Q. The phonon is a quantum of an elastic wave in a crystal lattice.

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Q. A single-mode optical fiber has an attenuation of 0.3 dB/km when operating at wavelength of 1.1 μm. The fiber core diameter is 4 μm and bandwidth is 500 MHz. Find threshold optical power for stimulated Brillouin scattering.

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Q. 0.4 dB/km, 1.4 μm, 6 μm, 550MHz. Find threshold optical power for stimulated Raman scattering.

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Q. Stimulated Brillouin scattering is mainly a ___________

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Q. High frequency optical phonon is generated in stimulated Raman scattering.

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Q. Stimulated Raman scattering occur in ___________

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Q. Stimulated Raman scattering may have an optical power threshold of may be three orders of magnitude ___________

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Q. What is dispersion in optical fiber communication?

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Q. What does ISI stand for in optical fiber communication?

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Q. For no overlapping of light pulses down on an optical fiber link, the digital bit rate BT must be ___________

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Q. The maximum bit rate that may be obtained on an optical fiber link is 1/3Γ.

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Q. 3 dB optical bandwidth is always ___________ the 3 dB electrical bandwidth.

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Q. A multimode graded index fiber exhibits a total pulse broadening of 0.15 μs over a distance of 16 km. Estimate the maximum possible bandwidth, assuming no intersymbol interference.

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Q. What is pulse dispersion per unit length if for a graded index fiber, 0.1 μs pulse broadening is seen over a distance of 13 km?

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Q. Chromatic dispersion is also called as intermodal dispersion.

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Q. The optical source used in a fiber is an injection laser with a relative spectral width σλ/λ of 0.0011 at a wavelength of 0.70 μm. Estimate the RMS spectral width.

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Q. In waveguide dispersion, refractive index is independent of ______________

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Q. Intermodal dispersion occurring in a large amount in multimode step index fiber results in ____________

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Q. After Total Internal Reflection the Meridional ray __________

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Q. Consider a single mode fiber having core refractive index n1= 1.5. The fiber length is 12 m. Find the time taken by the axial ray to travel along the fiber.

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