VeEX OTDR FX150+ Series, User Manual

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OTDR Series e-Manual, D07-00- 076P -RevD00 Page 36 of 109
smooth surface. The main difference between UPC and PC is that the former has lower
return loss.
•
Angled Physical Contact (APC)
- The APC style produces the lowest return loss when
compared to other styles. The ferrule is polished to an angle of 8 degrees. The angle is
calculated so that it is less than the critical angle, which ensures light is not propagated
back along the fiber.
Connector Polish and Performance
Typical Return loss values are:
Polished Connector ~ -45dB
Ultra-Polished Connector ~ -55dB
Angled Polished Connector up to ~ -65dB