VTU Optical Fiber Communication - June 2012 Exam Question Paper

VTU Electronics and Communication Engineering (Semester 7)
Optical Fiber Communication
June 2012

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) What are the advantages of optical fiber commumnication?Expalin in detail.

6 M

1 (b) Explain briefly the fiber materials

7 M

1 (c) with a neat diagram ,expalin the photonic crystal fibers,in optical fiber communication.

7 M

2 (a) Expain the macro bending loss in optical fiber.

6 M

2 (b) expain the following terms in optical communication;
attenuation
absorption
Scatttering losses
(note:Mathmatical expression and graphs may be given wherever necessary)

7 M

3 (a) Give comparison between laser diode and light emitting diode.considering the various parameter.

6 M

3 (b) A double heterojunction InGaAsp LED emitting at a peak wavelength of 1310_nmhas radiative and non radiative recombination times of 30 and 10_ns respectivly.The drive current is 40mA.calculate the:
bulk recombination lifetime
internal quantum efficinency
Internal powerlevel.

7 M

3 (c) Explain the operation of avalanche photo diode with schematic diagram and seprate

7 M

4 (a) Expalin the example of possible Lensing schemes used to improve optical source to fiber coupling efficiency?

6 M

4 (b) What is fiber splicing?Expalin the fussion splicing of optical fibers with relevant diagram.

7 M

4 (c) What are the principle requirements of a good connector ?Explain the alignment scheme used tapered-sleeve fiber-optic connector with relvant diagram

7 M

5 (a) Explain the receiver sensitivity of an optical receiver.Drive an expression for receiver sensitivity.

6 M

5 (b) Explain the general configuaration of an eye diagram showing the defination of fundamental measurements parameter.and also explin noise margin and timing jiter parameters

7 M

5 (c) Expalin the operation of Burst mode receiver data pattern and signal level variation in pulses

7 M

6 (a) Expalin the operation of multi-channel amplitude modulation standard technique for frequency division multiplexing of N independent information bearing signals.

7 M

6 (b) Explain the radio-over-fiber links with a concept of a broadband wireless access network for interconnecting antenna base station with the central controlling office.

6 M

6 (c) Expalain the link power budget,with a relevent diagram

7 M

7 (a) Explain the wavelenghth division multiplexing network containg various type of optical amplifires

7 M

7 (b) Explain the optical Isolator with a design and operation of a polarization independent isolator mode of three mainature optical components

6 M

7 (c) Explian the operation of optical Add/Drop multiplexers,with a relevant diagram

7 M

8 (a) Explain the configuration of SONET/SDH rings,with relevant digrams

10 M

8 (b) Write notes on the following:
optical amplifier
High speed light wave links

10 M

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