31. The light sources used in fibre optics communication are . . . . . . . .
32. Which of the following is not a metallic impurity found in glass in extrinsic absorption?
33. What is dispersion in optical fiber communication?
34. 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%.
35. 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 . . . . . . . .
36. Constructive interference occur when total phase change after two successive reflections at upper and lower interfaces is equal to? (Where m is integer)
37. One of the given statements is true for intermodal dispersion. Choose the right one.
38. 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.
39. A single-mode step-index fiber or multimode step-index fiber allows propagation of only one transverse electromagnetic wave.
40. Numerical aperture is constant in case of step index fiber.
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