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Fiber Optics Fundamentals Test
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Fiber Optics Fundamentals Test
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25 Questions

1. The refractive index is defined as the ratio of ____________.
2. Hydrogen absorption by optical fiber causes _______.
3. FDDI is _______.
4. Dark line defects (DLDs) occur when:
5. Intersymbol interference (ISI) in optical fibers occurs due to ______.
6. Scattering losses happen due to:
7. Graded-index fibers have:
8. IEEE 802.5 is a/an ________.
9. LASER stands for:
10. Refer to the figure above. The critical angle at the core cladding interface is given by:
11. Numerical aperture (NA) is related to the refractive indexes of core (n1) and cladding (n2) when -
12. Dark spot defects (DSD's) occur in:
13. Which one of the following is a type of non-linear scattering?
14. The fiber gyroscope is an ______.
15. Dispersion in optical fibers causes distortion in _______.
16. Dispersion is the lowest in a________.
17. Mirrors are placed in LASER optical sources to maintain conditions for ________.
18. The first generation optical fibers are fabricated from:
19. 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 _______.
20. Dispersion is low in the __________.
21. For a profile parameter (α)=1 - the profile shape of refractive index for a graded index fiber will be _______.
22. 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
23. Light emitting diodes (LED's) are:
24. For a step index fiber - relationship between numerical aperture (NA) and coupling efficiency (ηc) is ________.
25. 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.

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