Electronics Engineering (Semester 7)
Total marks: 80
Total time: 3 Hours
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
Q1) Attempt the following Questions (any 4):
Define Snell’s law and NA, state the use of NA?
Compare step Index Fiber and graded index fiber?
General block Diagram of Optical communication with typical system of EDFA
Give Transmission characteristics of optical fiber -Attenuation and effect of attenuation
Draw Generic configuration of typical SONET or SDH Network and layering model for IP
Give the use of Generic optical Amplifier and draw the Optically Amplified Systems using EDFA
Explain the basic principle of operation of photo detector Explain the working of PIN Diode. List all the parameters that contribute to photo current gain of APD.
Describe the types of fiber .for each .type give typical core and cladding diameters sketch the refractive index profile.
Explain the Modified Chemical Vapor Deposition (MCVD) method of fiber fabrication?
Explain the different types of losses in optical fiber communication ,Give the various factors responsible for optical signal attenuation & Dispersion.
Derive the expression for NA acceptance angle cone and solid angle for step Index fiber
State the difference between couplets and connectors,
Given: Input Power= lm WLength = 1.3km Attenuation Coefficient, a= 0.6dB/kin
Find: Output Power
Compare LED sources S Type-E Type ,Define the quantum efficiency and
responsivity of photo detector, A light source generating an optical power output equal
to 1µw is coupled into an optical fiber with a cross sectional area larger than the active
area of the light source. Determine the power coupled into the fiber. $\theta$ equal to $15^0$
Explain with block schematic of optical fiber soliton transmission system with
optical soliton pulses
(i) collision of two solitons (ii) Four stable solitons at safe separation distance.
Explain Network Topologies used in SONET/SDH. Give the details of basic
connection used with respect to Bus, Ring, Star Topologies.
Describe the structure and operation of OTDR. Explain the method of dispersion
measurement of OTDR
Explain the term protocol and internet protocol (IP), using OSI reference model
discuss implementation aspect of the (i) SONET (ii) DWDM
Explain the Basic PON Architecture? Write note on IP over DWDM
Q6) Write a short notes on: (Any four)
Optical liber connectors & splicer
largest -Distance power Budget
Optical safety &Service Interface
Optical Switches &Optical Burst Switching
OADM Add/Drop Multiplexing & Typical WDM link.