Download PTU Fiber Optics Questions Question Bank

Download PTU (Punjab Technical University) Fiber Optics Questions Question Bank

FIBRE OPTICS

1. What do you mean by splicer and connector? Give one
example of each. (2) {JUN 15 [GNE]}
2. Why single mode fiber is preferred for long distance
communication? (2) {JUN 15 [GNE]}
3. Define and derive expression for numerical aperture. Hence
explain why numerical aperture is small for a graded index
fiber in comparison to an identical step index fiber. (4) {JUN
15 [GNE]}
4. Write names of various losses taking place in the optical
fiber. If the length of optical fiber is 2km and output power
is 1/100 of input power, then find fiber loss and attenuation
coefficient. (4) {JUN 15 [GNE]}
5. Why do we prefer small numerical aperture for long
distance communication? (2) {DEC 14 [GNE]}
6. Differentiate single mode and multimode fiber. (2) {DEC 14
[GNE]}
7. Define acceptance angle and numerical aperture and hence
derive mathematical relation between the two. (4) {JUN 14
[GNE]}
8. The core of a glass fiber has refractive index 1.5, while its
cladding is doped to give a fractional change in refractive
index equal to 0.005. Find (i) refractive index of clad (ii)
critical internal reflecting angle (iii) acceptance angle and (iv)
numerical aperture. (4) {JUN 14 [GNE]}
9. Why data carrying capacity of optical fiber is more than that
of radio waves? (2) {JUN 14 [GNE]}
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FIBRE OPTICS

1. What do you mean by splicer and connector? Give one
example of each. (2) {JUN 15 [GNE]}
2. Why single mode fiber is preferred for long distance
communication? (2) {JUN 15 [GNE]}
3. Define and derive expression for numerical aperture. Hence
explain why numerical aperture is small for a graded index
fiber in comparison to an identical step index fiber. (4) {JUN
15 [GNE]}
4. Write names of various losses taking place in the optical
fiber. If the length of optical fiber is 2km and output power
is 1/100 of input power, then find fiber loss and attenuation
coefficient. (4) {JUN 15 [GNE]}
5. Why do we prefer small numerical aperture for long
distance communication? (2) {DEC 14 [GNE]}
6. Differentiate single mode and multimode fiber. (2) {DEC 14
[GNE]}
7. Define acceptance angle and numerical aperture and hence
derive mathematical relation between the two. (4) {JUN 14
[GNE]}
8. The core of a glass fiber has refractive index 1.5, while its
cladding is doped to give a fractional change in refractive
index equal to 0.005. Find (i) refractive index of clad (ii)
critical internal reflecting angle (iii) acceptance angle and (iv)
numerical aperture. (4) {JUN 14 [GNE]}
9. Why data carrying capacity of optical fiber is more than that
of radio waves? (2) {JUN 14 [GNE]}
10. Find the numerical aperture of an optical fiber, whose core
and clad have refractive index respectively 1.46 & 1.45. (2)
{Dec 2013 [GNE]}
11. Define acceptance angle and derive mathematical relation
for it. (4) {Dec 2013 [GNE]}
12. Find the core radius necessary for SMF for propagation of
wavelength of 850nm and core and clad refractive index
respectively as 15.0 & 1.49. (4)
13. Specify an application where Laser and optical fiber are
used together. (2) {Jun 2013 [GNE]}
14. What do you mean by acceptance cone for an optical fiber?
(2) {Jun 2013 [GNE]}
15. A step index fiber with refractive index of 1.458 and
numerical aperture of 0.3 is to be used at 820nm. Find the
core radius if the normalized frequency is 75. (3) {Jun 2013
[GNE]}
16. What are splicers and couplers? (2) {Dec 2012 [GNE]}
17. What is the principle of optical fibre? Discuss various
applications of optical fibres. (4) {Dec 2012 [GNE]}
18. Calculate the numerical aperture and acceptance of an
optical fibre with 45 1
2
n & 50 1
1
n ? = ? = . (4) {Dec 2012 [GNE]}

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