Apc Fiber Connector Angle

Because of the angle the reflected light does not stay in the fiber core but instead leaks out into the cladding.

Apc fiber connector angle.

With upc connectors any reflected light is reflected straight back towards the light source. Upc connectors are polished with no angle but apc connectors feature a fiber end face that is polished at an 8 degree angle. Apc connector is a type of fiber connector that minimizes backreflection due to a 5 to 15 angle polish applied to end faces. Another more obvious difference is color.

The apc connector is altogether much more crafty. Upc connectors are blue while apc adapters are green. Apc connectors are polished at an 8 degree angle. These fc apc connectors have an 8 pre angled ceramic ferrule which when properly polished results in a typical return loss of 60 db.

Angled physical contact connectors apc optifiber the most common types of fiber connectors are pc and upc ultra physical contact. Any reflection light bounces back from the interface at 16º to the axis which is greater than can be constrained by the fiber core cladding interface so is thus lost. Instead of a contact end face which is perpendicular to the fiber axis the end face is manufactured so that it is at an angle of 8º to the axis. Apc connectors feature a fiber endface that is polished at an eight degree angle.

Upc connectors are polished with no angle. Upc connectors are polished with no angle but are slightly curved for better core alignment. They have a slight curvature for better core alignment. The apc stands for angled physical contact because these connectors allow the surfaces of two connected fibers to be in direct contact with each other and because the fiber end is polished at an angle to prevent reflected light from traveling back up the fiber.

Like illustrated in the following picture. This causes some differences in return loss. Connectors with apc finishes are made by polishing the fiber at either an 8 or 9 degree angle with a radius of curvature between 5 and 12 mm see figure 1. Upc connectors are not exactly flat however.

This in turn reduces the amount of light reflected back. By angle polishing the end of the fiber one ensures that reflections at the fiber air interface are not captured by the fiber core. Angled polished physical contact apc also called as apc fiber connector is best for high bandwidth applications and long haul links since it offers the lowest return loss rl characteristics of connectors currently available. With upc the fiber ends are more rounded than the pc finish giving greater contact between the glass surfaces.

Upc connectors are blue while apc connectors are green.