Engineering Physics Unit 4 Notes AKTU (BAS101)

AKTU · BTECH · Semester 1, 2 · Engineering Physics · Unit 4 · Notes

AKTU Engineering Physics (BAS101) Unit 4 notes for B.Tech Semester 1/2 – Fiber Optics and Laser. Topics: Optical Fiber Basics, Fiber Optic Communication…

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Unit 4: Fiber Optics and Laser – AKTU syllabus topics

  • Optical Fiber Basics: Principle and Construction Fiber, Numerical Aperture Acceptance Angle, Step Index and Graded Index Fiber
  • Fiber Optic Communication: Attenuation and Dispersion, Applications of Optical Fiber
  • Laser Fundamentals: Spontaneous Stimulated Emission, Einstein Coefficients Population Inversion, Principle of Laser Action
  • Types of Lasers: Ruby Laser Solid State, He-Ne Gas Laser, Laser Applications

Most asked AKTU PYQ questions from Unit 4

  1. Q6a. Explain the term acceptance angle, acceptance cone and numerical aperture of an optical fiber with labelled diagram and derive expression for numerical aperture in terms of relative refractive index difference. (7 marks, 2024-25)
  2. Q6b. Explain the construction and working of He-Ne laser with proper-labelled diagram. (7 marks, 2024-25)
  3. Q7a. What do you mean by acceptance angle and numerical aperture? Derive the expressions for acceptance angle and numerical aperture. (10 marks, 2021-22)
  4. Q7b. What do you understand by the stimulated emission? Discuss the He-Ne laser by giving its construction and working. How He-Ne laser is superior to the Ruby laser? (10 marks, 2021-22)
  5. Q2e. What do you understand by attenuation and dispersion in an optical fibre. A communication system uses a 25 km long fibre having a loss of 2.5 dB/km. The input power is 2500 µW, compute the output power. (10 marks, 2020-21)
  6. Q7a. Illustrate the construction and working of He-Ne laser? Discuss important applications of laser. (10 marks, 2020-21)
  7. Q7b. Derive expressions for acceptance angle and numerical aperture. (10 marks, 2020-21)
  8. Q6a. Describe the construction and working principle of a He-Ne laser with the help of a suitable diagram. (7 marks, 2025-26)
  9. Q2c. Discuss construction and working of He-Ne Laser. (7 marks, 2024-25)
  10. Q6a. Explain acceptance angle and acceptance cone of optical fiber. Derive expression for them. (7 marks, 2023-24)

AKTU paper codes: BAS101, BAS201, KAS101, KAS201

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