Which is the most common method for manufacturing couplers? – McqOptions

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1.	Which is the most common method for manufacturing couplers?
A.	Wavelength division multiplexing
B.	Lateral offset method
C.	Semitransparent mirror method
D.	Fused bi-conical taper (FBT) technique
Answer» E.

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A four-port multimode fiber FBT coupler has 50 μW optical power launched into port 1. The measured output power at ports 2,3 and 4 are 0.003, 23.0 and 24.5 μW respectively. Determine the excess loss.
Couplers insertion loss is same as that of excess loss.
Which is the most common method for manufacturing couplers?