Download AKTU B-Tech 8th Sem 2018-19 NEC802 Optical Networks Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 8th Semester (Eight Semester) 2018-19 NEC802 Optical Networks Question Paper

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B.TECH.
(SEM VIII) THEORY EXAMINATION 2018-19
OPTICAL NETWORKS
T ime: 3 Hours T 0tal Marks: 100
Note: 1. Attempt all Sections. If require any missing data; then choose suitably.
SECTION A
1. Attempt all questions in brief. 2 x 10 = 20
a. Define Effective length of Fiber.
b. A step index multimode glass fiber has a core diameter of 65 um and cladding
refractive index of 1.45. Find the acceptance angle of fiber, if it has to maintain
limiting intermodal dispersion value of 10 ns/km.
c. Define Extinction ratio.
d. Explain how wave?length convertor can be realized with Four Wave Mixing
phenomenon.
e. Differentiate between connection?less and connection-oriented services with suitable
examples.
f. Compare different Optical Add-Drop Multiplexer architecture.
g. Compare revertive and nonrevertive protection scheme.
h. How the wavelength conversion reduces the blocking probability in the optical
network?
1. How tunable delay is used to achieve synchronization in the optical networks?
j. What is IP over WDM?
SECTION B
2. Attempt any three of the following: 10 x 3 = 30
a. Elaborate the advantages of Wave-length Division Multiplexing over Optical Time
Division Multiplexing.
b. Describe different parameters used to characterize the suitability of a switch for
optical networking applications.
c. Discuss various issues faced by PDH(plesiochr0nous digital hierarchy) technology
and how the SONET/SDH transmission technology solve these issues, how do we
?x 51.84 Mbps as the basic transmission rate of SONET/SDH.
d. Compare different optical protection schemes.
e. Elaborate the working Fiber to the Curb(FTTC), Why ring architecture is preferred in
optical networks over other architecture.
SECTION C
3. Attempt any one part of the following: 10 x 1 = 10
a. Explain different linear and non linear losses occur in optical fiber.
b. Explain, how Stimulated Raman Scattering can be used to extend the useable
bandwidth of single mode optical fiber from C(1530 nm to 1565 nm) band to
C+L(1530 nm to 1625 nm) band.
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4. Attempt any one part of the following: 10 x 1 = 10
a. Explain, the working principle of Acousto-Optic Tunable ?lter, also elaborate its
application as wavelength cross?connect.
b. Elaborate the principle of operation of optical coupler.
5. Attempt any one part of the following: 10 x 1 = 10
a. What are optical cross connects, elaborate several key features provided by optical
cross connects in optical networks?
b. Illustrate ATM reference model, also explain, by using different values of Payload
type and Cell Loss Priority bits of ATM cell header fields, how can we provide
different type services?
6. Attempt any one part of the following: 10 x 1 = 10
a. Explain, with suitable example, how the cost of optical network can be optimized
with the deployment of different optical network components.
b. Compare the different protection schemes in SONET/SDH network deployment.
7. Attempt any one part of the following: 10 x 1 = 10
a. Explain different functions performed by IP router.
b. Compare the bit interleaving and packet interleaving in optical time division
multiplexing.
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