MCQ On Optical Fiber Part 2. This part has 10 Multiple Choice Questions on the topic of Optical Fiber.
MCQ On Optical Fiber Part 2
In Stimulated Emission, which among the following parameters of the generated photon is/are similar to the photon of the incident wave ??
a. Phase
b. Frequency
c. Polarization & direction of travel
d. All of the above
Consider a crystal of ruby laser whose length is 6 cm and the refractive index is 1.8, emits the wavelength of about 0.55 μm. What will be the value of a number of longitudinal modes ??
a. 3.9 x 105
b. 4.9 x 105
c. 5.6 x 105
d. 7.7 x 105
In a laser structure, the existence of standing waves is possible at frequencies for which the distance between the mirrors is an integral number of ________ ??
a. λ / 2
b. λ / 4
c. λ / 6
d. λ / 8
The small section of fiber that is coupled to the optical source is known as _________ ??
a. Flylead
b. Pigtail
c. Both a and b
d. None of the above
In the Lambertian output pattern of an LED, the source is ______ bright from all directions ??
a. Less
b. Equally
c. More
d. Unpredictably
MCQ On Optical Fiber Part 2
In pyroelectric photodetectors, the consequent increase in dielectric constant due to temperature variation by the photon absorption is generally measured as a change in _______ ??
a. resistance
b. inductance
c. admittance
d. capacitance
Which type of preamplifier plays a crucial role in reducing the effect of thermal noise ??
a. Low Impedance Pre-amplifier
b. High Impedance Preamplifier
c. Transimpedance Preamplifier
d. None of the above
In a high impedance preamplifier, how are the noise sources kept to a minimum level ??
a. By reducing dark current with proper selection of photodiode
b. By reducing thermal noise of biasing resistor
c. By using a high impedance amplifier
d. All of the above
Which among the following are the disadvantages of an optical feedback transimpedance receiver ??
A. Increase in receiver input capacitance
B. Increase in dark current
C. Decrease in receiver input capacitance
D. Decrease in dark current
a. A & B
b. C & D
c. A & D
d. B & C
Which category/ies of wavelength division multiplexer comprise/s two 3dB couplers where the splitting of an incident beam takes place into two fiber paths, followed by the recombination with the second 3-dB coupler ??
a. Interference filter-based devices
b. Angular dispersion-based devices
c. Mach-Zehnder Interferometers
d. All of the above
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