Q.

The fibers mostly not used nowadays for optical fiber communication system are

A. single mode fibers
B. multimode step fibers
C. coaxial cables
D. multimode graded index fibers
Answer» A. single mode fibers
Explanation: single mode fibers are used to produce polarization maintaining fibers which make them expensive. also the alternative to them are multimode fibers which are complex but accurate. so, single-mode fibers are not generally utilized in optical fiber communication.
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