This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “Photonic Crystal Fibers & Attenuation”.
1. Conventional optical fibers has more transmission losses than photonic crystal fibers.
2. When the input and output power in an optical fiber is 120μW & 3μW respectively and the length of the fiber is 8 km. What is the signal attenuation per km for the fiber?
3. Losses in photonic crystal fibers are reduced to a level of ___________
4. Photonic crystal fibers also called as ___________
a) Conventional fibers
b) Dotted fibers
c) Stripped fibers
d) Holey fibers
5. The high index contrast enables the PCF core to be reduced from around 8 μmin conventional fiber to ___________
a) Less than 1μm
b) More than 5μm
c) More than 3μm
d) More than 2μm
6. A device that reduces the intensity of light in optical fiber communications is ___________
b) Optical attenuator
7. In index-guided photonic crystal fiber structure, the dark areas are air holes. What does white areas suggests?
8. The optical fiber incurs a loss in signal power as light travels down the fiber which is called as ___________
9. The periodic arrangement of cladding air holes in photonic band gap fibers provides for the formation of a photonic band gap in the ___________
a) H-plane of fiber
b) E-plane of fiber
c) E-H-plane of fiber
d) Transverse plane of fiber
10. Which is the unit of measurement of attenuation in optical fibers?
11. If the input power 100μW is launched into 6 km of fiber, the mean optical power at the fiber output is 2μW. What is the overall signal attenuation through the fiber assuming there are no connectors or splices?
12. A decibel may be defined as the ratio of input and output optical power for a particular optical wavelength.