91. In the design of a single-mode step index optical fiber close to upper cutoff, the single-mode operation is not preserved if
92. Total internal reflection at the fibre wall can occur only if two conditions are met. One of the condition is the glass inside the fibre core must have a/an . . . . . . . . index of refraction than/as the index of refraction of the material surrounding the fibre core.
93. Which one of the following fibers has the distinct advantage of low intermodal dispersion?
94. An optical link uses a fiber having a power loss of 1 dB/km. A typical photo detector has responsivity 0.5 A/W. If the link is 3 km long and the detector is required to produce a current of 25 µA, the required transmitted power is
95. The least attenuation of standard single mode optical fibers are at
96. Coherent radiation in LASER is caused by
97. A multimode step index fiber with a core diameter of 80 µm and a relative index difference of 1.5% is operating at a wavelength of 0.85 µm . If the core refractive index is 1.48, then the normalized frequency for the fiber is
98. Consider the following advantages of optical fiber-cables:
1. Small diameter
2. Immunity to cross talk and electromagnetic interference
3. Laser and LED modulation methods lend themselves ideally to digital operation.
Which of these advantages are correct?
1. Small diameter
2. Immunity to cross talk and electromagnetic interference
3. Laser and LED modulation methods lend themselves ideally to digital operation.
Which of these advantages are correct?
99. What is the device used for measuring the power in an optical signal?
100. Polarization mode dispersion (PMD) is mainly observed in
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