1) 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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Answer
Explanation
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ANSWER: Quantum Noise
Explanation:
No explanation is available for this question!
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2) 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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Answer
Explanation
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ANSWER: Mushroom Waveguide Photodiode
Explanation:
No explanation is available for this question!
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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
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Answer
Explanation
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ANSWER: half
Explanation:
No explanation is available for this question!
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4) 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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Answer
Explanation
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ANSWER: wavelength
Explanation:
No explanation is available for this question!
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5) In pyroelectric photodetectors, the consequent increase in dielectric constant due to temperature variation by the photon absorption, is generally measured as change in _______
a. resistance
b. inductance
c. admittance
d. capacitance
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Answer
Explanation
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ANSWER: capacitance
Explanation:
No explanation is available for this question!
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6) In Lambertian output pattern of LED, the source is ______ bright from all directions.
a. Less
b. Equally
c. More
d. Unpredictably
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Answer
Explanation
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ANSWER: Equally
Explanation:
No explanation is available for this question!
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7) The small section of fiber which is coupled to the optical source is known as _________
a. Flylead
b. Pigtail
c. Both a and b
d. None of the above
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Answer
Explanation
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ANSWER: Both a and b
Explanation:
No explanation is available for this question!
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8) For a photo-diode with responsivity of 0.50 A/W & optical power of about 12μW, what would be the value of generated photocurrent?
a. 3 μA
b. 6 μA
c. 9 μA
d. 12 μA
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Answer
Explanation
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ANSWER: 6 μA
Explanation:
No explanation is available for this question!
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9) Which among the following results in the removal of LED lens interface for achieving high coupling efficiency?
a. Spherical lens
b. Cylindrical lens
c. Integral lens LED
d. All of the above
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Answer
Explanation
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ANSWER: Integral lens LED
Explanation:
No explanation is available for this question!
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10) While coupling of LEDs with fiber, on which factor/s does the size of source and lighting angle generated within the semiconductor depend/s?
a. Geometry of die
b. Refractive index of semiconductor
c. Encapsulation Medium
d. All of the above
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Answer
Explanation
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ANSWER: All of the above
Explanation:
No explanation is available for this question!
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