State the conditions for the total internal reflection to take place in optical fiber.
Define the terms: i). Numerical aperture ii). Angle of acceptance
In what way the ray paths are different in step index and graded index fibers?
In graded index optical fiber, the refractive index of core is
(a) non-uniform (b) increases towards the axis of core (c) same at core-cladding interface (d) all of these.
Differentiate between step and graded index optical fibre
Why the refractive index of the core medium slightly higher than that of cladding?
If µ1 be the refractive index of core, µ2 that of cladding and µ0 of the medium meeting end face of fibre, the value of numerical aperture (NA) can exceed 1 when
(a) µ0 = 1 (b) µ0 > 1 (c) µ2 < µ1 (d)µ2 > µ1.
Write any two major advantages of optical fiber communication over other conventional communication system.
The refractive indices of core (µ1) and cladding (µ1) of an optical fiber satisfy the relation
(a) µ1 > µ2 (b) µ1 < µ2 (c) µ1 = µ2 (d) none of them