Deemed University 2009 A.M.I.E.T.E Electronics & Communication Engineering Opto electronics and optical communication – et (old scheme) - Question Paper

AMIETE – ET (OLD SCHEME)

Code: AE24 Subject: OPTO ELECTRONICS AND
OPTICAL COMMUNICATION
Time: three Hours Max. Marks: 100

NOTE: There are nine ques. in all.
· ques. one is compulsory and carries 20 marks. ans to Q. 1. must be written in the space given for it in the ans book supplied and nowhere else.
· Out of the remaining 8 ques. ans any 5 ques.. every ques. carries 16 marks.
· Any needed data not explicitly given, may be suitably presumed and said.

Q.1 select the accurate or the best option in the following: (2 10)

a. A glass fiber has refractive indices of 1.5 and of 1. Assuming . The multipath time dispersion will be

(A) 2.5 ns/m. (B) .
(C) . (D) .

b. As a outcome of reflections from a plane conducting wall, electromagnetic waves acquire an apparent velocity greater than the velocity of light in space. This is called

(A) velocity of propagation. (B) normal velocity.
(C) group velocity. (D) phase velocity.

c. A certain fiber has refractive index of clad and that of
core . Its numerical aperture will be

(A) 0.8575. (B) 0.9260.
(C) 0.3500. (D) 0.1585.

d. A single fiber can handle as many voice channel as

(A) a pair of copper conductors. (B) a 500-pair cable.
(C) a 1500-pair cable. (D) a 1000-pair cable.

e. The term power budgeting refers to

(A) The cost of cable, connectors, equipment and installation.
(B) The loss of power due to defective component.
(C) The total power available minus the attenuation losses.
(D) The comparative costs of fiber and copper installations.

f. The direct modulation rate of laser diodes depends on

(A) spontaneous carrier lifetime.

Earning:   Approval pending.