The signals which are obtained by encoding each quantized signal into a digital word is called as

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The signals which are obtained by encoding each quantized signal into a digital word is called as

1.PAM signal

2.PCM signal

3.FM signal

4.Sampling and quantization

Posted Date:-2022-05-06 17:07:49

More MCQS Questions and answers

  1. Practical pulse broadening value for graded index fiber lies in the range of __________
  2. _________ can potentially provide spectral conservation through the use of multilevel signalling.
  3. 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.
  4. A decibel may be defined as the ratio of input and output optical power for a particular optical wavelength.
  5. A device that reduces the intensity of light in optical fiber communications is ___________
  6. 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.
  7. 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.
  8. After Total Internal Reflection the Meridional ray __________
  9. Almost _________ of the transmitter power is wasted in the use of external modulators.
  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. An optical fiber behaves as a birefringence medium due to differences in ___________
  12. Beat length of a single mode optical fiber is 0.6cm. Calculate the difference between propagation constants for the orthogonal modes.
  13. 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.
  14. Conventional optical fibers has more transmission losses than photonic crystal fibers.
  15. Digital transmission is more likely to be affected by modal noise.
  16. Dispersion-shifted single mode fibers are created by __________
  17. Disturbance along the fiber such as vibrations, discontinuities, connectors, splices, source/detectors coupling result in __________
  18. Eight level FSK and binary PSK yields an equivalent sensitivity.
  19. 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.
  20. External modulation for ________ modulation format allows the most sensitive coherent detection mechanism.
  21. For many applications that involve optical fiber transmission, an intensity modulation optical source is not required.
  22. For suitable power confinement of fundamental mode, the normalized frequency v should be maintained in the range 1.5 to 2.4μm and the fractional index difference must be linearly increased as a square function while the core diameter is linearly reduced to keep v constant. This confinement is achieved by?
  23. 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?
  24. In index-guided photonic crystal fiber structure, the dark areas are air holes. What does white areas suggests?
  25. Intermodal dispersion in multimode fibers is minimized with the use of step-index fibers.
  26. Intermodal dispersion occurring in a large amount in multimode step index fiber results in ____________
  27. Losses in photonic crystal fibers are reduced to a level of ___________
  28. Most of the power in an optical fiber is transmitted in fiber cladding.
  29. Non-zero-dispersion-shifted fiber was introduced in the year 2000.
  30. ny amount of stress occurring at the core-cladding interface would be reduced by grading the material composition.
  31. Photonic crystal fibers also called as ___________
  32. Polarization modal noise can _________ the performance of communication system.
  33. The differential attenuation of modes reduces intermodal pulse broadening on a multimode optical link.
  34. The digital transmission on implementation of polarization modulation which involves polarization characteristics of the transmitted optical signal is known as _____________
  35. The fibers which relax the spectral requirements for optical sources and allow flexible wavelength division multiplying are known as __________
  36. The high index contrast enables the PCF core to be reduced from around 8 μmin conventional fiber to ___________
  37. The line width in the range ________ of bit rate is specified for ASK heterodyne detection.
  38. The modal noise can be reduced by __________
  39. The modal noise occurs when uncorrected source frequency is?
  40. The optical fiber incurs a loss in signal power as light travels down the fiber which is called as ___________
  41. The optical source used for detection of optical signal is ____________
  42. The periodic arrangement of cladding air holes in photonic band gap fibers provides for the formation of a photonic band gap in the ___________
  43. The signals which are obtained by encoding each quantized signal into a digital word is called as
  44. The variant of non-zero-dispersion-shifted fiber is called as __________
  45. 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?
  46. Which is the unit of measurement of attenuation in optical fibers?
  47. ________ does not require an external modulator.
  48. ___________ offers the potential for improving the coherent optical receiver sensitivity by increasing the choice of signalling frequencies.
  49. _____________ is essentially a crude form of Amplitude shift keying.
  50. ______________ is also referred to as on-off keying (OOK).
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