[Solved] Which is the most common method for manufacturing couplers?

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Q.	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» D. fused bi-conical taper (fbt) technique
Explanation: the fbt technique is basic and simple. in this technique, the fibers are generally twisted together and then spot fused under tension such that the fused section is elongated to form a bi-conical taper structure. a three port coupler can be obtained by removing one of the input fibers.

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