A _____________ coupler comprises a number of cascaded stages, each incorporating three or four-port FBT couplers to obtain a multiport output.

A _____________ coupler comprises a number of cascaded stages, each in

1.	A _____________ coupler comprises a number of cascaded stages, each incorporating three or four-port FBT couplers to obtain a multiport output.
A.	Star
B.	Ladder
C.	WDM
D.	Three-port
Answer» B. Ladder

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