1) If a noisy channel has a bandwidth of 4 MHz with signal to noise ratio of about 1, what would be the maximum capacity of the channel?
a. 2 Mb/sec
b. 4 Mb/sec
c. 6 Mb/sec
d. 8 Mb/sec
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2) In the structure of fiber optic cable, the refractive index of core is always _______the refractive index of cladding.
a. Less than
b. Equal to
c. Greater than
d. None of the above
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3) The order of mode is equal to the number of field____ across the guide.
a. Zeros
b. Poles
c. Ones
d. All of the above
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4) Which among the following represents the lateral shift of a light beam on reflection at a dielectric interface?
a. Doppler's Shift
b. Goos-Haenchen's Shift
c. Frequency Shift
d. Phase Shift
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5) Why are plastic clad silica fiber optic cables not used widely?
a. Difficulty in connector application due to excessive plasticity in cladding
b. Difficulty in bonding
c. Insolubility in organic solvents
d. All of the above
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6) In cables, water is prevented from filling the spaces with __________resistant compounds.
a. moisture
b. pressure
c. temperature
d. stress
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7) Which reason/s is/are responsible for the occurrence of non-linear Cross Phase Modulation (XPM)?
a. Difference in transmission phase of peak pulse & leading or trailing edges of pulse
b. Third-order optical non-linearity
c. Intensity dependence of refractive index
d. All of the above
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8) What is/ are the consequence/s of Self Phase Modulation in non-linear optics?
a. Modification in pulse spectrum
b. Limited transmission rate
c. Dispersion effect
d. All of the above
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9) Which type of fiber-optic coupler causes the distribution of an optical power from more than two input ports among the several output ports?
a. Star Coupler
b. Tree Coupler
c. X Coupler
d. All of the above
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10) Which optical devices are adopted or applicable for routing signals from one waveguide to another?
a. Optical Combiner
b. Optical Splitter
c. Optical Coupler
d. None of the above
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11) Which among the following characteristics of Laser light specifies the precise movement of all individual light waves together through time and space?
a. Monochromatic
b. Directional
c. Coherent
d. Brightness
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12) Which modes are acknowledged due to their association with electromagnetic field and beam profile in the direction perpendicular to the plane of pn junction?
a. Longitudinal Modes
b. Transverse Modes
c. Lateral Modes
d. All of the above
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13) Which type of injection laser involves the use of geometry for fabrication of the multimode injection laser with a single or small number of lateral modes?
a. Gain guided laser
b. Index guided laser
c. Quantum well laser
d. Quantum dot laser
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14) 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
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15) The spectral response of an ideal photodetector depicts its efficiency as a function of _________
a. amplitude
b. frequency
c. period
d. wavelength
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16) 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
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17) 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
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18) 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
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19) In an eye-diagram, digital signals with very bad interference resembles the shape of _____
a. circle
b. rectangle
c. triangle
d. straight line
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20) 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
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21) 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
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22) 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
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23) In an optical network, increase in the number of lasers ________the bit rate.
a. Increases
b. Stabilizes
c. Decreases
d. None of the above
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24) 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
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25) 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
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26) 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
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27) 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%
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28) 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
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29) 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
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30) 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
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