Tip of the Week:
Fiber connectors are available with three different types of end face polish, PC (physical contact flat), SPC (super physical contact), UPC (ultra physical contact), APC (angle physical contact). These different polish types identify the amount of curvature that is placed onto the connector end face during the manufacturing process. The curvature primarily determines the amount of optical power that is reflected back at the connection when two connectors are mated. Also, the less reflected power that occurs, the lower the connector insertion loss (except for APC).
In general, typical reflectance specs are as follows (however individual manufactures may vary from these values):
PCÂ Â Â < -30 dB
SPC < -40 dB
UPC < -50 dB
APC < -60 dB
UPC connectors are now commonly used for all single mode applications including high speed and DWDM networks.Â
 APC are typically only used at the transmit end of high output power lasers found in many PON and video distribution networks. Because of the angle polish, the APC connector has the best reflectance values but also has a higher insertion loss than UPC connectors.It should be noted that APC connectors should only be mated with other APC connectors. Damage to the connector may occur if an APC connector is mated with a non APC type. The APC connector boot color is green in order to identify it; non APC connector boot’s are blue (single mode fiber).When specifying connector polish, the polish acronym is written after the connector type. For example, SC type connector with ultra polish is written as SC-UPC or SC/UPC.
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