M.Sc. Electronics (Semester II) (CBCS) Examination, 2017
OPTO ELECTRONICS
Day Date: Monday, 24-04-2017 Max. Marks: 70
Time: 10.30 AM to 01.00 PM
Instruction Answer five questions
Question 1 and 2 are compulsory
Attempt any Three from Q.3 to Q.7
Figures to the right indicate full marks.
Q.1 Choose correct answer: 08
In step fiber light source is used.
LASER LED Photodiode Both a and b
fibers RI of the core is uniform throughout.
Single mode step index Multimode step index
Graded index None of these
Total internal reflection occurs when
Angel of incidence critical angel
Critical angel angel of incidence
Angel incidence critical angel
Both a and c
gives the change in refractive index linearly proportional to
the square of the electric field.
Pockel's effect Faraday's effect
Kerr's effect None of these
use an electric arc to weld two fiber-optic cables together.
Mechanical splicing Fusion splices
Both a and b None of these
LASER is source of light
Coherent Natural
Incoherent Both a and b
material exhibits linear electro-optic effect
Crystalline silica Non- centro symmetric
Centro symmetric Both a and b
shifts the polarization direction of linearly of polarized light.
Half wave plate Quarter wave plate
Both a and b None of these.
Page 1 of 2
State True or False: 06
Optical fibers use visible spectral band.
Modal dispersion is reduced in multimode step index fiber.
For glass fabrication silicon dioxide is basic material.
Optically isotropic materials have the identical properties in all
directions.
The mechanical splices are used when splices need to be made
quickly and easily.
In surface emitting LED the active light emitting region oriented
parallel to the axis of the fiber.
Q.2 Attempt two short questions): 10
What is direct intensity modulation?
Give the difference between step index and graded index fiber.
Write a note on couplers.
What is electro optic modulator? 04
Q.3 What is Quarter waveplate? Explain its application for polarization of
light.
08
Write a note photodiode. 06
Q.4 Explain with necessary diagram, construction and working principle of
He-Ne laser.
08
Write a note on population inversion. 06
Q.5 What are the connectors? Explain with examples types of connectors. 08
Write a note on splicing. 06
Q.6 Describe in detail Magneto optic effect. 08
Write a note Edge emitting LED. 06
Q.7 Explain the types of fiber measurements. 08
Write a note on Acoustic optic modulator. 06