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Angle-polished connections are distinguished visibly by the use of a green strain relief boot, or a green connector body. The parts are typically identified by adding "/APC" (angled physical contact) to the name. For example, an angled FC connector may be designated FC/APC, or merely FCA.
The APC-7 connector (also referred to as a 7 mm connector) is a precision coaxial connector used on laboratory microwave test equipment for frequencies up to 18 GHz. APC-7 connectors are advantageous because they have a low reflection coefficient , make repeatable coaxial connections, and are genderless . [ 1 ]
An APC connector's inserted core cover is oblique (about 30°, ±5°). [3] To reduce the back reflection of a connector, UPC polish is used. Industry standard is a maximum of −40 dB for PC back reflection measurement and −50 dB for UPC back reflection measurement. If even less back reflection is required, an APC might be necessary.
PM FC/PC connectors typically use FC/APC keying since the angular alignment tolerance is tighter. Some connector designs have the key as a separate, indexable component. This can allow for some reduction in insertion losses (depending on the concentricity accuracy of the ferrule) by allowing the ferrule to be rotated to a more fortuitous alignment.
The curved surface may be polished at an angle, to make an angled physical contact (APC) connection. Such connections have higher loss than PC connections but greatly reduced back reflection because light that reflects from the angled surface leaks out of the fiber core. APC fiber ends have low back reflection even when disconnected.
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APC was founded in 1981 by three MIT Lincoln Lab electronic power engineers. Originally, the engineers focused on solar power research and development. [2] When government funding for their research ended, APC shifted its focus to power protection by introducing its first UPS in 1984.
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