Which color is associated with UPC single-mode connectors and what effect does it have?

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Multiple Choice

Which color is associated with UPC single-mode connectors and what effect does it have?

Explanation:
Blue indicates UPC single-mode connectors. UPC uses a very flat, highly polished end-face that mates with the opposing fiber so the contact is nearly perfect and the air gap is minimized. This reduces the light that reflects back at the interface—i.e., it lowers Fresnel reflection—leading to better return loss. (APC connectors, which are green, use an angled end-face to deflect reflections away.)

Blue indicates UPC single-mode connectors. UPC uses a very flat, highly polished end-face that mates with the opposing fiber so the contact is nearly perfect and the air gap is minimized. This reduces the light that reflects back at the interface—i.e., it lowers Fresnel reflection—leading to better return loss. (APC connectors, which are green, use an angled end-face to deflect reflections away.)

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