Optical Communication Mock Test 5

10%

Question 1 of 10

1. In optical fiber communication, the electrical signal dropping to half its constant value due to modulated portion of optical signal corresponds to _______

3 dB

5 dB

6 dB

4 dB

Question 1 of 10

Question 2 of 10

2. For particular materials with smaller bandgap energies operating in _____________ wavelength, the linewidth tends to ______________

1.1 to 1.7 μm, increase

2.1 to 2.75 μm, increase

3.5 to 6 μm, decrease

2.1 to 3.6 μm, decrease

Question 2 of 10

Question 3 of 10

3. Mesa structured SLEDs are used ____________

To reduce radiance

To increase radiance

To increase current spreading

To reduce current spreading

Question 3 of 10

Question 4 of 10

4. ____________ are widely used in first generation systems of optical fiber communication.

p-n diodes

Silicon photodiodes

4-alloys

3-alloys

Question 4 of 10

Question 5 of 10

5. Which of the following detector is fabricated from semiconductor alloys?

Photoemission detectors

p-i-n detector

Photodiodes

Photoconductive detector

Question 5 of 10

Question 6 of 10

6. The amount of radiance in planer type of LED structures is ____________

Zero

Low

Negligible

High

Question 6 of 10

Question 7 of 10

7. Determine velocity of electron if drift time is 2×10^-10s and intrinsic region width of 25×10^-6μm.

12.5×10⁴

13.5×10⁴

11.5×10⁴

14.5×10⁴

Question 7 of 10

Question 8 of 10

8. Determine Responsivity of photodiode having o/p power of 3.55 μm and photo current of 2.9 μm.

0.451

0.816

0.982

0.367

Question 8 of 10

Question 9 of 10

9. The hole concentration in extrinsic materials is _________ electron concentration.

lesser than

equal to

negligible difference with

much greater than

Question 9 of 10

Question 10 of 10

10. Silicon photodiodes provide high shunt conductance.

True

False

Question 10 of 10