[PPSC SOs (Ballistics, Documents Photography, AudioVoice) SAs (Ballistics, Photography AudioVoice) 2023]

42. Why do Step index Single mode fibers are used in long distance communication?

Select the correct answer(s).
1. Low signal loss in single mode fiber
2. No modal dispersion in single mode fiber
3. Single mode fiber has high modal dispersion
4. Refractive index of single mode fiber gradually changes, this will help in long distance communication.

1. 1 and 3 only

2. 1 and 2 only

3. 2 and 4 only

4. 3 and 4 only

Correct Answer :

1 and 2 only