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Optical Communication: Transmission Characteristics of Optical Fiber
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Optical Communication: Transmission Characteristics of Optical Fiber
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25 Questions

1. Raman and Brillouin scattering are usually observed at ___________
2. Disturbance along the fiber such as vibrations, discontinuities, connectors, splices, source/detectors coupling result in __________
3. Dominant intrinsic loss mechanism in low absorption window between ultraviolet and infrared absorption tails is ___________
4. A multimode fiber has RMS pulse broadening per km of 12ns/km and 28ns/km due to material dispersion and intermodal dispersion resp. Find the total RMS pulse broadening.
5. Dispersion-shifted single mode fibers are created by __________
6. A multimode graded index fiber exhibits a total pulse broadening of 0.15μsover a distance of 16 km. Estimate the maximum possible bandwidth, assuming no intersymbol interference.
7. Rayleigh scattering can be reduced by operating at smallest possible wavelengths.
8. A single-mode optical fiber has an attenuation of 0.3dB/km when operating at wavelength of 1.1μm. The fiber core diameter is 4μm and bandwidth is 500 MHz. Find threshold optical power for stimulated Brillouin scattering.
9. The variant of non-zero-dispersion-shifted fiber is called as __________
10. An alternative modification of the dispersion characteristics of single mode fibers involves achievement of low dispersion gap over the low-loss wavelength region between __________
11. The fibers which relax the spectral requirements for optical sources and allow flexible wavelength division multiplying are known as __________
12. Rayleigh scattering and Mie scattering are the types of _____________
13. Sharp bends or micro bends causes significant losses in fiber.
14. For no overlapping of light pulses down on an optical fiber link, the digital bit rate BT must be ___________
15. An optical fiber behaves as a birefringence medium due to differences in ___________
16. A multimode step index fiber has source of RMS spectral width of 60nm and dispersion parameter for fiber is 150psnm-1km-1. Estimate rms pulse broadening due to material dispersion.
17. Which type of scattering occurs due to interaction of light in a medium with time dependent optical density variations thereby resulting into the change of energy (frequency) & path?
18. Practical pulse broadening value for graded index fiber lies in the range of __________
19. The modal noise can be reduced by __________
20. A 4 km optical link consists of multimode step index fiber with core refractive index of 1.3 and a relative refractive index difference of 1%. Find the delay difference between the slowest and fastest modes at the fiber output.
21. Stimulated Raman scattering occur in ___________
22. Consider a single mode fiber having core refractive index n1= 1.5. The fiber length is 12m. Find the time taken by the axial ray to travel along the fiber.
23. The beat length in a single mode optical fiber is 8 cm when light from a laser with a peak wavelength 0.6μm is launched into it. Estimate the modal birefringence.
24. The scattering resulting from fiber imperfections like core-cladding RI differences, diameter fluctuations, strains, and bubbles is?
25. Practical pulse broadening value for graded index fiber lies in the range of __________

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