VTU Optical Fiber Communication - December 2013 Exam Question Paper

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VTU Electronics and Communication Engineering (Semester 7)
Optical Fiber Communication
December 2013

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Describe block diagram of an optical fiber transmission link and explain the function of each elements in link.

8 M

1 (b) Explain what is ment by graded index optical using simple ray theroy concept indicate the major advantages of this type of fiber with regards to multimode propagation

6 M

1 (c) A grade index fiber with parabolic refractive index has n₁=1.48 and n₂=1.46 if core radius is 20?m.Find the number of modes at 1300_nm and 1550_nm

6 M

2 (a) Describe rayleigh Scrtering in optical fiber

6 M

2 (b) Briefly explain intramodal and intermodel dispersion

6 M

2 (c) Glass fiber exhibits material dispersion given by,\[ \lambda^2\left ( \frac{d^2n_1}{d\lambda_2} \right ) \] of 0.025.Determine material dispersion parameter at a wavelength of 0.85?m and estimate rms pulse broading /km for good LED source with an rms spectral width of 20nm at this wavelength.

8 M

3 (a) sketch and explain fabry perot resonator cavity of laser

7 M

3 (b) Discuss the operation of silicon RAPD with near neat diagram

7 M

3 (c) Consider a photodiode with quantum efficiency 75% when photon of energy 1.6*10^-19j, are incident on the surface then calculate opertaing wavelenghth and if 2.6?A.photo current through detector corresponding,determine incident optical power when detector is operated at ssme wavelenghth

6 M

4 (a) Describe with aid of suitaible diagram,three common techniques used for mechanical splicing of optical fibers

6 M

4 (b) with aid of simple sketches ourline major categories of fiber couplers

6 M

4 (c) A GaAs optical source that has a refractive index of 3.6 is closely coupled to step index fiber which has a core refractive index of 1.465 if the sources size is smaller than fiber core,and small gap between source and fiber is filled with a get that has a refractive index of 1.305 what is the power loss in describe from source into fiber?

8 M

5 (a) Briefly discuss the possible soureces of noise in optical fiber receivers

6 M

5 (b) discuss how the eye diagram is powerful measurement for assign the data handling capability in digiatal transmission system

8 M

5 (c) Write a note on analog receivers

6 M

6 (a) Explain the multi AM techniques employed in broadband analog application.

8 M

6 (b) Explain :
microwave photonics
RF over fiber.

6 M

6 (c) Explain in brief:
short wavelength band
chirping

6 M

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