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Posted By: Sriram Member Level: Diamond Posted Date: 18 Jun 2008
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2006 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech OPTICAL COMMUNICATION Question paper
Code No: NR410404 NR
IV B.Tech I Semester Supplementary Examinations, November 2006
OPTICAL COMMUNICATION
( Common to Electronics & Communication Engineering and Electronics &
Telematics)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Bring out a brief historical development of optical fiber communication. [6]
(b) Draw the block schematic of a general communication system and explain
about each block. [4+6]
2. (a) Explain the power flow in step index fibers in detail. [6]
(b) Compare the fiber structure and numerical aperture in Step index and Graded
Index fibers. [5+5]
3. (a) Two step index fibers one of which is of mono mode type and the other one
in the multimode type have the following parameters:
The mono mode fiber has a core diameter of 8µm and core refractive index of
1.5.
The relative refractive index difference between the core and cladding is 0.3%
The operating wavelength is 1.55µm . Calculate the critical radius of curvature
at which bending losses occur in the fiber
(b) With the help of relevant expressions explain material dispersion and waveguide
dispersion. [8+8]
4. (a) With respect to LED what is internal quantum efficiency and derive the expression
for the lifetime reduction caused by interfacial recombination. [3+5]
(b) If the radiative and non radiative recombination lifetimes of the minority carriers
in the active region of an LED are 1ns and 100ns, respectively, find the
internal quantum efficiency and the bulk recombination lifetime in the absence
of self absorption and recombination at the heterojuntion. [4+4]
5. (a) Why power bandwidth is an important parameter in an optical communication
system?
(b) Explain in detail the various factors which affects the performance of optical
source. [6+10]
6. (a) Describe with relevant diagram about the signal path through optical data link
via transmitter ,fiber and receiver giving the nature of the signal waveform.
[10]
(b) What is a bit period? The bit frequency of the link is 107Hz.On the average
and one error is encountered in a second, find the value of BER (Bit Error
Rate). [2+4]
1 of 2
Code No: NR410404 NR
7. (a) Explain about Wavelength Division Multiplexing and Demultiplexing techniques
with suitable diagrams. [4+4]
(b) Explain the following:
i. Source o/p pattern
ii. Power coupling calculation
iii. Power launching versus wave lens. [3+3+2]
8. (a) Explain about Adhesive splicing?
(b) Explain about Multiple splices? [8+8]
2 of 2
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