Meridional rays in graded index fibers follow ____________

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Meridional rays in graded index fibers follow ____________

1.Straight path along the axis

2.Curved path along the axis

3.Path where rays changes angles at core-cladding interface

4.Helical path

Posted Date:-2022-05-06 10:24:38

More MCQS Questions and answers

  1. What is a fundamental necessity in the fabrication of fibers for light transmission?
  2. A combination of a FBG and optical isolators can be used to produce non-blocking optical wavelength division add/draw multiplexers.
  3. A device which is made of isolators and follows a closed loop path is called as a ____________
  4. A GaAs injection laser with an optical cavity has refractive index of 3.6. Calculate the reflectivity for normal incidence of the plane wave on the GaAs-air interface.
  5. A graded-index fiber has a core with parabolic refractive index profile of diameter of 30μm, NA=0.2, λ=1μm. Estimate the normalised frequency.
  6. A homo-junction is an interface between two adjoining single-crystal semiconductors with different band-gap energies.
  7. A multimode step index fiber has a normalized frequency of 72. Estimate the number of guided modes.
  8. A single mode fiber has mode field diameter 10.2μm and V=2.20. What is the core diameter of this fiber?
  9. A single-mode step-index fiber or multimode step-index fiber allows propagation of only one transverse electromagnetic wave.
  10. A step-index fiber has core refractive index 1.46 and radius 4.5μm. Find the cutoff wavelength to exhibit single mode operation. Use relative index difference as 0.25%.
  11. Absorption losses due to atomic defects mainly include ___________
  12. An FBG is developed within a fiber core having a refractive index of 1.30. Find the grating period for it to reflect an optical signal with a wavelength of 1.33μm.
  13. An optical fiber has a core radius 2μm and a numerical aperture of 0.1. Will this fiber operate at single mode at 600 nm?
  14. An optical fiber has core-index of 1.480 and a cladding index of 1.478. What should be the core size for single mode operation at 1310nm?
  15. At what temperature range, does the melting of multi components glass systems takes place?
  16. Fiber drawing using preform was useful for the production of graded index fibers.
  17. For lower bandwidth applications ______________
  18. Graded index fibers produced by liquid-phase melting techniques are less dispersive than step-index fibers.
  19. How many different categories are available for the methods of preparing optical glasses?
  20. How many implementation methods are available for optical isolators?
  21. How many mechanisms are there which causes absorption?
  22. How many propagation modes are present in single mode fibers?
  23. How many types of hetero-junctions are available?
  24. How the potential macro bending losses can be reduced in case of multimode fiber?
  25. In the given equation, state what αr suggests?
  26. It is a passive device which allows the flow of optical signal power in only one direction and preventing reflections in the backward direction.
  27. Magneto-optic devices can be used to function as isolators.
  28. Meridional rays in graded index fibers follow ____________
  29. Most of the optical power is carried out in core region than in cladding.
  30. Numerical aperture is constant in case of step index fiber.
  31. One of the given statements is true for intermodal dispersion. Choose the right one.
  32. Optical fibers suffer radiation losses at bends or curves on their paths.
  33. Plastic fibers are less widely used than glass fibers.
  34. Population inversion is obtained at a p-n junction by __________
  35. Sharp bends or micro bends causes significant losses in fiber.
  36. Skew rays follow a ___________
  37. The commercially available circulators exhibit insertion losses around ________________
  38. The difference between the modes’ refractive indices is called as ___________
  39. The effects of intrinsic absorption can be minimized by ___________
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  43. What is needed to predict the performance characteristics of single mode fibers?
  44. What is the first stage in liquid-phase-technique?
  45. What is the unit of normalized frequency?
  46. Which equation is used to calculate MFD?
  47. Which feature of an optical isolator makes it attractive to use with optical amplifier?
  48. Which materials are unsuitable for the fabrication of graded index fiber?
  49. Which of the following statements best explain the concept of material absorption?
  50. Which processes are involved in the purification stage in liquid-phase-technique?
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