81. Which one of the following statement is correct?
The model noise in multimode fibers cannot be reduced by
The model noise in multimode fibers cannot be reduced by
82. For a photo-diode with responsivity of 0.50 A/W & optical power of about 12 µW, what would be the value of generated photocurrent?
83. Generally, the SM fiber will have a core diameter of
84. Optical storage devices employ
85. For a silica fiber the refractive index of core layer is 1.56 and that of cladding is 1.35. Calculate numerical aperture
86. The bandwidth of the optical signal having a rise time (response time) tr is 500 MHz. Find the value of rise time.
87. The modal dispersion in a fiber is 20 ns/km. What will be the overall pulse spread in 10 km long fiber? Assume material dispersion to be zero
88. Which is the transmission medium for VLF electromagnetic waves especially applicable for aeronautical and submarine cables?
89. When the mean optical power launched into an 8 km length of fiber is 120 µW. The mean optical power at the fiber output is 3 µW. Find the signal attenuation
90. Not an example for actuator
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