Optical communication questions with answers
80 multiple-choice questions. Open any question for its answer and explanation.
- When three wave components co-propagate at angular frequency w1, w2, w3, then a new wave is generated at frequency w4, which is given by?
- The ratio of speed of light in air to the speed of light in another medium is called as . . . . . . . .
- Estimate 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.
- Which law gives the relationship between refractive index of the dielectric?
- A device that reduces the intensity of light in optical fiber communications is . . . . . . . .
- High frequency optical phonon is generated in stimulated Raman scattering.
- Raman and Brillouin scattering are usually observed at . . . . . . . .
- Mie scattering has in-homogeneities mainly in . . . . . . . .
- After Total Internal Reflection the Meridional ray . . . . . . . .
- Digital transmission is more likely to be affected by modal noise.
- Losses in photonic crystal fibers are reduced to a level of . . . . . . . .
- In index-guided photonic crystal fiber structure, the dark areas are air holes. What does white areas suggests?
- Which of the following is not a metallic impurity found in glass in extrinsic absorption?
- Plastic fibers are less widely used than glass fibers.
- Disturbance along the fiber such as vibrations, discontinuities, connectors, splices, source/detectors coupling result in . . . . . . . .
- The . . . . . . . . . ray passes through the axis of the fiber core.
- The effects of intrinsic absorption can be minimized by
- The phonon is a quantum of an elastic wave in a crystal lattice.
- The optical fiber incurs a loss in signal power as light travels down the fiber which is called as . . . . . . . .
- Stimulated Brillouin scattering is mainly a . . . . . . . .
- Dominant intrinsic loss mechanism in low absorption window between ultraviolet and infrared absorption tails is . . . . . . . .
- Self-phase modulation can be used for . . . . . . . .
- Which equations are best suited for the study of electromagnetic wave propagation?
- Numerical aperture is constant in case of step index fiber.
- . . . . . . . . zsemiconductor laser sources generally have broader bandwidths.