MCQs > Electronics & Appliances > Fiber Optics MCQs > General MCQs

General Fiber Optics MCQs

1. Rayleigh scattering is a ________.

2. What does TPON stand for?

3. When microwave frequency rather than radio frequency subcarriers are employed, the strategy is usually referred to as ______.

4. Quantum efficiency (η) is defined as

5. The refractive index is defined as the ratio of ____________.

6. One polarization maintaining fiber operates at a wavelength of 1.5 µm and has a beat length of 0.6mm. Its modal birefringence is given by _______.

7. The Nd:YAG LASER is a/an_______.

8. A multimode graded index fiber exhibits total pulse broadening of 0.2 µsec over a distance of 10Km. Estimate the maximum possible bandwidth assuming that there is no inter-symbol interference.

9. Which phenomenon does not let light rays escape an optical fiber?

10. What is signal attenuation in an optical fiber where P1=Input power and P0=Output power

11. Surface emitter LEDs have high radiance because _______.

12. Optical bandwidth (OB) relates to electrical bandwidth (EB) when

13. Metallic impurities are eliminated from optical fiber by:

14. IEEE 802.5 is a/an ________.

15. Graded-index fibers have:

16. What would the optical return loss (ORL) be defined as when r-fresnal reflection occurs at a fiber-air interface?

17. Optical time domain reflectometry (OTDR) is a/an ________.

18. Intermodal dispersion is less in a __________.

19. Scattering losses happen due to:

20. Numerical aperture (NA) is related to the refractive indexes of core (n1) and cladding (n2) when,

21. Avalanche photodiodes are ________.

22. Dispersion is the lowest in a________.

23. Dispersion is low in the __________.

24. SOLITON is a/an ______.

25. The vapor-phase deposition technique is used to produce _______.

26. For an ideal photo detector, the absorption coefficient must be ______.

27. COBRA (commutateur optique binaire rapide) is an ________.

28. The LASER is a/an

29. Mirrors are placed in LASER optical sources to maintain conditions for ________.

30. For a multimode optical graded index fiber, the profile parameter (α) will be equal to:

31. FDDI can support a data rate of

32. Intersymbol interference (ISI) in optical fibers occurs due to ______.

33. When optical power is incident on the photo detector during the 0 bit period, then the system is said to exhibit _______.

34. For a profile parameter (α)=1, the profile shape of refractive index for a graded index fiber will be _______.

35. Which one is an Optical System Design Software?

36. Which one is a type of non-linear scattering?

37. The rays which travel in a helical path through an optical fiber are called ______.

38. The cutback technique is a/an _______.

39. The first generation optical fibers are fabricated from:

40. Which one is a fiber dispersion measurement method?

41. Which one is a characteristic of an injection LASER?

42. The population inversion phenomenon in optical sources occurs when _________.

43. Total internal reflection takes place at angles ________.

44. The output power of a LASER is greater than that of a LED because of _____.

45. Index optical fibers are sometimes referred to as:

46. Germanium avalanche photodiodes can be used for _______.

47. LASER stands for:

48. What is the thermal noise current it in a resistor R expressed in its mean square value? where, K is Boltzmann's constant, T is absolute temperature and B is the bandwidth

49. Macro bending losses in optical fibers can be reduced by designing the fibers with ________.

50. LED is more suitable for analog transmission because of its _______.

51. Dark line defects (DLDs) occur when:

52. The information carrying capacity of optical fibers is in the range of:

53. In p-i-n photodiodes 'i' stands for:

54. Superluminescent LED's are preferred because of _______.

55. What happens when dispersion occurs?

56. FDDI is _______.

57. Hydrogen absorption by optical fiber causes _______.

58. Near-field scanning method is used to measure:

59. Homodyne detection is used for _______.

60. Germanium photodiodes are generally not preferred in the optical fiber system because of _________.