71. An optical fiber communication system works on a wavelength of 1.3 µm. The number of subscribers it can feed, if a channel requires 20 kHz, is
72. Approximately what is the frequency limit of an optical fiber?
73. Which one of the following specifications does not fit for a single-mode fiber?
74. On which bands, do the optical fibers operate?
1. Ultra violet band
2. Ultra high frequency band
3. Visible light band
4. Infrared band
Select the correct answer from the options given below:
1. Ultra violet band
2. Ultra high frequency band
3. Visible light band
4. Infrared band
Select the correct answer from the options given below:
75. Numerical aperture is closely related to acceptance angle and is the figure of merit commonly used to measure
76. The Bragg's Law of X-ray diffraction is:
77. For a 3-µm-diameter optical fiber with core and cladding indexes of refraction of 1.545 and 1.510, respectively. The cut off wavelength is.
78. Sensitivity of optical receivers is measured in
79. If a light travels in a certain medium and it gets reflected off an optically denser medium with high refractive index, then it is regarded as . . . . . . . .
80. In a optical fiber, the refractive index of the cladding material should be
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