Optical Fiber Communication Test Questions - Set 9

1)   In the dynamic response of Injection Laser Diode (ILD), the delay which is followed by ____ frequency damped oscillations give rise to the generation of relaxation oscillations.

a. Low
b. Medium
c. High
d. All of the above
Answer  Explanation 

ANSWER: High

Explanation:
No explanation is available for this question!


2)   The spectral response of an ideal photodetector depicts its efficiency as a function of _________

a. amplitude
b. frequency
c. period
d. wavelength
Answer  Explanation 

ANSWER: wavelength

Explanation:
No explanation is available for this question!


3)   According to frequency response of photo-detector, the modulation frequency at which the output current decreases to ________of peak value.

a. one-third
b. one-fourth
c. half
d. one-tenth
Answer  Explanation 

ANSWER: half

Explanation:
No explanation is available for this question!


4)   Which photodiodes are crucially applicable to overcome the bandwidth-quantum efficiency trade-off along with its resemblence to the pyramid structure?

a. Mushroom Waveguide Photodiode
b. Traveling Wave Photodiode
c. Resonant Cavity Photodiode
d. All of the above
Answer  Explanation 

ANSWER: Mushroom Waveguide Photodiode

Explanation:
No explanation is available for this question!


5)   When an optical signal is incident on a photo-detector, which noise originate/s due to statistical nature of production and collection of photoelectrons?

a. Dark Current Noise
b. Quantum Noise
c. Surface Leakage Current noise
d. All of the above
Answer  Explanation 

ANSWER: Quantum Noise

Explanation:
No explanation is available for this question!


6)   In an eye-diagram, digital signals with very bad interference resembles the shape of _____

a. circle
b. rectangle
c. triangle
d. straight line
Answer  Explanation 

ANSWER: straight line

Explanation:
No explanation is available for this question!


7)   On which factor/s do/does the response time of photodiode depend/s?

a. Diffusion time of photo carriers outside the depletion region
b. Diffusion time of photo carriers within the depletion region
c. RC time constant
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


8)   Which nature of charge carriers give rise to the current fluctuations thereby resulting into the generation of shot noise?

a. Continuous
b. Discrete
c. Sampled
d. All of the above
Answer  Explanation 

ANSWER: Discrete

Explanation:
No explanation is available for this question!


9)   Which among the following parameters is/are decided by the front-end of a receiver?

a. Sensitivity
b. Bandwidth
c. Both a and b
d. None of the above
Answer  Explanation 

ANSWER: Both a and b

Explanation:
No explanation is available for this question!


10)   In an optical network, increase in the number of lasers ________the bit rate.

a. Increases
b. Stabilizes
c. Decreases
d. None of the above
Answer  Explanation 

ANSWER: Increases

Explanation:
No explanation is available for this question!


11)   Which band/s specify/ies the operation range of Erbium doped fiber amplifier (EDFA)?

a. By O band
b. By C band
c. By S band
d. All of the above
Answer  Explanation 

ANSWER: By C band

Explanation:
No explanation is available for this question!


12)   Basically, solitons are pulses which propagates through the fiber without showing any variation in ______

a. Amplitude
b. Velocity
c. Shape
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


13)   Why is an electrical isolation required between several portions of an electronic circuit?

a. Provision of high voltage protection
b. Reduction in noise level
c. Both a & b
d. None of the above
Answer  Explanation 

ANSWER: Both a & b

Explanation:
No explanation is available for this question!


14)   For measuring the shape of input pulse in time-domain intermodal dispersion method, the test fiber is replaced by another fiber whose length is less than ___ of the test fiber.

a. 1%
b. 5%
c. 10%
d. 20%
Answer  Explanation 

ANSWER: 1%

Explanation:
No explanation is available for this question!


15)   In chromatic dispersion, which parameter for the modulation of the received signal is measured with the help of a vector voltmeter?

a. Amplitude
b. Frequency
c. Phase
d. Period
Answer  Explanation 

ANSWER: Phase

Explanation:
No explanation is available for this question!


16)   Which among the following stages is/are adopted in Splice Loss Experiment?

a. Translational
b. Rotational
c. Both a and b
d. None of the above
Answer  Explanation 

ANSWER: Both a and b

Explanation:
No explanation is available for this question!


17)   Which among the following misalignments give/gives rise to the occurrence of splice loss?

a. Longitudinal separation between the end-faces of fiber
b. Angular tilt between fiber ends
c. Transverse offset between fiber ends
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!