61. . . . . . . . . is used to describe the light gathering or light collecting ability of an optical fiber
62. A step index fibre has core diameter 40 µm with core refractive indix of 1.3 and numerical aperture 0.5, then the refractive index of cladding is
63. Refractive index of glass is 1.5. What is the wavelength of a beam of light with a frequency of 1014 Hz in glass? Assume velocity of light in vacuum to be 3 × 108 m/sec.
64. The concept used in the scheme of WDM is similar to
65. Which of the following introduces mode partition noise?
66. The working of an optical fiber is bases on
67. If a fiber operates at 1400 nm with the diameter of about 10 µm, n1 = 1.30, ∆ = 0.80%, V = 3.5, then how many modes will it have?
68. Fibers have numerical aperture (NA) in the region of 0.15 to 0.4. Fibers with higher N.A. values generally exhibit
69. The fiber splice is a . . . . . . . . joint between 2 fibers.
70. At critical radius of curvature, in multimode fibers
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