Never get mixed up between green connector and blue connectors
Both are the same type of Singlemode.
The difference is simply at the tip of the fiber optics ferrule.
The green connector is called APC (Angled Physical Contact) and the blue connector represents PC (Physical Contact).
The difference between green (APC) and blue connector (PC) ferrule is best illustrated in the below diagram.
Angle polished contact connector should only be mated to another APC connector.
Mating a APC connectors to another non-APC connectors causes a very high insertion loss as shown in the below diagrams.
APC mated with APC
APC mated with non APC connector
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