________ couplers combine the different wavelength optical signal onto the fiber or separate the different wavelength optical signal output from the fiber.

________ couplers combine the different wavelength optical signal onto

1.	________ couplers combine the different wavelength optical signal onto the fiber or separate the different wavelength optical signal output from the fiber.
A.	3-port
B.	2*2-star
C.	WDM
D.	Directional
Answer» D. Directional

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