Optical Communication - Study Mode
[#181] A step-index fiber has core refractive index 1.46 and radius 4.5μm. Find the cutoff wavelength to exhibit single mode operation. Use relative index difference as 0.25%.
Correct Answer
(C) 1.214μm
[#182] The phenomenon which occurs when an incident wave strikes an interface at an angle greater than the critical angle with respect to the normal to the surface is called as . . . . . . . .
Correct Answer
(C) Total internal reflection
[#183] Constructive interference occur when total phase change after two successive reflections at upper and lower interfaces is equal to? (Where m is integer)
Correct Answer
(A) 2 πm
[#184] One of the given statements is true for intermodal dispersion. Choose the right one.
Correct Answer
(A) Low in single mode and considerable in multimode fiber
[#185] Consider a single mode fiber having core refractive index n1 = 1.5. The fiber length is 12m. Find the time taken by the axial ray to travel along the fiber.
Correct Answer
(B) 0.06μsec