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Posted By: kondapalli Member Level: Gold Posted Date: 05 Jun 2008
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2007 Jawaharlal Nehru Technological University B.Tech Electronics & Communications Engineering OPTICAL COMMUNICATION setno2 Question paper
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1. (a) List out the advantages and disadvantages of optical fiber communication.
[5+3]
(b) Distinguish between optical fiber communication system and conventional
communication system. [4+4]
2. (a) Derive an expression for power flow in Graded Index fiber. [6]
(b) Determine the normalized frequency at 820nm for step index fiber having a
25µ metres core radius, n1=1.48 n2=1.46.
i. How many modes propagate in the fiber at 820nm and 1550 nm. [5+5]
3. (a) Derive the expression for the waveguide dispersion also find the relationship
between V and ß. [7+3]
(b) A single mode fiber operating at the wave length of 1.3µm is found to have
a total material dispersion of 2.81ns , and a total waveguide dispersion of
0.495ns Determine the received pulse width and approximate bit-rate of the
fiber if the transmitted pulse has a width of 0.5ns. [6]
4. (a) Draw the schematic of edge emitting double hetro junction LED and explain
its working in detail. [3+5]
(b) If the radiative and non radiative recombination lifetimes of the minority car-
riers in the active region of an LED are 25ns 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) Draw the schematic of Fabry Perot Resonator Cavity for a laser diode and
explain how the optical radiations are generated. [3+7]
(b) Draw the LASER diode characteristics. [6]
6. (a) What are the requirements of an optical receiver? Using a flow chart explain
the receiver design. [4+4]
(b) Derive an expression for receiver sensitivity. [8]
7. (a) Describe with diagram to explain the operation of a unidirectional WDM
system.
(b) Discuss about a bidirectional WDM system. [8+8]
8. (a) Explain about losses in End seperation, connecting different fibers when join-
ing two fibers? [8]
(b) Explain about fiber end face preparation? [4+4]
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