Estimate RMS pulse broadening per km due to intermodal dispersion for multimode step index fiber where length of fiber is 4 km and pulse broadening per km is 80.6 ns.

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Estimate RMS pulse broadening per km due to intermodal dispersion for multimode step index fiber where length of fiber is 4 km and pulse broadening per km is 80.6 ns.

1.18.23ns/km

2.20.15ns/km

3.26.93ns/km

4.10.23ns/km

Posted Date:-2022-05-06 09:47:56

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  1. _________ can potentially provide spectral conservation through the use of multilevel signalling.
  2. Practical pulse broadening value for graded index fiber lies in the range of __________
  3. ________ does not require an external modulator.
  4. ___________ offers the potential for improving the coherent optical receiver sensitivity by increasing the choice of signalling frequencies.
  5. _____________ is essentially a crude form of Amplitude shift keying.
  6. ______________ is also referred to as on-off keying (OOK).
  7. 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.
  8. A decibel may be defined as the ratio of input and output optical power for a particular optical wavelength.
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  10. 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.
  11. A multimode step-index fiber has a core refractive index of 1.5 and relative refractive index difference of 1%. The length of the optical link is 6 km. Estimate the RMS pulse broadening due to intermodal dispersion on the link.
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  13. Almost _________ of the transmitter power is wasted in the use of external modulators.
  14. An alternative modification of the dispersion characteristics of single mode fibers involves achievement of low dispersion gap over the low-loss wavelength region between __________
  15. An optical fiber behaves as a birefringence medium due to differences in ___________
  16. Beat length of a single mode optical fiber is 0.6cm. Calculate the difference between propagation constants for the orthogonal modes.
  17. 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.
  18. Conventional optical fibers has more transmission losses than photonic crystal fibers.
  19. Digital transmission is more likely to be affected by modal noise.
  20. Dispersion-shifted single mode fibers are created by __________
  21. Disturbance along the fiber such as vibrations, discontinuities, connectors, splices, source/detectors coupling result in __________
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  29. Intermodal dispersion in multimode fibers is minimized with the use of step-index fibers.
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