APC UPC Fiber Adapter

PC (Physical Contact), physical contact. PC is ground and polished on the microsphere surface, and the surface of the insert is ground to a slight spherical surface.

UPC (Ultra Physical Contact), a super physical end face. The end face of the UPC connector is not completely flat, with a slight curvature.

APC (Angled Physical Contact), with oblique physical contact, the fiber end face is usually ground to an 8° inclined plane.

Insertion Loss: The typical insertion loss of PC, UPC, and APC connectors should be less than 0.3dB (larger value), and the typical value is generally less than 0.2dB. UPC/PC connectors are usually easier to achieve low insertion loss.

Return Loss: The return loss of APC connectors is usually better than that of UPC connectors, with a PC return loss of -45dB. The UPC return loss is generally within -50dB (or even higher). The return loss of APC industry standard is -60dB.

What is the difference between SC APC UPC Fiber Adapter?

UPC/APC/PC is a grinding method for fiber end faces.

PC (Physical Contact), physical contact. PC is a micro ball surface grinding and polishing process, with the insert surface ground into a slightly spherical surface. The fiber core is located at the highest point of bending, which can effectively reduce the air gap between the fiber components and achieve physical contact between the two fiber end faces.

UPC (Ultra Physical Contact), a super physical end face. The end face of the UPC connector is not completely flat, with a slight curvature to achieve more precise docking. UPC optimizes the end face polishing and surface finish on the basis of PC, making the end face appear more dome like.

APC (Angled Physical Contact) refers to the physical contact of an inclined plane, and the fiber end face is usually ground to an 8 ° inclined plane. The 8° angle ramp makes the fiber end face tighter and reflects light through its ramp angle to the cladding instead of directly returning to the light source, providing better connection performance. Absorbing reflected light by the cladding reduces back reflection in the fiber core and provides excellent return loss performance.

Insertion Loss: The typical insertion loss of PC, UPC, and APC connectors should be less than 0.3dB (larger value), and the typical value is generally less than 0.2dB. Compared to APC connectors, UPC/PC connectors are usually easier to achieve low insertion loss due to smaller air gaps. Insertion loss may also be caused by dust particles between the connector end faces.

Return Loss: A parameter that represents the reflection performance of a signal, often represented by a negative dB value. The higher the parameter, the better. The end face of APC connectors is beveled and polished, so the return loss of APC connectors is usually better than that of UPC connectors. In general, the return loss of PC is -45dB. The UPC return loss is generally within -50dB (or even higher). The APC industry standard has a return loss of -60dB.

Application scenario: PC is the most common grinding method for fiber optic connectors on fiber optic jumpers and is widely used in telecom operator equipment; UPC low sensitivity fiber optic signal applications are typically used on Ethernet network devices (such as ODF fiber optic distribution frames, media converters, and fiber optic switches), as well as digital, cable TV, and telephone systems; APC is generally used for high wavelength range optical RF applications such as CATV, high-precision fiber optic signal applications, and also for optical passive applications such as PON network structures or passive optical local area networks.

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