Optical Fiber Communication Solved Paper AKTU 2019 - 20 (Answer Key)

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                                                 Optical Fiber Communication

                                                              Year - 2019 - 20

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Q1. An  incident ray can be defined as:

Ans.  a light ray directed toward a surface.

Q2. The term disperssion describes the process of 

Ans. separating light into its component frequencies

Q3. Which of the following terms describes the reason that light is refracted at different angles?

Ans. the angle is determined by the index of the materials

Q4. The term critical angle describes

Ans. the point at which light has gone from the refractive mode to the reflective mode.

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Q5. The cladding which surround the core

Ans.  Acts to help guide the light in the core.

Q6. The reflective index number is 

Ans.   A number which compares the transparency of a material with that of air.

Q7. The term single mode and multimode are best describes as

Ans.  The number of wavelengths each fiber can support.

Q8. The higher the index number 

Ans.  The higher the speed of light.

Q9. The three major groups in the optical system are

Ans.  The source, the link, and the receiver.

Q10. When connector losses, splice losses, and coupler losses are added, what is the final limiting factor?

Ans.  Detector sensitivity.

Q11. The term responsivity as it applies to a light detector is best described as

Ans.  The ratio of the diode output current to optical input power.

Q12. The term power budgeting refers to 

Ans.  The total power available minus the attenuation losses.

Q13. Optical fiber communication wavelength range is 

Ans.  

Q14. Value of wave propagation constant is 

Ans. 

Q15. Mode volume of step index fiber is given by

Ans.  A)  V2/4  

          B)  V2/2 

          C) 2V/3 

          D) None.

Q16. MFD is defined as ………………………

         (Where w0 is spot size)

Ans.  2w0

Q17. Threshold power of SRS is up to ……………. order higher than SBS.

Ans.  3.

Q18. For NRZ scheme data rate is ……………the bandwidth Hz.

Ans.  

Q19. Signal dispersion is least in …………

Ans.  

Q20. For triangular profile what should the value of the profile parameter in G.I fiber.

Ans.  1.

Q21. What is the principle of fiber optical communication?

Ans.  Total internal reflection.

Q22. What is the other name for a maximum external incident angle?

Ans.  Acceptance angle.

Q23. Which of the following has more distortion?

Ans.  Multimode step-index fibre.

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