Below are the answers key for Frenzel Self-test in Chapter 13: Fiber-Optics Communications from the book COMMUNICATIONS ELECTRONICS by Louis E. Frenzel. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
1. light
2. voice, video, computer data
3. telephone systems
4. glass, plastic
5. wide bandwidth
6. false
7. true
8. brittleness, difficult to work with
9. LEDs, semiconductor lasers
10. binary or digital pulses
11. photocell or light detector
12. repeaters
13. electromagnetic
14. pipe
15. b (Straight line)
16. micrometers (microns), nanometers
17. a (Red)
18. one-millionth, meter
19. 400, 700
20. b (More than 700 nm)
21. visible, infrared, ultraviolet
22. 300,000,000; 186,000
23. true
24. index, refraction
25. reflection, mirror
26. refraction
27. 30
28. critical
29. reflection
30. index, refraction
31. b (Glass)
32. cladding
33. glass, plastic
34. a (Core)
35. multimode step-index, single-mode step-index, multimode graded-index
36. modal dispersion
37. multimode step-index,
38. multimode graded-index, single-mode step-index
39. b (Decrease)
40. index, refraction
41. c (2 to 15 m)
42. protective coating
43. Kevlar
44. 2, 6, 12, 18, 24
45. attenuation
46. dispersion, absorption, scattering
47. decibels, kilometer
48. 31
49. false
50. a (40 ft.)
51. 76
52. true
53. connectors
54. LED. laser
55. 1.3
56. false
57. gallium arsenide
58. monochromatic
59. coherence
60. laser
61. resonant cavity
62. forward
63. ILD
64. ILD
65. reverse
66. leakage
67. avalanche photodiode
68. amplifier, comparator-or shaper
69. 30
70. 6.17. 18.5 (10 and 30 km)
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