligned and the angle at which they meet. UPC connectors have a flat end face that meets at a 90-degree angle, while APC connectors have an angled end face that meets at an 8-degree angle. The angled end face of APC connectors helps to reduce reflection and achieve lower insertion loss than UPC connectors. The choice between UPC and APC connectors depends on the specific application and the requirements for insertion loss and return loss.