Q121
Open questionRaman and Brillouin scattering are usually observed at . . . . . . . .
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ECE · all questionsOptical Communication
Optical Communication
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Q122
Open questionWhen light is described as an electromagnetic wave, it consists of a periodically varying electric E and magnetic field H which are oriented at an angle?
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Q123
Open questionOptical fibers suffer radiation losses at bends or curves on their paths.
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Q124
Open questionThe modal noise can be reduced by . . . . . . . .
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Q125
Open questionBeat length of a single mode optical fiber is 0.6cm. Calculate the difference between propagation constants for the orthogonal modes.
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Q126
Open questionWhen three wave components co-propagate at angular frequency w1, w2, w3, then a new wave is generated at frequency w4, which is given by?
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Q127
Open questionA monochromatic wave propagates along a waveguide in z direction. These points of constant phase travel in constant phase travel at a phase velocity Vp is given by?
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Q128
Open questionA single-mode optical fiber has an attenuation of 0.3dB/km when operating at wavelength of 1.1μm. The fiber core diameter is 4μm and bandwidth is 500 MHz. Find threshold optical power for stimulated Brillouin scattering.
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Q129
Open questionThe ratio of speed of light in air to the speed of light in another medium is called as . . . . . . . .
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Q130
Open questionEstimate RMS pulse broadening per km due to intermodal dispersion for multimode step index fiber where length of fiber is 4 km and pulse broadening per km is 80.6 ns.
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Q131
Open questionA multimode fiber has refractive indices n1 = 1.15, n2 = 1.11 and an operating wavelength of 0.7μm. Find the radius of curvature?
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Q132
Open questionFor suitable power confinement of fundamental mode, the normalized frequency v should be maintained in the range 1.5 to 2.4μm and the fractional index difference must be linearly increased as a square function while the core diameter is linearly reduced to keep v constant. This confinement is achieved by?
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Q133
Open questionMultimode step index fiber has
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Q134
Open questionIn graded index multimode optical fiber the refractive index of the core is
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Q135
Open questionAssuming that packet transmission and retransmission can both be described as a Poisson process, calculate the probability that a data packet transmission in an S-ALOHA system will experience a collision with another user. Assume the total traffic rate λt = 10 packet/sec and the packet duration τ = 10 msec.
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Q136
Open questionLight may be propagated along a fiber-optic cable in which of the following modes?
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Q137
Open questionWhich one of the following is the correct statement?
The graded index optical fiber cables can be considered to have
The graded index optical fiber cables can be considered to have
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Q138
Open questionA glass fiber has refractive indices n1 of 1.5 and n2 of 1. Assuming c = 3 × 108 m/s, the multipath time dispersion will be
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Q139
Open questionThe normalized frequency of a step index fiber is 28 at 1300 nm wavelength. What is the total number (approx) of guided modes that can be supported by the fiber
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Q140
Open questionIn single - mode fibers, how does the fraction of energy travelling through bound mode appears in the cladding?
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