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Optical Communication: Optical Fiber and their properties
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Optical Communication: Optical Fiber and their properties
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25 Questions

1. What is the other name for a maximum external incident angle?
2. 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.
3. A fibre optic telephone transmission can handle more than thousands of voice channels.
4. What is the principle of fibre optical communication?
5. Which of the following loss occurs inside the fibre?
6. Which of the following has more distortion?
7. A single mode fiber has mode field diameter 10.2μm and V=2.20. What is the core diameter of this fiber?
8. The light sources used in fibre optics communication are ____________
9. A single mode fiber has a beat length of 4cm at 1200nm. What is birefringence?
10. 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?
11. Which is the most important velocity in the study of transmission characteristics of optical fiber?
12. When more than one mode is propagating, how is it dispersed?
13. What is needed to predict the performance characteristics of single mode fibers?
14. What is the unit of normalized frequency?
15. Calculate the numerical aperture of an optical fibre whose core and cladding are made of materials of refractive index 1.6 and 1.5 respectively.
16. Which equation is used to calculate MFD?
17. Who proposed the use of clad waveguide structure?
18. Who proposed the idea of transmission of light via dielectric waveguide structure?
19. A single mode fibre has low intermodal dispersion than multimode.
20. Most of the optical power is carried out in core region than in cladding.
21. The phenomenon which occurs when an incident wave strikes an interface at an angle greater than the critical angle with respect to the normal to the surface is called as ____________
22. Light incident on fibers of angles________the acceptance angle do not propagate into the fiber.
23. In which of the following there is no distortion?
24. 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%.
25. Which of the following is known as fibre optic back bone?

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